src/backends/reference/RefLayerSupport.cpp

//
// Copyright © 2017-2024 Arm Ltd and Contributors. All rights reserved.
// SPDX-License-Identifier: MIT
//

#include "RefLayerSupport.hpp"

#include <armnn/TypesUtils.hpp>
#include <armnn/Types.hpp>
#include <armnn/utility/IgnoreUnused.hpp>
#include <armnn/utility/NumericCast.hpp>
#include <armnn/utility/PolymorphicDowncast.hpp>

#include <LayerSupportCommon.hpp>
#include <backendsCommon/LayerSupportRules.hpp>

#include <array>
#include <vector>

namespace armnn
{

namespace
{

template<typename Float32Func, typename Uint8Func, typename ... Params>
bool IsSupportedForDataTypeRef(Optional<std::string&> reasonIfUnsupported,
                               DataType dataType,
                               Float32Func floatFuncPtr,
                               Uint8Func uint8FuncPtr,
                               Params&&... params)
{
    return IsSupportedForDataTypeGeneric(reasonIfUnsupported,
                                         dataType,
                                         &FalseFunc<Params...>,
                                         floatFuncPtr,
                                         uint8FuncPtr,
                                         &FalseFunc<Params...>,
                                         &FalseFunc<Params...>,
                                         std::forward<Params>(params)...);
}

} // anonymous namespace

namespace
{

std::string CreateIncorrectDimensionsErrorMsg(unsigned int expected,
                                              unsigned int actual,
                                              std::string& layerStr,
                                              std::string& tensorName)
{
    std::string errorMsg = "Reference " + layerStr + ": Expected " + std::to_string(expected) + " dimensions but got" +
                           " " + std::to_string(actual) + " dimensions instead, for the '" + tensorName + "' tensor.";

    return errorMsg;
}

} // anonymous namespace

bool RefLayerSupport::IsLayerSupported(const LayerType& type,
                                       const std::vector<TensorInfo>& infos,
                                       const BaseDescriptor& descriptor,
                                       const Optional<LstmInputParamsInfo>& lstmParamsInfo,
                                       const Optional<QuantizedLstmInputParamsInfo>& quantizedLstmInputParamsInfo,
                                       Optional<std::string&> reasonIfUnsupported) const
{
    switch (type)
    {
        case LayerType::Activation:
            return IsActivationSupported(infos[0],
                                         infos[1],
                                         *(PolymorphicDowncast<const ActivationDescriptor*>(&descriptor)),
                                         reasonIfUnsupported);
        case LayerType::Addition:
            return IsAdditionSupported(infos[0], infos[1], infos[2], reasonIfUnsupported);
        case LayerType::ArgMinMax:
            return IsArgMinMaxSupported(infos[0],
                                        infos[1],
                                        *(PolymorphicDowncast<const ArgMinMaxDescriptor*>(&descriptor)),
                                        reasonIfUnsupported);
        case LayerType::BatchMatMul:
            return IsBatchMatMulSupported(infos[0],
                                          infos[1],
                                          infos[2],
                                          *(PolymorphicDowncast<const BatchMatMulDescriptor*>(&descriptor)),
                                          reasonIfUnsupported);
        case LayerType::BatchNormalization:
            return IsBatchNormalizationSupported(infos[0],
                                                 infos[1],
                                                 infos[2],
                                                 infos[3],
                                                 infos[4],
                                                 infos[5],
                                                 *(PolymorphicDowncast<const BatchNormalizationDescriptor*>
                                                     (&descriptor)),
                                                 reasonIfUnsupported);
        case LayerType::BatchToSpaceNd:
            return IsBatchToSpaceNdSupported(infos[0],
                                             infos[1],
                                             *(PolymorphicDowncast<const BatchToSpaceNdDescriptor*>(&descriptor)),
                                             reasonIfUnsupported);
        case LayerType::BroadcastTo:
            return IsBroadcastToSupported(infos[0],
                                          infos[1],
                                          *(PolymorphicDowncast<const BroadcastToDescriptor*>(&descriptor)),
                                          reasonIfUnsupported);
        case LayerType::Comparison:
            return IsComparisonSupported(infos[0],
                                         infos[1],
                                         infos[2],
                                         *(PolymorphicDowncast<const ComparisonDescriptor*>(&descriptor)),
                                         reasonIfUnsupported);
        case LayerType::Concat:
        {
            std::vector<const TensorInfo*> inputInfos;
            for (uint32_t i = 0; i < (infos.size() - 1); i++)
            {
                inputInfos.push_back(&infos[i]);
            }
            return IsConcatSupported(inputInfos,
                                     infos[infos.size() - 1],
                                     *(PolymorphicDowncast<const OriginsDescriptor*>(&descriptor)),
                                     reasonIfUnsupported);
        }
        case LayerType::Constant:
            return IsConstantSupported(infos[0], reasonIfUnsupported);
        case LayerType::ConvertFp16ToFp32:
            return IsConvertFp16ToFp32Supported(infos[0], infos[1], reasonIfUnsupported);
        case LayerType::ConvertFp32ToFp16:
            return IsConvertFp32ToFp16Supported(infos[0], infos[1], reasonIfUnsupported);
        case LayerType::Convolution2d:
        {
            if (infos.size() != 4)
            {
                throw InvalidArgumentException("Invalid number of Convolution2d TensorInfos. "
                                               "TensorInfos should be of format: {input, output, weights, biases}.");
            }

            auto desc = *(PolymorphicDowncast<const Convolution2dDescriptor*>(&descriptor));
            if (infos[3] == TensorInfo())
            {
                return IsConvolution2dSupported(infos[0],
                                                infos[1],
                                                desc,
                                                infos[2],
                                                EmptyOptional(),
                                                reasonIfUnsupported);
            }
            else
            {
                return IsConvolution2dSupported(infos[0],
                                                infos[1],
                                                desc,
                                                infos[2],
                                                infos[3],
                                                reasonIfUnsupported);
            }
        }
        case LayerType::DepthToSpace:
            return IsDepthToSpaceSupported(infos[0],
                                           infos[1],
                                           *(PolymorphicDowncast<const DepthToSpaceDescriptor*>(&descriptor)),
                                           reasonIfUnsupported);
        case LayerType::DepthwiseConvolution2d:
        {
            if (infos.size() != 4)
            {
                throw InvalidArgumentException("Invalid number of DepthwiseConvolution2d TensorInfos. "
                                               "TensorInfos should be of format: {input, output, weights, biases}.");
            }

            auto desc = *(PolymorphicDowncast<const DepthwiseConvolution2dDescriptor*>(&descriptor));
            if (infos[3] == TensorInfo())
            {
                return IsDepthwiseConvolutionSupported(infos[0],
                                                       infos[1],
                                                       desc,
                                                       infos[2],
                                                       EmptyOptional(),
                                                       reasonIfUnsupported);
            }
            else
            {
                return IsDepthwiseConvolutionSupported(infos[0],
                                                       infos[1],
                                                       desc,
                                                       infos[2],
                                                       infos[3],
                                                       reasonIfUnsupported);
            }
        }
        case LayerType::Dequantize:
            return IsDequantizeSupported(infos[0], infos[1], reasonIfUnsupported);
        case LayerType::Division:
            return IsDivisionSupported(infos[0], infos[1], infos[2], reasonIfUnsupported);
        case LayerType::ElementwiseBinary:
        {
            std::array<DataType, 7> supportedTypes =
                    {
                            DataType::Float32,
                            DataType::Float16,
                            DataType::QAsymmS8,
                            DataType::QAsymmU8,
                            DataType::QSymmS16,
                            DataType::Signed32
                    };

            bool supported = true;
            supported &= CheckSupportRule(TypeAnyOf(infos[0], supportedTypes), reasonIfUnsupported,
                                          "Reference elementwise unary: input type not supported");

            supported &= CheckSupportRule(TypeAnyOf(infos[1], supportedTypes), reasonIfUnsupported,
                                          "Reference elementwise unary: input type not supported");

            supported &= CheckSupportRule(TypeAnyOf(infos[2], supportedTypes), reasonIfUnsupported,
                                          "Reference elementwise unary: output type not supported");

            supported &= CheckSupportRule(TypesAreEqual(infos[0], infos[1]), reasonIfUnsupported,
                                          "Reference elementwise unary: input types not matching");

            supported &= CheckSupportRule(TypesAreEqual(infos[0], infos[2]), reasonIfUnsupported,
                                          "Reference elementwise unary: input and output types not matching");

            return supported;
        }
        case LayerType::ElementwiseUnary:
            return IsElementwiseUnarySupported(infos[0],
                                               infos[1],
                                               *(PolymorphicDowncast<const ElementwiseUnaryDescriptor*>(&descriptor)),
                                               reasonIfUnsupported);
        case LayerType::Fill:
            return IsFillSupported(infos[0],
                                   infos[1],
                                   *(PolymorphicDowncast<const FillDescriptor*>(&descriptor)),
                                   reasonIfUnsupported);
        case LayerType::Floor:
            return IsFloorSupported(infos[0], infos[1], reasonIfUnsupported);
        case LayerType::FullyConnected:
            return IsFullyConnectedSupported(infos[0],
                                             infos[1],
                                             infos[2],
                                             infos[3],
                                             *(PolymorphicDowncast<const FullyConnectedDescriptor*>(&descriptor)),
                                             reasonIfUnsupported);
        case LayerType::Gather:
            return IsGatherSupported(infos[0],
                                     infos[1],
                                     infos[2],
                                     *(PolymorphicDowncast<const GatherDescriptor*>(&descriptor)),
                                     reasonIfUnsupported);
        case LayerType::GatherNd:
            return IsGatherNdSupported(infos[0],
                                       infos[1],
                                       infos[2],
                                       reasonIfUnsupported);
        case LayerType::Input:
            return IsInputSupported(infos[0], reasonIfUnsupported);
        case LayerType::InstanceNormalization:
            return IsInstanceNormalizationSupported(infos[0],
                                                    infos[1],
                                                    *(PolymorphicDowncast<const InstanceNormalizationDescriptor*>
                                                        (&descriptor)),
                                                    reasonIfUnsupported);
        case LayerType::L2Normalization:
            return IsL2NormalizationSupported(infos[0],
                                              infos[1],
                                              *(PolymorphicDowncast<const L2NormalizationDescriptor*>(&descriptor)),
                                              reasonIfUnsupported);
        case LayerType::LogicalBinary:
            return IsLogicalBinarySupported(infos[0],
                                            infos[1],
                                            infos[2],
                                            *(PolymorphicDowncast<const LogicalBinaryDescriptor*>(&descriptor)),
                                            reasonIfUnsupported);
        case LayerType::LogSoftmax:
            return IsLogSoftmaxSupported(infos[0],
                                         infos[1],
                                         *(PolymorphicDowncast<const LogSoftmaxDescriptor*>(&descriptor)),
                                         reasonIfUnsupported);
        case LayerType::Lstm:
            return IsLstmSupported(infos[0],
                                   infos[1],
                                   infos[2],
                                   infos[3],
                                   infos[4],
                                   infos[5],
                                   infos[6],
                                   *(PolymorphicDowncast<const LstmDescriptor*>(&descriptor)),
                                   lstmParamsInfo.value(),
                                   reasonIfUnsupported);
        case LayerType::QLstm:
            return IsQLstmSupported(infos[0],
                                    infos[1],
                                    infos[2],
                                    infos[3],
                                    infos[4],
                                    infos[5],
                                    *(PolymorphicDowncast<const QLstmDescriptor*>(&descriptor)),
                                    lstmParamsInfo.value(),
                                    reasonIfUnsupported);
        case LayerType::Maximum:
            return IsMaximumSupported(infos[0], infos[1], infos[2], reasonIfUnsupported);
        case LayerType::Mean:
            return IsMeanSupported(infos[0],
                                   infos[1],
                                   *(PolymorphicDowncast<const MeanDescriptor*>(&descriptor)),
                                   reasonIfUnsupported);
        case LayerType::Minimum:
            return IsMinimumSupported(infos[0], infos[1], infos[2], reasonIfUnsupported);
        case LayerType::Multiplication:
            return IsMultiplicationSupported(infos[0], infos[1], infos[2], reasonIfUnsupported);
        case LayerType::Normalization:
            return IsNormalizationSupported(infos[0],
                                            infos[1],
                                            *(PolymorphicDowncast<const NormalizationDescriptor*>(&descriptor)),
                                            reasonIfUnsupported);
        case LayerType::Output:
            return IsOutputSupported(infos[0], reasonIfUnsupported);
        case LayerType::Pad:
            return IsPadSupported(infos[0],
                                  infos[1],
                                  *(PolymorphicDowncast<const PadDescriptor*>(&descriptor)),
                                  reasonIfUnsupported);
        case LayerType::Permute:
            return IsPermuteSupported(infos[0],
                                      infos[1],
                                      *(PolymorphicDowncast<const PermuteDescriptor*>(&descriptor)),
                                      reasonIfUnsupported);
        case LayerType::Pooling2d:
            return IsPooling2dSupported(infos[0],
                                        infos[1],
                                        *(PolymorphicDowncast<const Pooling2dDescriptor*>(&descriptor)),
                                        reasonIfUnsupported);
        case LayerType::Prelu:
            return IsPreluSupported(infos[0], infos[1], infos[2], reasonIfUnsupported);
        case LayerType::Quantize:
            return IsQuantizeSupported(infos[0], infos[1], reasonIfUnsupported);
        case LayerType::Reshape:
            return IsReshapeSupported(infos[0],
                                      infos[1],
                                      *(PolymorphicDowncast<const ReshapeDescriptor*>(&descriptor)),
                                      reasonIfUnsupported);
        case LayerType::Resize:
            return IsResizeSupported(infos[0],
                                     infos[1],
                                     *(PolymorphicDowncast<const ResizeDescriptor*>(&descriptor)),
                                     reasonIfUnsupported);
        case LayerType::ReverseV2:
            return IsReverseV2Supported(infos[0],
                                        infos[1],
                                        infos[2],
                                        reasonIfUnsupported);
        case LayerType::Reduce:
            return IsReduceSupported(infos[0],
                                     infos[1],
                                     *(PolymorphicDowncast<const ReduceDescriptor*>(&descriptor)),
                                     reasonIfUnsupported);
        case LayerType::ScatterNd:
            return IsScatterNdSupported(infos[0],
                                        infos[1],
                                        infos[2],
                                        infos[3],
                                        *(PolymorphicDowncast<const ScatterNdDescriptor*>(&descriptor)),
                                        reasonIfUnsupported);
        case LayerType::Slice:
            return IsSliceSupported(infos[0],
                                    infos[1],
                                    *(PolymorphicDowncast<const SliceDescriptor*>(&descriptor)),
                                    reasonIfUnsupported);
        case LayerType::Softmax:
            return IsSoftmaxSupported(infos[0],
                                      infos[1],
                                      *(PolymorphicDowncast<const SoftmaxDescriptor*>(&descriptor)),
                                      reasonIfUnsupported);
        case LayerType::SpaceToBatchNd:
            return IsSpaceToBatchNdSupported(infos[0],
                                             infos[1],
                                             *(PolymorphicDowncast<const SpaceToBatchNdDescriptor*>(&descriptor)),
                                             reasonIfUnsupported);
        case LayerType::SpaceToDepth:
            return IsSpaceToDepthSupported(infos[0],
                                           infos[1],
                                           *(PolymorphicDowncast<const SpaceToDepthDescriptor*>(&descriptor)),
                                           reasonIfUnsupported);
        case LayerType::Splitter:
        {
            std::vector<TensorInfo> outputInfos;
            for (uint32_t i = 1; i < infos.size(); i++)
            {
                outputInfos.push_back(infos[i]);
            }
            return IsSplitterSupported(infos[0],
                                       {outputInfos.begin(), outputInfos.end()},
                                       *(PolymorphicDowncast<const ViewsDescriptor*>(&descriptor)),
                                       reasonIfUnsupported);
        }
        case LayerType::Stack:
        {
            std::vector<const TensorInfo*> inputInfos;
            for (uint32_t i = 0; i < infos.size() - 1; i++)
            {
                inputInfos.push_back(&infos[i]);
            }
            return IsStackSupported(inputInfos,
                                    infos[infos.size() - 1],
                                    *(PolymorphicDowncast<const StackDescriptor*>(&descriptor)),
                                    reasonIfUnsupported);
        }
        case LayerType::StridedSlice:
            return IsStridedSliceSupported(infos[0],
                                           infos[1],
                                           *(PolymorphicDowncast<const StridedSliceDescriptor*>(&descriptor)),
                                           reasonIfUnsupported);
        case LayerType::Subtraction:
            return IsSubtractionSupported(infos[0], infos[1], infos[2], reasonIfUnsupported);
        case LayerType::Tile:
            return IsTileSupported(infos[0],
                                   infos[1],
                                   *(PolymorphicDowncast<const TileDescriptor*>(&descriptor)),
                                   reasonIfUnsupported);
        case LayerType::Transpose:
            return IsTransposeSupported(infos[0],
                                        infos[1],
                                        *(PolymorphicDowncast<const TransposeDescriptor*>(&descriptor)),
                                        reasonIfUnsupported);
        case LayerType::TransposeConvolution2d:
        {
            if (infos.size() != 4)
            {
                throw InvalidArgumentException("Invalid number of TransposeConvolution2d TensorInfos. "
                                               "TensorInfos should be of format: {input, output, weights, biases}.");
            }

            auto desc = *(PolymorphicDowncast<const TransposeConvolution2dDescriptor*>(&descriptor));
            if (infos[3] == TensorInfo())
            {
                return IsTransposeConvolution2dSupported(infos[0],
                                                         infos[1],
                                                         desc,
                                                         infos[2],
                                                         EmptyOptional(),
                                                         reasonIfUnsupported);
            }
            else
            {
                return IsTransposeConvolution2dSupported(infos[0],
                                                         infos[1],
                                                         desc,
                                                         infos[2],
                                                         infos[3],
                                                         reasonIfUnsupported);
            }
        }
        case LayerType::Cast:
            return IsCastSupported(infos[0], infos[1], reasonIfUnsupported);
        case LayerType::ChannelShuffle:
            return IsChannelShuffleSupported(infos[0],
                                             infos[1],
                                             *(PolymorphicDowncast<const ChannelShuffleDescriptor*>(&descriptor)),
                                             reasonIfUnsupported);
        case LayerType::Convolution3d:
        {
            if (infos.size() != 4)
            {
                throw InvalidArgumentException("Invalid number of Convolution3d TensorInfos. "
                                               "TensorInfos should be of format: {input, output, weights, biases}.");
            }

            auto desc = *(PolymorphicDowncast<const Convolution3dDescriptor*>(&descriptor));
            if (infos[3] == TensorInfo())
            {
                return IsConvolution3dSupported(infos[0],
                                                infos[1],
                                                desc,
                                                infos[2],
                                                EmptyOptional(),
                                                reasonIfUnsupported);
            }
            else
            {
                return IsConvolution3dSupported(infos[0],
                                                infos[1],
                                                desc,
                                                infos[2],
                                                infos[3],
                                                reasonIfUnsupported);
            }
        }
        case LayerType::Debug:
            return IsDebugSupported(infos[0], infos[1], reasonIfUnsupported);
        case LayerType::DetectionPostProcess:
            return IsDetectionPostProcessSupported(infos[0],
                                                   infos[1],
                                                   infos[2],
                                                   infos[3],
                                                   infos[4],
                                                   infos[5],
                                                   infos[6],
                                                   *(PolymorphicDowncast<const DetectionPostProcessDescriptor*>
                                                       (&descriptor)),
                                                   reasonIfUnsupported);
        case LayerType::FakeQuantization:
            return IsFakeQuantizationSupported(infos[0],
                                               *(PolymorphicDowncast<const FakeQuantizationDescriptor*>(&descriptor)),
                                               reasonIfUnsupported);
        case LayerType::MemCopy:
            return IsMemCopySupported(infos[0], infos[1], reasonIfUnsupported);
        case LayerType::Rank:
            return IsRankSupported(infos[0], infos[1], reasonIfUnsupported);
        case LayerType::Shape:
            return IsShapeSupported(infos[0], infos[1], reasonIfUnsupported);
        case LayerType::UnidirectionalSequenceLstm:
        {
            if (infos.size() != 6)
            {
                throw InvalidArgumentException("Invalid number of UnidirectionalSequenceLstm TensorInfos. TensorInfos "
                                               "should be of format: {input, outputStateIn, cellStateIn, "
                                               "hiddenStateOutputVal, cellStateOutputVal, output}");
            }
            auto desc = *(PolymorphicDowncast<const UnidirectionalSequenceLstmDescriptor*>(&descriptor));
            return IsUnidirectionalSequenceLstmSupported(infos[0],
                                                         infos[1],
                                                         infos[2],
                                                         infos[3],
                                                         infos[4],
                                                         infos[5],
                                                         desc,
                                                         lstmParamsInfo.value(),
                                                         reasonIfUnsupported);
        }
        case LayerType::Pooling3d:
            return IsPooling3dSupported(infos[0],
                                        infos[1],
                                        *(PolymorphicDowncast<const Pooling3dDescriptor*>(&descriptor)),
                                        reasonIfUnsupported);
        case LayerType::Map:
            return true;
        case LayerType::Unmap:
            return true;
        case LayerType::MemImport:
            return LayerSupportBase::IsMemImportSupported(infos[0], infos[1], reasonIfUnsupported);
        case LayerType::Merge:
            return LayerSupportBase::IsMergeSupported(infos[0], infos[1], infos[2], reasonIfUnsupported);
        case LayerType::QuantizedLstm:
            return LayerSupportBase::IsQuantizedLstmSupported(infos[0],
                                                              infos[1],
                                                              infos[2],
                                                              infos[3],
                                                              infos[4],
                                                              quantizedLstmInputParamsInfo.value(),
                                                              reasonIfUnsupported);
        default:
            // layers not supported in reference by default:
            // precompiled, standin, switch, fused
            return false;
    }
}

bool RefLayerSupport::IsActivationSupported(const TensorInfo& input,
                                            const TensorInfo& output,
                                            const ActivationDescriptor& descriptor,
                                            Optional<std::string&> reasonIfUnsupported) const
{
   bool supported = true;

    // Define supported types.
    std::array<DataType,6> supportedTypes = {
        DataType::Float32,
        DataType::Float16,
        DataType::QAsymmS8,
        DataType::QAsymmU8,
        DataType::QSymmS16
    };

    supported &= CheckSupportRule(TypeAnyOf(input, supportedTypes), reasonIfUnsupported,
                                  "Reference activation: input type not supported.");

    supported &= CheckSupportRule(TypeAnyOf(output, supportedTypes), reasonIfUnsupported,
                                  "Reference activation: output type not supported.");

    supported &= CheckSupportRule(TypesAreEqual(input, output), reasonIfUnsupported,
                                  "Reference activation: input and output types mismatched.");

    supported &= CheckSupportRule(ShapesAreSameRank(input, output), reasonIfUnsupported,
                                  "Reference activation: input and output shapes are of different rank.");


    struct ActivationFunctionSupported : public Rule
    {
        ActivationFunctionSupported(const ActivationDescriptor& desc)
        {
            switch(desc.m_Function)
            {
                case ActivationFunction::Abs:
                case ActivationFunction::BoundedReLu:
                case ActivationFunction::Elu:
                case ActivationFunction::Gelu:
                case ActivationFunction::HardSwish:
                case ActivationFunction::LeakyReLu:
                case ActivationFunction::Linear:
                case ActivationFunction::ReLu:
                case ActivationFunction::Sigmoid:
                case ActivationFunction::SoftReLu:
                case ActivationFunction::Sqrt:
                case ActivationFunction::Square:
                case ActivationFunction::TanH:
                {
                    m_Res = true;
                    break;
                }
                default:
                {
                    m_Res = false;
                    break;
                }
            }
        }
    };

    // Function is supported
    supported &= CheckSupportRule(ActivationFunctionSupported(descriptor), reasonIfUnsupported,
                                  "Reference activation: function not supported.");

    return supported;
}

bool RefLayerSupport::IsAdditionSupported(const TensorInfo& input0,
                                          const TensorInfo& input1,
                                          const TensorInfo& output,
                                          Optional<std::string&> reasonIfUnsupported) const
{
    bool supported = true;

    std::array<DataType,7> supportedTypes = {
        DataType::Float32,
        DataType::Float16,
        DataType::QAsymmS8,
        DataType::QAsymmU8,
        DataType::QSymmS16,
        DataType::Signed32
    };

    supported &= CheckSupportRule(TypeAnyOf(input0, supportedTypes), reasonIfUnsupported,
                                  "Reference addition: input 0 is not a supported type.");

    supported &= CheckSupportRule(TypeAnyOf(input1, supportedTypes), reasonIfUnsupported,
                                  "Reference addition: input 1 is not a supported type.");

    supported &= CheckSupportRule(TypeAnyOf(output, supportedTypes), reasonIfUnsupported,
                                  "Reference addition: output is not a supported type.");

    supported &= CheckSupportRule(TypesAreEqual(input0, input1), reasonIfUnsupported,
                                  "Reference addition: input 0 and Input 1 types are mismatched");

    supported &= CheckSupportRule(TypesAreEqual(input0, output), reasonIfUnsupported,
                                  "Reference addition: input and output types are mismatched");

    supported &= CheckSupportRule(ShapesAreBroadcastCompatible(input0, input1, output), reasonIfUnsupported,
                                  "Reference addition: shapes are not suitable for implicit broadcast.");

    return supported;
}

bool RefLayerSupport::IsArgMinMaxSupported(const armnn::TensorInfo &input, const armnn::TensorInfo &output,
                                           const armnn::ArgMinMaxDescriptor &descriptor,
                                           armnn::Optional<std::string &> reasonIfUnsupported) const
{
    IgnoreUnused(descriptor);

    std::array<DataType, 8> supportedInputTypes =
    {
        DataType::Float16,
        DataType::Float32,
        DataType::QAsymmS8,
        DataType::QAsymmU8,
        DataType::QSymmS16,
        DataType::Signed32,
        DataType::Signed64
    };

    std::array<DataType,2> supportedOutputTypes = {
        DataType::Signed32,
        DataType::Signed64
    };

    bool supported = true;

    supported &= CheckSupportRule(TypeAnyOf(input, supportedInputTypes), reasonIfUnsupported,
                                  "Reference ArgMinMax: input is not a supported type.");
    supported &= CheckSupportRule(TypeAnyOf(output, supportedOutputTypes), reasonIfUnsupported,
                                  "Reference ArgMinMax: output type not supported");

    return supported;
}

bool RefLayerSupport::IsBatchMatMulSupported(const TensorInfo& inputX,
                                             const TensorInfo& inputY,
                                             const TensorInfo& output,
                                             const BatchMatMulDescriptor& descriptor,
                                             Optional<std::string &> reasonIfUnsupported) const
{
    IgnoreUnused(descriptor);

    std::array<DataType, 6> supportedTypes =
    {
        DataType::Float16,
        DataType::Float32,
        DataType::QAsymmS8,
        DataType::QAsymmU8,
        DataType::QSymmS16
    };

    bool supported = true;

    supported &= CheckSupportRule(TypeAnyOf(inputX, supportedTypes), reasonIfUnsupported,
                                  "Reference batch matrix multiplication: input X is not a supported type");

    supported &= CheckSupportRule(TypeAnyOf(inputY, supportedTypes), reasonIfUnsupported,
                                  "Reference batch matrix multiplication: input Y is not a supported type");

    supported &= CheckSupportRule(TypeAnyOf(output, supportedTypes), reasonIfUnsupported,
                                  "Reference batch matrix multiplication: output is not a supported type");

    supported &= CheckSupportRule(TypesAreEqual(inputX, inputY), reasonIfUnsupported,
                                  "Reference batch matrix multiplication: input X and input Y types are mismatched");

    supported &= CheckSupportRule(TypesAreEqual(inputX, output), reasonIfUnsupported,
                                  "Reference batch matrix multiplication: inputs and output types are mismatched");

    supported &= CheckSupportRule(TensorNumDimensionsAreGreaterOrEqualTo(inputX, 2),
                                  reasonIfUnsupported,
                                  "Reference batch matrix multiplication: input X is not of rank 2 or greater");

    supported &= CheckSupportRule(TensorNumDimensionsAreGreaterOrEqualTo(inputY, 2),
                                  reasonIfUnsupported,
                                  "Reference batch matrix multiplication: input Y is not of rank 2 or greater");

    return supported;
}

bool RefLayerSupport::IsBatchNormalizationSupported(const TensorInfo& input,
                                                    const TensorInfo& output,
                                                    const TensorInfo& mean,
                                                    const TensorInfo& variance,
                                                    const TensorInfo& beta,
                                                    const TensorInfo& gamma,
                                                    const BatchNormalizationDescriptor& descriptor,
                                                    Optional<std::string&> reasonIfUnsupported) const
{
    IgnoreUnused(descriptor);

    std::array<DataType, 6> supportedTypes =
    {
        DataType::Float32,
        DataType::Float16,
        DataType::QAsymmS8,
        DataType::QAsymmU8,
        DataType::QSymmS16
    };

    bool supported = true;

    supported &= CheckSupportRule(TypeAnyOf(input, supportedTypes), reasonIfUnsupported,
                                  "Reference batch normalization: input is not a supported type.");

    supported &= CheckSupportRule(TypeAnyOf(output, supportedTypes), reasonIfUnsupported,
                                  "Reference batch normalization: output is not a supported type.");

    supported &= CheckSupportRule(TypesAreEqual(input, output), reasonIfUnsupported,
                                  "Reference batch normalization: input and output types are mismatched");

    supported &= CheckSupportRule(TypeAnyOf(mean, supportedTypes), reasonIfUnsupported,
                                  "Reference batch normalization: mean is not a supported type.");

    supported &= CheckSupportRule(TypeAnyOf(variance, supportedTypes), reasonIfUnsupported,
                                  "Reference batch normalization: variance is not a supported type.");

    supported &= CheckSupportRule(TypeAnyOf(beta, supportedTypes), reasonIfUnsupported,
                                  "Reference batch normalization: beta is not a supported type.");

    supported &= CheckSupportRule(TypeAnyOf(gamma, supportedTypes), reasonIfUnsupported,
                                  "Reference batch normalization: gamma is not a supported type.");

    return supported;
}

bool RefLayerSupport::IsBatchToSpaceNdSupported(const TensorInfo& input,
                                                const TensorInfo& output,
                                                const BatchToSpaceNdDescriptor& descriptor,
                                                Optional<std::string&> reasonIfUnsupported) const
{
    IgnoreUnused(descriptor);

    bool supported = true;

    std::string batchToSpaceNdLayerStr = "batchToSpaceNd";
    std::string inputTensorStr = "input";
    std::string outputTensorStr = "output";

    // Define supported types.
    std::array<DataType,6> supportedTypes =
    {
        DataType::Float32,
        DataType::Float16,
        DataType::QAsymmS8,
        DataType::QAsymmU8,
        DataType::QSymmS16
    };

    supported &= CheckSupportRule(TypeAnyOf(input, supportedTypes), reasonIfUnsupported,
                                  "Reference BatchToSpaceNd: input type not supported.");

    supported &= CheckSupportRule(TypeAnyOf(output, supportedTypes), reasonIfUnsupported,
                                  "Reference BatchToSpaceNd: output type not supported.");

    supported &= CheckSupportRule(TypesAreEqual(input, output), reasonIfUnsupported,
                                  "Reference BatchToSpaceNd: input and output types mismatched.");

    return supported;
}

bool RefLayerSupport::IsBroadcastToSupported(const TensorInfo& input,
                            const TensorInfo& output,
                            const BroadcastToDescriptor& descriptor,
                            Optional<std::string&> reasonIfUnsupported) const
{
    IgnoreUnused(descriptor);

    bool supported = true;

    std::array<DataType, 8> supportedTypes
            {
                        DataType::Float32,
                                DataType::Float16,
                                DataType::QAsymmS8,
                                DataType::QAsymmU8,
                                DataType::QSymmS8,
                                DataType::QSymmS16,
                                DataType::Signed32,
                                DataType::Signed64
                };

    supported &= CheckSupportRule(TypeAnyOf(input, supportedTypes), reasonIfUnsupported,
                                                                     "BroadcastTo: input type not supported.");

    supported &= CheckSupportRule(TypeAnyOf(output, supportedTypes), reasonIfUnsupported,
                                                                     "BroadcastTo: output type not supported");

    return supported;
}

bool RefLayerSupport::IsCastSupported(const TensorInfo& input,
                                      const TensorInfo& output,
                                      Optional<std::string&> reasonIfUnsupported) const
{
    std::array<DataType, 10> supportedInputTypes =
        {
                DataType::Float32,
                DataType::Float16,
                DataType::QSymmS8,
                DataType::QAsymmS8,
                DataType::QAsymmU8,
                DataType::QSymmS16,
                DataType::Signed32,
                DataType::Signed64
        };

    bool supported = true;
    supported &= CheckSupportRule(TypeAnyOf(input, supportedInputTypes), reasonIfUnsupported,
                                  "Reference cast: input is not a supported type");


    supported &= CheckSupportRule(TypeAnyOf(output, supportedInputTypes), reasonIfUnsupported,
                                  "Reference cast: output is not a supported type");

    supported &= CheckSupportRule(ShapesAreSameTotalSize(input, output), reasonIfUnsupported,
                                  "Reference cast: input and output shapes have different number of total elements");

    return supported;
}

bool RefLayerSupport::IsChannelShuffleSupported(const TensorInfo& input,
                                                const TensorInfo& output,
                                                const ChannelShuffleDescriptor& descriptor,
                                                Optional<std::string&> reasonIfUnsupported) const
{
    IgnoreUnused(descriptor);
    bool supported = true;

    // Define supported output and inputs types.
    std::array<DataType, 7> supportedTypes =
    {
        DataType::Float32,
        DataType::Float16,
        DataType::QAsymmS8,
        DataType::QAsymmU8,
        DataType::QSymmS8,
        DataType::QSymmS16
    };

    supported &= CheckSupportRule(TypeAnyOf(input, supportedTypes), reasonIfUnsupported,
                                  "Reference ChannelShuffle: input is not a supported type.");

    supported &= CheckSupportRule(TypeAnyOf(output, supportedTypes), reasonIfUnsupported,
                                  "Reference ChannelShuffle: output is not a supported type.");

    supported &= CheckSupportRule(TypesAreEqual(input, output), reasonIfUnsupported,
                                  "Reference ChannelShuffle: input and output types are mismatched.");

    return supported;
}


bool RefLayerSupport::IsComparisonSupported(const TensorInfo& input0,
                                            const TensorInfo& input1,
                                            const TensorInfo& output,
                                            const ComparisonDescriptor& descriptor,
                                            Optional<std::string&> reasonIfUnsupported) const
{
    IgnoreUnused(descriptor);
    std::array<DataType, 8> supportedInputTypes =
    {
        DataType::Boolean,
        DataType::Float32,
        DataType::Float16,
        DataType::QAsymmS8,
        DataType::QAsymmU8,
        DataType::QSymmS16,
        DataType::Signed32
    };

    bool supported = true;
    supported &= CheckSupportRule(TypeAnyOf(input0, supportedInputTypes), reasonIfUnsupported,
                                  "Reference comparison: input 0 is not a supported type");

    supported &= CheckSupportRule(TypesAreEqual(input0, input1), reasonIfUnsupported,
                                  "Reference comparison: input 0 and Input 1 types are mismatched");

    supported &= CheckSupportRule(TypeIs(output, DataType::Boolean), reasonIfUnsupported,
                                  "Reference comparison: output is not of type Boolean");

    supported &= CheckSupportRule(ShapesAreBroadcastCompatible(input0, input1, output), reasonIfUnsupported,
                                  "Reference comparison: shapes are not suitable for implicit broadcast.");

    return supported;
}

bool RefLayerSupport::IsConcatSupported(const std::vector<const TensorInfo*> inputs,
                                        const TensorInfo& output,
                                        const OriginsDescriptor& descriptor,
                                        Optional<std::string&> reasonIfUnsupported) const
{
    IgnoreUnused(descriptor);

    bool supported = true;
    std::array<DataType,7> supportedTypes =
    {
        DataType::Float32,
        DataType::Float16,
        DataType::QAsymmS8,
        DataType::QAsymmU8,
        DataType::QSymmS16,
        DataType::Signed32
    };

    supported &= CheckSupportRule(TypeAnyOf(output, supportedTypes), reasonIfUnsupported,
                                  "Reference concatenation: output type not supported");
    for (const TensorInfo* input : inputs)
    {
        supported &= CheckSupportRule(TypeAnyOf(*input, supportedTypes), reasonIfUnsupported,
            "Reference concatenation: input type not supported");

        supported &= CheckSupportRule(TypesAreEqual(*input, output), reasonIfUnsupported,
            "Reference concatenation: input and output types mismatched.");
    }

    return supported;
}

bool RefLayerSupport::IsConstantSupported(const TensorInfo& output,
                                          Optional<std::string&> reasonIfUnsupported) const
{
    std::array<DataType,8> supportedTypes =
    {
        DataType::Float16,
        DataType::Float32,
        DataType::QAsymmS8,
        DataType::QAsymmU8,
        DataType::QSymmS8,
        DataType::QSymmS16,
        DataType::Signed32
    };

    return CheckSupportRule(TypeAnyOf(output, supportedTypes), reasonIfUnsupported,
                                  "Reference constant: output is not a supported type.");
}

bool RefLayerSupport::IsConvertFp16ToFp32Supported(const TensorInfo& input,
                                                   const TensorInfo& output,
                                                   Optional<std::string&> reasonIfUnsupported) const
{
    return (IsSupportedForDataTypeGeneric(reasonIfUnsupported,
                                          input.GetDataType(),
                                          &TrueFunc<>,
                                          &FalseInputFuncF32<>,
                                          &FalseFuncU8<>,
                                          &FalseFuncI32<>,
                                          &FalseFuncU8<>) &&
            IsSupportedForDataTypeGeneric(reasonIfUnsupported,
                                          output.GetDataType(),
                                          &FalseOutputFuncF16<>,
                                          &TrueFunc<>,
                                          &FalseFuncU8<>,
                                          &FalseFuncI32<>,
                                          &FalseFuncU8<>));
}

bool RefLayerSupport::IsConvertFp32ToFp16Supported(const TensorInfo& input,
                                                   const TensorInfo& output,
                                                   Optional<std::string&> reasonIfUnsupported) const
{
    return (IsSupportedForDataTypeGeneric(reasonIfUnsupported,
                                          input.GetDataType(),
                                          &FalseInputFuncF16<>,
                                          &TrueFunc<>,
                                          &FalseFuncU8<>,
                                          &FalseFuncI32<>,
                                          &FalseFuncU8<>) &&
            IsSupportedForDataTypeGeneric(reasonIfUnsupported,
                                          output.GetDataType(),
                                          &TrueFunc<>,
                                          &FalseOutputFuncF32<>,
                                          &FalseFuncU8<>,
                                          &FalseFuncI32<>,
                                          &FalseFuncU8<>));
}

bool RefLayerSupport::IsConvolution2dSupported(const TensorInfo& input,
                                               const TensorInfo& output,
                                               const Convolution2dDescriptor& descriptor,
                                               const TensorInfo& weights,
                                               const Optional<TensorInfo>& biases,
                                               Optional<std::string&> reasonIfUnsupported) const
{
    bool supported = true;

    // Define supported types.
    std::array<DataType,7> supportedTypes =
    {
        DataType::Float32,
        DataType::Float16,
        DataType::QAsymmS8,
        DataType::QAsymmU8,
        DataType::QSymmS8,
        DataType::QSymmS16
    };

    supported &= CheckSupportRule(TypeAnyOf(input, supportedTypes), reasonIfUnsupported,
                                  "Reference Convolution2d: input is not a supported type.");

    supported &= CheckSupportRule(TypeAnyOf(output, supportedTypes), reasonIfUnsupported,
                                  "Reference Convolution2d: output is not a supported type.");

    supported &= CheckSupportRule(TypesAreEqual(input, output), reasonIfUnsupported,
                              "Reference Convolution2d: input and output types mismatched.");


    const DataType inputType = input.GetDataType();
    if (IsQuantized8BitType(inputType))
    {
        std::array<DataType, 3> supportedWeightTypes =
        {
            DataType::QAsymmS8,
            DataType::QAsymmU8,
            DataType::QSymmS8
        };

        supported &= CheckSupportRule(TypeAnyOf(weights, supportedWeightTypes), reasonIfUnsupported,
                                      "Reference Convolution2d: weights type not supported for quantized input.");
    }
    else
    {
        supported &= CheckSupportRule(TypeAnyOf(weights, supportedTypes), reasonIfUnsupported,
                                      "Reference Convolution2d: weights is not a supported type.");

        supported &= CheckSupportRule(TypesAreEqual(input, weights), reasonIfUnsupported,
                                      "Reference Convolution2d: input and weights types mismatched.");
    }

    if (biases.has_value())
    {
        std::array<DataType,4> biasesSupportedTypes =
        {
            DataType::Float32,
            DataType::Float16,
            DataType::Signed32
        };

        supported &= CheckSupportRule(TypeAnyOf(biases.value(), biasesSupportedTypes), reasonIfUnsupported,
                                      "Reference Convolution2d: biases is not a supported type.");
    }
    IgnoreUnused(descriptor);

    return supported;
}

bool RefLayerSupport::IsConvolution3dSupported(const TensorInfo& input,
                                               const TensorInfo& output,
                                               const Convolution3dDescriptor& descriptor,
                                               const TensorInfo& weights,
                                               const Optional<TensorInfo>& biases,
                                               Optional<std::string&> reasonIfUnsupported) const
{
    bool supported = true;

    // Define supported types.
    std::array<DataType,7> supportedTypes =
    {
        DataType::Float32,
        DataType::Float16,
        DataType::QAsymmS8,
        DataType::QAsymmU8,
        DataType::QSymmS8,
        DataType::QSymmS16
    };

    supported &= CheckSupportRule(TypeAnyOf(input, supportedTypes), reasonIfUnsupported,
                                  "Reference Convolution3d: input is not a supported type.");

    supported &= CheckSupportRule(TypeAnyOf(output, supportedTypes), reasonIfUnsupported,
                                  "Reference Convolution3d: output is not a supported type.");

    supported &= CheckSupportRule(TypesAreEqual(input, output), reasonIfUnsupported,
                                  "Reference Convolution3d: input and output types mismatched.");

    const DataType inputType = input.GetDataType();
    if (IsQuantized8BitType(inputType))
    {
        std::array<DataType, 3> supportedWeightTypes =
        {
            DataType::QAsymmS8,
            DataType::QAsymmU8,
            DataType::QSymmS8
        };

        supported &= CheckSupportRule(TypeAnyOf(weights, supportedWeightTypes), reasonIfUnsupported,
                                      "Reference Convolution3d: weights type not supported for quantized input.");
    }
    else
    {
        supported &= CheckSupportRule(TypeAnyOf(weights, supportedTypes), reasonIfUnsupported,
                                      "Reference Convolution3d: weights is not a supported type.");

        supported &= CheckSupportRule(TypesAreEqual(input, weights), reasonIfUnsupported,
                                      "Reference Convolution3d: input and weights types mismatched.");
    }

    if (biases.has_value())
    {
        std::array<DataType,4> biasesSupportedTypes =
        {
            DataType::Float32,
            DataType::Float16,
            DataType::Signed32
        };

        supported &= CheckSupportRule(TypeAnyOf(biases.value(), biasesSupportedTypes), reasonIfUnsupported,
                                      "Reference Convolution3d: biases is not a supported type.");
    }
    IgnoreUnused(descriptor);

    return supported;
}

bool RefLayerSupport::IsDebugSupported(const TensorInfo& input,
                                       const TensorInfo& output,
                                       Optional<std::string&> reasonIfUnsupported) const
{
    bool supported = true;

    std::array<DataType, 8> supportedTypes =
    {
        DataType::BFloat16,
        DataType::Float16,
        DataType::Float32,
        DataType::QAsymmS8,
        DataType::QAsymmU8,
        DataType::QSymmS8,
        DataType::QSymmS16,
        DataType::Signed32
    };

    supported &= CheckSupportRule(TypeAnyOf(input, supportedTypes), reasonIfUnsupported,
                                  "Reference for Debug layer: input type not supported");

    supported &= CheckSupportRule(TypeAnyOf(output, supportedTypes), reasonIfUnsupported,
                                  "Reference for Debug layer: output type not supported");

    supported &= CheckSupportRule(TypesAreEqual(input, output), reasonIfUnsupported,
                                  "Reference for Debug layer: input and output types are mismatched");

    return supported;
}

bool RefLayerSupport::IsDepthToSpaceSupported(const TensorInfo& input,
                                              const TensorInfo& output,
                                              const DepthToSpaceDescriptor& descriptor,
                                              Optional<std::string&> reasonIfUnsupported) const
{
    IgnoreUnused(descriptor);
    bool supported = true;

    std::array<DataType,6> supportedTypes =
    {
        DataType::Float32,
        DataType::Float16,
        DataType::QAsymmS8,
        DataType::QAsymmU8,
        DataType::QSymmS16
    };

    supported &= CheckSupportRule(TypeAnyOf(input, supportedTypes), reasonIfUnsupported,
        "Reference DepthToSpace: input type not supported");

    supported &= CheckSupportRule(TypeAnyOf(output, supportedTypes), reasonIfUnsupported,
        "Reference DepthToSpace: output type not supported");

    supported &= CheckSupportRule(TypesAreEqual(input, output), reasonIfUnsupported,
        "Reference DepthToSpace: input and output types are mismatched");

    return supported;
}

bool RefLayerSupport::IsDepthwiseConvolutionSupported(const TensorInfo& input,
                                                      const TensorInfo& output,
                                                      const DepthwiseConvolution2dDescriptor& descriptor,
                                                      const TensorInfo& weights,
                                                      const Optional<TensorInfo>& biases,
                                                      Optional<std::string&> reasonIfUnsupported) const
{
    IgnoreUnused(descriptor);
    bool supported = true;

    // Define supported types.
    std::array<DataType,7> supportedTypes =
    {
        DataType::Float32,
        DataType::Float16,
        DataType::QAsymmS8,
        DataType::QAsymmU8,
        DataType::QSymmS8,
        DataType::QSymmS16
    };

    supported &= CheckSupportRule(TypeAnyOf(input, supportedTypes), reasonIfUnsupported,
                                  "Reference DepthwiseConvolution2d: input is not a supported type.");

    supported &= CheckSupportRule(TypeAnyOf(output, supportedTypes), reasonIfUnsupported,
                                  "Reference DepthwiseConvolution2d: output is not a supported type.");

    supported &= CheckSupportRule(TypesAreEqual(input, output), reasonIfUnsupported,
                                  "Reference DepthwiseConvolution2d: input and output types mismatched.");

    const DataType inputType = input.GetDataType();
    if (IsQuantized8BitType(inputType))
    {
        std::array<DataType, 3> supportedWeightTypes =
                {
                        DataType::QAsymmS8,
                        DataType::QAsymmU8,
                        DataType::QSymmS8,
                };

        supported &= CheckSupportRule(TypeAnyOf(weights, supportedWeightTypes), reasonIfUnsupported,
                                       "Reference DepthwiseConvolution2d: weights type not supported for "
                                       "quantized input.");
    }
    else
    {
        supported &= CheckSupportRule(TypeAnyOf(weights, supportedTypes), reasonIfUnsupported,
                                      "Reference DepthwiseConvolution2d: weights is not a supported type.");

        supported &= CheckSupportRule(TypesAreEqual(input, weights), reasonIfUnsupported,
                                      "Reference DepthwiseConvolution2d: input and weights types mismatched.");
    }

    if (biases.has_value())
    {
        std::array<DataType,4> biasesSupportedTypes =
        {
            DataType::Float32,
            DataType::Float16,
            DataType::Signed32
        };
        supported &= CheckSupportRule(TypeAnyOf(biases.value(), biasesSupportedTypes), reasonIfUnsupported,
                                      "Reference DepthwiseConvolution2d: biases is not a supported type.");
    }

    return supported;

}

bool RefLayerSupport::IsDequantizeSupported(const TensorInfo& input,
                                            const TensorInfo& output,
                                            Optional<std::string&> reasonIfUnsupported) const
{
   bool supported = true;

    std::array<DataType,5> supportedInputTypes = {
        DataType::QAsymmS8,
        DataType::QAsymmU8,
        DataType::QSymmS8,
        DataType::QSymmS16,
        DataType::Float16
    };

    supported &= CheckSupportRule(TypeAnyOf(input, supportedInputTypes), reasonIfUnsupported,
                                  "Reference for Dequantize layer: input type not supported.");

    supported &= CheckSupportRule(TypeNotPerAxisQuantized(input), reasonIfUnsupported,
                                  "Reference for Dequantize layer: per-axis quantized input not supported.");

    std::array<DataType,3> supportedOutputTypes = {
        DataType::Float32,
        DataType::Float16
    };

    supported &= CheckSupportRule(TypeAnyOf(output, supportedOutputTypes), reasonIfUnsupported,
                                  "Reference for Dequantize layer: output type not supported.");

    supported &= CheckSupportRule(ShapesAreSameTotalSize(input, output), reasonIfUnsupported,
                                  "Reference for Dequantize layer: input/output shapes have different num total "
                                  "elements.");

    return supported;
}

bool RefLayerSupport::IsDetectionPostProcessSupported(const TensorInfo& boxEncodings,
                                                      const TensorInfo& scores,
                                                      const TensorInfo& anchors,
                                                      const TensorInfo& detectionBoxes,
                                                      const TensorInfo& detectionClasses,
                                                      const TensorInfo& detectionScores,
                                                      const TensorInfo& numDetections,
                                                      const DetectionPostProcessDescriptor& descriptor,
                                                      Optional<std::string&> reasonIfUnsupported) const
{
    IgnoreUnused(anchors, detectionBoxes, detectionClasses, detectionScores, numDetections, descriptor);

    bool supported = true;

    std::array<DataType,6> supportedInputTypes =
    {
        DataType::Float32,
        DataType::Float16,
        DataType::QAsymmS8,
        DataType::QAsymmU8,
        DataType::QSymmS16
    };

    supported &= CheckSupportRule(TypeAnyOf(boxEncodings, supportedInputTypes), reasonIfUnsupported,
                                  "Reference DetectionPostProcess: input 0 is not a supported type.");

    supported &= CheckSupportRule(TypeAnyOf(scores, supportedInputTypes), reasonIfUnsupported,
                                  "Reference DetectionPostProcess: input 1 is not a supported type.");

    return supported;
}

bool RefLayerSupport::IsDilatedDepthwiseConvolutionSupported(const TensorInfo& input,
                                                             const TensorInfo& output,
                                                             const DepthwiseConvolution2dDescriptor& descriptor,
                                                             const TensorInfo& weights,
                                                             const Optional<TensorInfo>& biases,
                                                             Optional<std::string&> reasonIfUnsupported) const
{
    return IsDepthwiseConvolutionSupported(input, output, descriptor, weights, biases, reasonIfUnsupported);
}

bool RefLayerSupport::IsDivisionSupported(const TensorInfo& input0,
                                          const TensorInfo& input1,
                                          const TensorInfo& output,
                                          Optional<std::string&> reasonIfUnsupported) const
{
    bool supported = true;

    std::array<DataType,7> supportedTypes = {
        DataType::Float32,
        DataType::Float16,
        DataType::QAsymmS8,
        DataType::QAsymmU8,
        DataType::QSymmS16,
        DataType::Signed32
    };

    supported &= CheckSupportRule(TypeAnyOf(input0, supportedTypes), reasonIfUnsupported,
                                  "Reference division: input 0 is not a supported type.");

    supported &= CheckSupportRule(TypeAnyOf(input1, supportedTypes), reasonIfUnsupported,
                                  "Reference division: input 1 is not a supported type.");

    supported &= CheckSupportRule(TypeAnyOf(output, supportedTypes), reasonIfUnsupported,
                                  "Reference division: output is not a supported type.");

    supported &= CheckSupportRule(TypesAreEqual(input0, input1), reasonIfUnsupported,
                                  "Reference division: input 0 and Input 1 types are mismatched");

    supported &= CheckSupportRule(TypesAreEqual(input0, output), reasonIfUnsupported,
                                  "Reference division: input and output types are mismatched");

    supported &= CheckSupportRule(ShapesAreBroadcastCompatible(input0, input1, output), reasonIfUnsupported,
                                  "Reference division: shapes are not suitable for implicit broadcast.");

    return supported;
}

bool RefLayerSupport::IsElementwiseUnarySupported(const TensorInfo& input,
                                                  const TensorInfo& output,
                                                  const ElementwiseUnaryDescriptor& descriptor,
                                                  Optional<std::string&> reasonIfUnsupported) const
{
    IgnoreUnused(descriptor);

    std::array<DataType, 7> supportedTypes =
    {
        DataType::Float32,
        DataType::Float16,
        DataType::QAsymmS8,
        DataType::QAsymmU8,
        DataType::QSymmS16,
        DataType::Signed32
    };

    std::array<DataType, 1> logicalSupportedTypes =
    {
        DataType::Boolean
    };

    bool supported = true;

    if (descriptor.m_Operation == UnaryOperation::LogicalNot)
    {
        supported &= CheckSupportRule(TypeAnyOf(input, logicalSupportedTypes), reasonIfUnsupported,
                                      "Reference elementwise unary: input type not supported");

        supported &= CheckSupportRule(TypeAnyOf(output, logicalSupportedTypes), reasonIfUnsupported,
                                      "Reference elementwise unary: output type not supported");
    }
    else
    {
        supported &= CheckSupportRule(TypeAnyOf(input, supportedTypes), reasonIfUnsupported,
                                      "Reference elementwise unary: input type not supported");

        supported &= CheckSupportRule(TypeAnyOf(output, supportedTypes), reasonIfUnsupported,
                                      "Reference elementwise unary: output type not supported");
    }

    supported &= CheckSupportRule(TypesAreEqual(input, output), reasonIfUnsupported,
                                  "Reference elementwise unary: input and output types not matching");

    supported &= CheckSupportRule(ShapesAreSameTotalSize(input, output), reasonIfUnsupported,
                                  "Reference elementwise unary: input and output shapes"
                                  "have different number of total elements");

    return supported;
}

bool RefLayerSupport::IsFakeQuantizationSupported(const TensorInfo& input,
                                                  const FakeQuantizationDescriptor& descriptor,
                                                  Optional<std::string&> reasonIfUnsupported) const
{
    IgnoreUnused(descriptor);
    bool supported = true;

    std::array<DataType,1> supportedTypes =
    {
        DataType::Float32
    };

    supported &= CheckSupportRule(TypeAnyOf(input, supportedTypes), reasonIfUnsupported,
                                  "Reference fake quantization: input type not supported.");

    return supported;
}

bool RefLayerSupport::IsFillSupported(const TensorInfo& input,
                                      const TensorInfo& output,
                                      const FillDescriptor& descriptor,
                                      Optional<std::string&> reasonIfUnsupported) const
{
    IgnoreUnused(descriptor);
    IgnoreUnused(output);

    bool supported = true;

    std::array<DataType,3> supportedTypes =
    {
        DataType::Float32,
        DataType::Float16,
        DataType::Signed32
    };

    supported &= CheckSupportRule(TypeIs(input, DataType::Signed32), reasonIfUnsupported,
                                  "Reference Fill: input type not supported.");

    supported &= CheckSupportRule(TypeAnyOf(output, supportedTypes), reasonIfUnsupported,
                                  "Reference Fill: output type not supported.");
    return supported;
}

bool RefLayerSupport::IsFloorSupported(const TensorInfo& input,
                                       const TensorInfo& output,
                                       Optional<std::string&> reasonIfUnsupported) const
{
    IgnoreUnused(output);
    bool supported = true;

    std::array<DataType,3> supportedTypes =
    {
        DataType::Float32,
        DataType::Float16
    };

    supported &= CheckSupportRule(TypeAnyOf(input, supportedTypes), reasonIfUnsupported,
                                  "Reference Floor: input type not supported.");

    supported &= CheckSupportRule(TypeAnyOf(output, supportedTypes), reasonIfUnsupported,
                                  "Reference Floor: output type not supported.");

    return supported;
}

bool RefLayerSupport::IsFullyConnectedSupported(const TensorInfo& input,
                                                const TensorInfo& output,
                                                const TensorInfo& weights,
                                                const TensorInfo& biases,
                                                const FullyConnectedDescriptor& descriptor,
                                                Optional<std::string&> reasonIfUnsupported) const
{
    bool supported = true;

    // Define supported types.
    std::array<DataType,6> supportedTypes =
    {
        DataType::Float32,
        DataType::Float16,
        DataType::QAsymmS8,
        DataType::QAsymmU8,
        DataType::QSymmS16
    };

    supported &= CheckSupportRule(TypeAnyOf(input, supportedTypes), reasonIfUnsupported,
                                  "Reference Fully Connected: input type not supported.");

    supported &= CheckSupportRule(TypeAnyOf(output, supportedTypes), reasonIfUnsupported,
                                  "Reference Fully Connected: output type not supported.");

    supported &= CheckSupportRule(TypeAnyOf(weights, supportedTypes), reasonIfUnsupported,
                                  "Reference Fully Connected: weights type not supported.");

    supported &= CheckSupportRule(TypesAreEqual(input, output), reasonIfUnsupported,
                              "Reference Fully Connected: input and output types mismatched.");

    supported &= CheckSupportRule(TypeAnyOf(weights, supportedTypes), reasonIfUnsupported,
                                  "Reference Fully Connected: weights is not a supported type.");

    supported &= CheckSupportRule(TypesAreEqual(input, weights), reasonIfUnsupported,
                                  "Reference Fully Connected: input and weights types mismatched.");

    if (descriptor.m_BiasEnabled)
    {
        // Defined supported types for bias
        std::array<DataType, 5>
        supportedBiasTypes =
        {
            DataType::Float32,
            DataType::Float16,
            DataType::Signed32,
            DataType::QAsymmS8
        };

        supported &= CheckSupportRule(TypeAnyOf(biases, supportedBiasTypes), reasonIfUnsupported,
                                      "Reference Fully Connected: bias type not supported.");

        supported &= CheckSupportRule(BiasAndWeightsTypesMatch(biases, weights), reasonIfUnsupported,
                                      "Reference Fully Connected: bias and weight types mismatch.");

        supported &= CheckSupportRule(BiasAndWeightsTypesCompatible(weights, supportedBiasTypes), reasonIfUnsupported,
                                      "Reference Fully Connected: bias type inferred from weights is incompatible.");

        supported &= CheckSupportRule(TensorNumDimensionsAreCorrect(biases, 1U), reasonIfUnsupported,
                                      "Reference Fully Connected: bias must have 1 dimension.");

    }

    return supported;
}

bool RefLayerSupport::IsGatherNdSupported(const armnn::TensorInfo& input0,
                                          const armnn::TensorInfo& input1,
                                          const armnn::TensorInfo& output,
                                          armnn::Optional<std::string&> reasonIfUnsupported) const
{
    bool supported = true;
    std::array<DataType,7> supportedTypes =
    {
            DataType::Float32,
            DataType::Float16,
            DataType::QAsymmS8,
            DataType::QAsymmU8,
            DataType::QSymmS16,
            DataType::Signed32
    };

    supported &= CheckSupportRule(TypeAnyOf(input0, supportedTypes), reasonIfUnsupported,
                                  "Reference GatherNd: input type not supported");

    supported &= CheckSupportRule(TypeAnyOf(output, supportedTypes), reasonIfUnsupported,
                                  "Reference GatherNd: output type not supported");

    supported &= CheckSupportRule(TypeIs(input1, DataType::Signed32), reasonIfUnsupported,
                                  "Reference GatherNd: indices (input1) type not supported");

    supported &= CheckSupportRule(TypesAreEqual(input0, output), reasonIfUnsupported,
                                  "Reference GatherNd: input and output types not matching");

    return supported;
}

bool RefLayerSupport::IsGatherSupported(const armnn::TensorInfo& input0,
                                        const armnn::TensorInfo& input1,
                                        const armnn::TensorInfo& output,
                                        const GatherDescriptor& descriptor,
                                        armnn::Optional<std::string&> reasonIfUnsupported) const
{
    bool supported = true;
    std::array<DataType,7> supportedTypes =
    {
        DataType::Float32,
        DataType::Float16,
        DataType::QAsymmS8,
        DataType::QAsymmU8,
        DataType::QSymmS16,
        DataType::Signed32
    };

    IgnoreUnused(descriptor);
    supported &= CheckSupportRule(TypeAnyOf(input0, supportedTypes), reasonIfUnsupported,
                                  "Reference Gather: input type not supported");

    supported &= CheckSupportRule(TypeAnyOf(output, supportedTypes), reasonIfUnsupported,
                                  "Reference Gather: output type not supported");

    supported &= CheckSupportRule(TypeIs(input1, DataType::Signed32), reasonIfUnsupported,
                                  "Reference Gather: indices (input1) type not supported");

    supported &= CheckSupportRule(TypesAreEqual(input0, output), reasonIfUnsupported,
                                  "Reference Gather: input and output types not matching");

    return supported;
}

bool RefLayerSupport::IsInputSupported(const TensorInfo& /*input*/,
                                       Optional<std::string&> /*reasonIfUnsupported*/) const
{
    return true;
}

bool RefLayerSupport::IsInstanceNormalizationSupported(const TensorInfo& input,
                                                       const TensorInfo& output,
                                                       const InstanceNormalizationDescriptor& descriptor,
                                                       Optional<std::string&> reasonIfUnsupported) const
{
    IgnoreUnused(descriptor);
    // Define supported types
    std::array<DataType, 3> supportedTypes =
        {
            DataType::Float32,
            DataType::Float16
        };

    bool supported = true;

    supported &= CheckSupportRule(TypeAnyOf(input, supportedTypes), reasonIfUnsupported,
                                  "Reference Instance Normalization: input type not supported.");

    supported &= CheckSupportRule(TypeAnyOf(output, supportedTypes), reasonIfUnsupported,
                                  "Reference Instance Normalization: output type not supported.");

    supported &= CheckSupportRule(TypesAreEqual(input, output), reasonIfUnsupported,
                                  "Reference Instance Normalization: input and output types mismatched.");

    supported &= CheckSupportRule(ShapesAreSameTotalSize(input, output), reasonIfUnsupported,
                                  "Reference Instance Normalization: input and output shapes have different "
                                  "num total elements.");

    return supported;
}

bool RefLayerSupport::IsL2NormalizationSupported(const TensorInfo& input,
                                                 const TensorInfo& output,
                                                 const L2NormalizationDescriptor& descriptor,
                                                 Optional<std::string&> reasonIfUnsupported) const
{
    IgnoreUnused(descriptor);
    // Define supported types
    std::array<DataType, 6> supportedTypes =
    {
        DataType::Float32,
        DataType::Float16,
        DataType::QAsymmS8,
        DataType::QAsymmU8,
        DataType::QSymmS16
    };

    bool supported = true;

    supported &= CheckSupportRule(TypeAnyOf(input, supportedTypes), reasonIfUnsupported,
                                  "Reference L2normalization: input type not supported.");

    supported &= CheckSupportRule(TypeAnyOf(output, supportedTypes), reasonIfUnsupported,
                                  "Reference L2normalization: output type not supported.");

    supported &= CheckSupportRule(TypesAreEqual(input, output), reasonIfUnsupported,
                                  "Reference L2normalization: input and output types mismatched.");

    supported &= CheckSupportRule(ShapesAreSameTotalSize(input, output), reasonIfUnsupported,
                                  "Reference L2normalization: input and output shapes have different "
                                  "num total elements.");

    return supported;
}

bool RefLayerSupport::IsLogicalBinarySupported(const TensorInfo& input0,
                                               const TensorInfo& input1,
                                               const TensorInfo& output,
                                               const LogicalBinaryDescriptor& descriptor,
                                               Optional<std::string&> reasonIfUnsupported) const
{
    IgnoreUnused(descriptor);

    std::array<DataType, 1> supportedTypes =
    {
        DataType::Boolean
    };

    bool supported = true;
    supported &= CheckSupportRule(TypeAnyOf(input0, supportedTypes), reasonIfUnsupported,
                                  "Reference LogicalBinary: input 0 type not supported");
    supported &= CheckSupportRule(TypeAnyOf(input1, supportedTypes), reasonIfUnsupported,
                                  "Reference LogicalBinary: input 1 type not supported");

    supported &= CheckSupportRule(TypesAreEqual(input0, output), reasonIfUnsupported,
                                  "Reference LogicalBinary: input and output types do not match");

    supported &= CheckSupportRule(ShapesAreBroadcastCompatible(input0, input1, output), reasonIfUnsupported,
                                  "Reference LogicalBinary: shapes are not suitable for implicit broadcast.");

    return supported;
}

bool RefLayerSupport::IsLogSoftmaxSupported(const TensorInfo& input,
                                            const TensorInfo& output,
                                            const LogSoftmaxDescriptor& descriptor,
                                            Optional<std::string&> reasonIfUnsupported) const
{
    IgnoreUnused(descriptor);

    std::array<DataType, 3> supportedTypes =
    {
        DataType::Float32,
        DataType::Float16
    };

    bool supported = true;
    supported &= CheckSupportRule(TypeAnyOf(input, supportedTypes), reasonIfUnsupported,
                                  "Reference LogSoftmax: input type not supported");

    supported &= CheckSupportRule(TypeAnyOf(output, supportedTypes), reasonIfUnsupported,
                                  "Reference LogSoftmax: output type not supported");

    supported &= CheckSupportRule(TypesAreEqual(input, output), reasonIfUnsupported,
                                  "Reference LogSoftmax: input and output types do not match");

    return supported;
}

bool RefLayerSupport::IsLstmSupported(const TensorInfo& input,
                                      const TensorInfo& outputStateIn,
                                      const TensorInfo& cellStateIn,
                                      const TensorInfo& scratchBuffer,
                                      const TensorInfo& outputStateOut,
                                      const TensorInfo& cellStateOut,
                                      const TensorInfo& output,
                                      const LstmDescriptor& descriptor,
                                      const LstmInputParamsInfo& paramsInfo,
                                      Optional<std::string&> reasonIfUnsupported) const
{
    IgnoreUnused(descriptor);
    IgnoreUnused(paramsInfo);

    bool supported = true;

    std::array<DataType,3> supportedTypes = {
        DataType::Float32,
        DataType::QSymmS16
    };

    // check inputs and outputs
    supported &= CheckSupportRule(TypeAnyOf(input, supportedTypes), reasonIfUnsupported,
                                  "Reference Lstm: input is not a supported type.");
    supported &= CheckSupportRule(TypesAreEqual(input, outputStateIn), reasonIfUnsupported,
                                  "Reference Lstm: input and outputStateIn types are mismatched");
    supported &= CheckSupportRule(TypesAreEqual(input, cellStateIn), reasonIfUnsupported,
                                  "Reference Lstm: input and cellStateIn types are mismatched");
    supported &= CheckSupportRule(TypesAreEqual(input, scratchBuffer), reasonIfUnsupported,
                                  "Reference Lstm: input and scratchBuffer types are mismatched");
    supported &= CheckSupportRule(TypesAreEqual(input, outputStateOut), reasonIfUnsupported,
                                  "Reference Lstm: input and outputStateOut types are mismatched");
    supported &= CheckSupportRule(TypesAreEqual(input, cellStateOut), reasonIfUnsupported,
                                  "Reference Lstm: input and cellStateOut types are mismatched");

    supported &= CheckSupportRule(TypesAreEqual(input, output), reasonIfUnsupported,
                                  "Reference Lstm: input and output types are mismatched");
    // check layer parameters
    supported &= CheckSupportRule(TypesAreEqual(input, paramsInfo.GetInputToForgetWeights()), reasonIfUnsupported,
                                  "Reference Lstm: input and InputToForgetWeights types are mismatched");
    supported &= CheckSupportRule(TypesAreEqual(input, paramsInfo.GetInputToCellWeights()), reasonIfUnsupported,
                                  "Reference Lstm: input and InputToCellWeights types are mismatched");
    supported &= CheckSupportRule(TypesAreEqual(input, paramsInfo.GetInputToOutputWeights()), reasonIfUnsupported,
                                  "Reference Lstm: input and InputToOutputWeights types are mismatched");
    supported &= CheckSupportRule(TypesAreEqual(input, paramsInfo.GetRecurrentToForgetWeights()), reasonIfUnsupported,
                                  "Reference Lstm: input and RecurrentToForgetWeights types are mismatched");
    supported &= CheckSupportRule(TypesAreEqual(input, paramsInfo.GetRecurrentToCellWeights()), reasonIfUnsupported,
                                  "Reference Lstm: input and RecurrentToCellWeights types are mismatched");
    supported &= CheckSupportRule(TypesAreEqual(input, paramsInfo.GetRecurrentToOutputWeights()), reasonIfUnsupported,
                                  "Reference Lstm: input and RecurrentToOutputWeights types are mismatched");
    supported &= CheckSupportRule(TypesAreEqual(input, paramsInfo.GetForgetGateBias()), reasonIfUnsupported,
                                  "Reference Lstm: input and ForgetGateBias types are mismatched");
    supported &= CheckSupportRule(TypesAreEqual(input, paramsInfo.GetCellBias()), reasonIfUnsupported,
                                  "Reference Lstm: input and CellBias types are mismatched");
    supported &= CheckSupportRule(TypesAreEqual(input, paramsInfo.GetOutputGateBias()), reasonIfUnsupported,
                                  "Reference Lstm: input and OutputGateBias types are mismatched");
    if (!descriptor.m_CifgEnabled)
    {
        supported &= CheckSupportRule(TypesAreEqual(input, paramsInfo.GetInputToInputWeights()), reasonIfUnsupported,
                                      "Reference Lstm: input and InputToInputWeights types are mismatched");
        supported &= CheckSupportRule(TypesAreEqual(input, paramsInfo.GetRecurrentToInputWeights()),
                                      reasonIfUnsupported,
                                      "Reference Lstm: input and RecurrentToInputWeights types are mismatched");
        supported &= CheckSupportRule(TypesAreEqual(input, paramsInfo.GetInputGateBias()), reasonIfUnsupported,
                                      "Reference Lstm: input and InputGateBias types are mismatched");
        if (descriptor.m_PeepholeEnabled)
        {
            supported &= CheckSupportRule(TypesAreEqual(input, paramsInfo.GetCellToInputWeights()),
                                          reasonIfUnsupported,
                                          "Reference Lstm: input and CellToInputWeights types are mismatched");
        }
    }
    if (descriptor.m_PeepholeEnabled)
    {
        supported &= CheckSupportRule(TypesAreEqual(input, paramsInfo.GetCellToForgetWeights()), reasonIfUnsupported,
                                      "Reference Lstm: input and CellToForgetWeights types are mismatched");
        supported &= CheckSupportRule(TypesAreEqual(input, paramsInfo.GetCellToOutputWeights()), reasonIfUnsupported,
                                      "Reference Lstm: input and CellToOutputWeights types are mismatched");
    }
    if (descriptor.m_ProjectionEnabled)
    {
        supported &= CheckSupportRule(TypesAreEqual(input, paramsInfo.GetProjectionWeights()), reasonIfUnsupported,
                                      "Reference Lstm: input and mProjectionWeights types are mismatched");
        if (paramsInfo.m_ProjectionBias != nullptr)
        {
            supported &= CheckSupportRule(TypesAreEqual(input, paramsInfo.GetProjectionBias()), reasonIfUnsupported,
                                          "Reference Lstm: input and ProjectionBias types are mismatched");
        }
    }
    if (descriptor.m_LayerNormEnabled)
    {
        if (!descriptor.m_CifgEnabled)
        {
            supported &= CheckSupportRule(TypesAreEqual(input, paramsInfo.GetInputLayerNormWeights()),
                                          reasonIfUnsupported,
                                          "Reference Lstm: input and InputLayerNormWeights types are mismatched");
        }
        supported &= CheckSupportRule(TypesAreEqual(input, paramsInfo.GetForgetLayerNormWeights()),
                                      reasonIfUnsupported,
                                      "Reference Lstm: input and ForgetLayerNormWeights types are mismatched");
        supported &= CheckSupportRule(TypesAreEqual(input, paramsInfo.GetCellLayerNormWeights()),
                                      reasonIfUnsupported,
                                      "Reference Lstm: input and CellLayerNormWeights types are mismatched");
        supported &= CheckSupportRule(TypesAreEqual(input, paramsInfo.GetOutputLayerNormWeights()),
                                      reasonIfUnsupported,
                                      "Reference Lstm: input and OutputLayerNormWeights types are mismatched");
    }

    return supported;
}

bool RefLayerSupport::IsMaximumSupported(const TensorInfo& input0,
                                         const TensorInfo& input1,
                                         const TensorInfo& output,
                                         Optional<std::string&> reasonIfUnsupported) const
{
    bool supported = true;

    std::array<DataType,7> supportedTypes = {
        DataType::Float32,
        DataType::Float16,
        DataType::QAsymmS8,
        DataType::QAsymmU8,
        DataType::QSymmS16,
        DataType::Signed32
    };

    supported &= CheckSupportRule(TypeAnyOf(input0, supportedTypes), reasonIfUnsupported,
                                  "Reference maximum: input 0 is not a supported type.");

    supported &= CheckSupportRule(TypeAnyOf(input1, supportedTypes), reasonIfUnsupported,
                                  "Reference maximum: input 1 is not a supported type.");

    supported &= CheckSupportRule(TypeAnyOf(output, supportedTypes), reasonIfUnsupported,
                                  "Reference maximum: output is not a supported type.");

    supported &= CheckSupportRule(TypesAreEqual(input0, input1), reasonIfUnsupported,
                                  "Reference maximum: input 0 and Input 1 types are mismatched");

    supported &= CheckSupportRule(TypesAreEqual(input0, output), reasonIfUnsupported,
                                  "Reference maximum: input and output types are mismatched");

    supported &= CheckSupportRule(ShapesAreBroadcastCompatible(input0, input1, output), reasonIfUnsupported,
                                  "Reference maximum: shapes are not suitable for implicit broadcast.");

    return supported;
}

bool RefLayerSupport::IsMeanSupported(const TensorInfo& input,
                                      const TensorInfo& output,
                                      const MeanDescriptor& descriptor,
                                      Optional<std::string&> reasonIfUnsupported) const
{
    bool supported = true;
    std::string meanLayerStr = "Mean";
    std::string outputTensorStr = "output";

    std::array<DataType,6> supportedTypes =
    {
        DataType::Float32,
        DataType::Float16,
        DataType::QAsymmS8,
        DataType::QAsymmU8,
        DataType::QSymmS16
    };

    supported &= CheckSupportRule(TypeAnyOf(input, supportedTypes), reasonIfUnsupported,
                                  "Reference Mean: input type not supported.");

    supported &= CheckSupportRule(TypesAreEqual(input, output), reasonIfUnsupported,
                                  "Reference Mean: input and output types are mismatched");

    if (descriptor.m_KeepDims)
    {
        supported &= CheckSupportRule(TensorNumDimensionsAreCorrect(output, input.GetNumDimensions()),
                                      reasonIfUnsupported,
                                      CreateIncorrectDimensionsErrorMsg(input.GetNumDimensions(),
                                                                        output.GetNumDimensions(),
                                                                        meanLayerStr, outputTensorStr).data());
    }
    else if (descriptor.m_Axis.empty())
    {
        supported &= CheckSupportRule(TensorNumDimensionsAreCorrect(output, 1),
                                      reasonIfUnsupported,
                                      CreateIncorrectDimensionsErrorMsg(1, output.GetNumDimensions(),
                                                                        meanLayerStr, outputTensorStr).data());
    }
    else
    {
        auto outputDim = input.GetNumDimensions() - armnn::numeric_cast<unsigned int>(descriptor.m_Axis.size());

        if (outputDim > 0)
        {
            supported &= CheckSupportRule(TensorNumDimensionsAreCorrect(output, outputDim),
                                          reasonIfUnsupported,
                                          CreateIncorrectDimensionsErrorMsg(outputDim, output.GetNumDimensions(),
                                                                            meanLayerStr, outputTensorStr).data());
        }
        else
        {
            supported &= CheckSupportRule(TensorNumDimensionsAreCorrect(output, 1),
                                          reasonIfUnsupported,
                                          CreateIncorrectDimensionsErrorMsg(1, output.GetNumDimensions(),
                                                                            meanLayerStr, outputTensorStr).data());
        }
    }

    return supported;
}

bool RefLayerSupport::IsMemCopySupported(const TensorInfo &input,
                                         const TensorInfo &output,
                                         Optional<std::string &> reasonIfUnsupported) const
{
    bool supported = true;

    std::array<DataType,7> supportedTypes =
    {
        DataType::BFloat16,
        DataType::Float32,
        DataType::Float16,
        DataType::QAsymmS8,
        DataType::QAsymmU8,
        DataType::QSymmS16,
        DataType::Boolean
    };

    supported &= CheckSupportRule(TypeAnyOf(input, supportedTypes), reasonIfUnsupported,
                                  "Reference MemCopy: input type not supported");

    supported &= CheckSupportRule(TypeAnyOf(output, supportedTypes), reasonIfUnsupported,
                                  "Reference MemCopy: output type not supported");

    supported &= CheckSupportRule(TypesAreEqual(input, output), reasonIfUnsupported,
                                  "Reference MemCopy: input and output types are mismatched");

    return supported;
}

bool RefLayerSupport::IsMinimumSupported(const TensorInfo& input0,
                                         const TensorInfo& input1,
                                         const TensorInfo& output,
                                         Optional<std::string&> reasonIfUnsupported) const
{
    bool supported = true;

    std::array<DataType,7> supportedTypes = {
        DataType::Float32,
        DataType::Float16,
        DataType::QAsymmS8,
        DataType::QAsymmU8,
        DataType::QSymmS16,
        DataType::Signed32
    };

    supported &= CheckSupportRule(TypeAnyOf(input0, supportedTypes), reasonIfUnsupported,
                                  "Reference minimum: input 0 is not a supported type.");

    supported &= CheckSupportRule(TypeAnyOf(input1, supportedTypes), reasonIfUnsupported,
                                  "Reference minimum: input 1 is not a supported type.");

    supported &= CheckSupportRule(TypeAnyOf(output, supportedTypes), reasonIfUnsupported,
                                  "Reference minimum: output is not a supported type.");

    supported &= CheckSupportRule(TypesAreEqual(input0, input1), reasonIfUnsupported,
                                  "Reference minimum: input 0 and Input 1 types are mismatched");

    supported &= CheckSupportRule(TypesAreEqual(input0, output), reasonIfUnsupported,
                                  "Reference minimum: input and output types are mismatched");

    supported &= CheckSupportRule(ShapesAreBroadcastCompatible(input0, input1, output), reasonIfUnsupported,
                                  "Reference minimum: shapes are not suitable for implicit broadcast.");

    return supported;
}

bool RefLayerSupport::IsMultiplicationSupported(const TensorInfo& input0,
                                                const TensorInfo& input1,
                                                const TensorInfo& output,
                                                Optional<std::string&> reasonIfUnsupported) const
{
    bool supported = true;

    std::array<DataType,7> supportedTypes = {
        DataType::Float32,
        DataType::Float16,
        DataType::QAsymmS8,
        DataType::QAsymmU8,
        DataType::QSymmS16,
        DataType::Signed32
    };

    supported &= CheckSupportRule(TypeAnyOf(input0, supportedTypes), reasonIfUnsupported,
                                  "Reference multiplication: input 0 is not a supported type.");

    supported &= CheckSupportRule(TypeAnyOf(input1, supportedTypes), reasonIfUnsupported,
                                  "Reference multiplication: input 1 is not a supported type.");

    supported &= CheckSupportRule(TypeAnyOf(output, supportedTypes), reasonIfUnsupported,
                                  "Reference multiplication: output is not a supported type.");

    supported &= CheckSupportRule(TypesAreEqual(input0, input1), reasonIfUnsupported,
                                  "Reference multiplication: input 0 and Input 1 types are mismatched");

    supported &= CheckSupportRule(TypesAreEqual(input0, output), reasonIfUnsupported,
                                  "Reference multiplication: input and output types are mismatched");

    supported &= CheckSupportRule(ShapesAreBroadcastCompatible(input0, input1, output), reasonIfUnsupported,
                                  "Reference multiplication: shapes are not suitable for implicit broadcast.");

    return supported;
}

bool RefLayerSupport::IsNormalizationSupported(const TensorInfo& input,
                                               const TensorInfo& output,
                                               const NormalizationDescriptor& descriptor,
                                               Optional<std::string&> reasonIfUnsupported) const
{
    IgnoreUnused(descriptor);

    // Define supported types
    std::array<DataType, 6> supportedTypes =
    {
        DataType::Float16,
        DataType::Float32,
        DataType::QAsymmS8,
        DataType::QAsymmU8,
        DataType::QSymmS16
    };

    bool supported = true;

    supported &= CheckSupportRule(TypeAnyOf(input, supportedTypes), reasonIfUnsupported,
                                  "Reference normalization: input type not supported.");

    supported &= CheckSupportRule(TypeAnyOf(output, supportedTypes), reasonIfUnsupported,
                                  "Reference normalization: output type not supported.");

    supported &= CheckSupportRule(ShapesAreSameTotalSize(input, output), reasonIfUnsupported,
                                  "Reference normalization: input and output shapes have different "
                                  "num total elements.");

    return supported;
}

bool RefLayerSupport::IsOutputSupported(const TensorInfo& /*output*/,
                                        Optional<std::string&> /*reasonIfUnsupported*/) const
{
    return true;
}

bool RefLayerSupport::IsPadSupported(const TensorInfo& input,
                                     const TensorInfo& output,
                                     const PadDescriptor& descriptor,
                                     Optional<std::string&> reasonIfUnsupported) const
{
    IgnoreUnused(descriptor);
    bool supported = true;

    // Define supported output and inputs types.
    std::array<DataType,6> supportedTypes =
    {
        DataType::Float32,
        DataType::Float16,
        DataType::QAsymmS8,
        DataType::QAsymmU8,
        DataType::QSymmS16
    };

    supported &= CheckSupportRule(TypeAnyOf(input, supportedTypes), reasonIfUnsupported,
                                  "Reference pad: input is not a supported type.");

    supported &= CheckSupportRule(TypeAnyOf(output, supportedTypes), reasonIfUnsupported,
                                  "Reference pad: output is not a supported type.");

    supported &= CheckSupportRule(TypesAreEqual(input, output), reasonIfUnsupported,
                                  "Reference pad: input and output types are mismatched.");

    return supported;
}

bool RefLayerSupport::IsPermuteSupported(const TensorInfo& input,
                                         const TensorInfo& output,
                                         const PermuteDescriptor& descriptor,
                                         Optional<std::string&> reasonIfUnsupported) const
{
    IgnoreUnused(descriptor);
    bool supported = true;

    // Define supported output and inputs types.
    std::array<DataType, 6> supportedTypes =
    {
        DataType::BFloat16,
        DataType::Float32,
        DataType::Float16,
        DataType::QAsymmS8,
        DataType::QAsymmU8,
        DataType::QSymmS16
    };

    supported &= CheckSupportRule(TypeAnyOf(input, supportedTypes), reasonIfUnsupported,
                                  "Reference permute: input is not a supported type.");

    supported &= CheckSupportRule(TypeAnyOf(output, supportedTypes), reasonIfUnsupported,
                                  "Reference permute: output is not a supported type.");

    supported &= CheckSupportRule(TypesAreEqual(input, output), reasonIfUnsupported,
                                  "Reference permute: input and output types are mismatched.");

    return supported;
}

bool RefLayerSupport::IsPooling2dSupported(const TensorInfo& input,
                                           const TensorInfo& output,
                                           const Pooling2dDescriptor& descriptor,
                                           Optional<std::string&> reasonIfUnsupported) const
{
    IgnoreUnused(descriptor);
    bool supported = true;

    // Define supported output and inputs types.
    std::array<DataType,6> supportedTypes =
    {
        DataType::Float32,
        DataType::Float16,
        DataType::QAsymmS8,
        DataType::QAsymmU8,
        DataType::QSymmS16
    };

    supported &= CheckSupportRule(TypeAnyOf(input, supportedTypes), reasonIfUnsupported,
                                  "Reference poolind2d: input is not a supported type.");

    supported &= CheckSupportRule(TypeAnyOf(output, supportedTypes), reasonIfUnsupported,
                                  "Reference poolind2d: output is not a supported type.");

    supported &= CheckSupportRule(TypesAreEqual(input, output), reasonIfUnsupported,
                                  "Reference poolind2d: input and output types are mismatched.");

    return supported;
}

bool RefLayerSupport::IsPooling3dSupported(const TensorInfo& input,
                                           const TensorInfo& output,
                                           const Pooling3dDescriptor& descriptor,
                                           Optional<std::string&> reasonIfUnsupported) const
{
    IgnoreUnused(descriptor);
    bool supported = true;

    // Define supported output and inputs types.
    std::array<DataType,6> supportedTypes =
    {
        DataType::Float32,
        DataType::Float16,
        DataType::QAsymmS8,
        DataType::QAsymmU8,
        DataType::QSymmS16
    };

    supported &= CheckSupportRule(TypeAnyOf(input, supportedTypes), reasonIfUnsupported,
                                  "Reference poolind3d: input is not a supported type.");

    supported &= CheckSupportRule(TypeAnyOf(output, supportedTypes), reasonIfUnsupported,
                                  "Reference poolind3d: output is not a supported type.");

    supported &= CheckSupportRule(TypesAreEqual(input, output), reasonIfUnsupported,
                                  "Reference poolind3d: input and output types are mismatched.");

    return supported;
}


bool RefLayerSupport::IsQLstmSupported(const TensorInfo& input,
                                       const TensorInfo& previousOutputIn,
                                       const TensorInfo& previousCellStateIn,
                                       const TensorInfo& outputStateOut,
                                       const TensorInfo& cellStateOut,
                                       const TensorInfo& output,
                                       const QLstmDescriptor& descriptor,
                                       const LstmInputParamsInfo& paramsInfo,
                                       Optional<std::string&> reasonIfUnsupported) const
{
    IgnoreUnused(input);
    IgnoreUnused(previousOutputIn);
    IgnoreUnused(previousCellStateIn);
    IgnoreUnused(outputStateOut);
    IgnoreUnused(cellStateOut);
    IgnoreUnused(output);
    IgnoreUnused(descriptor);
    IgnoreUnused(paramsInfo);

    IgnoreUnused(reasonIfUnsupported);

    return true;
}

bool RefLayerSupport::IsQuantizeSupported(const TensorInfo& input,
                                          const TensorInfo& output,
                                          Optional<std::string&> reasonIfUnsupported) const
{
   bool supported = true;

    // Define supported input types.
    std::array<DataType,7> supportedInputTypes = {
        DataType::Float32,
        DataType::Float16,
        DataType::QAsymmS8,
        DataType::QAsymmU8,
        DataType::QSymmS8,
        DataType::QSymmS16
    };

    supported &= CheckSupportRule(TypeAnyOf(input, supportedInputTypes), reasonIfUnsupported,
                                  "Reference quantize: input type not supported.");

    // Define supported output types.
    std::array<DataType,4> supportedOutputTypes = {
        DataType::QAsymmS8,
        DataType::QAsymmU8,
        DataType::QSymmS8,
        DataType::QSymmS16
    };
    supported &= CheckSupportRule(TypeAnyOf(output, supportedOutputTypes), reasonIfUnsupported,
                                  "Reference quantize: output type not supported.");

    supported &= CheckSupportRule(ShapesAreSameTotalSize(input, output), reasonIfUnsupported,
                                  "Reference quantize: input and output shapes have different num total elements.");

    return supported;
}

bool RefLayerSupport::IsRankSupported(const TensorInfo& input,
                                      const TensorInfo& output,
                                      Optional<std::string&> reasonIfUnsupported) const
{
    IgnoreUnused(input);
    // Define supported output types.
    std::array<DataType,1> supportedOutputTypes =
    {
        DataType::Signed32,
    };

    return CheckSupportRule(TypeAnyOf(output, supportedOutputTypes), reasonIfUnsupported,
           "Reference rank: input type not supported.");
}

bool RefLayerSupport::IsReduceSupported(const TensorInfo& input,
                                        const TensorInfo& output,
                                        const ReduceDescriptor& descriptor,
                                        Optional<std::string&> reasonIfUnsupported) const
{
    IgnoreUnused(descriptor);
    bool supported = true;
    std::array<DataType,7> supportedTypes =
    {
        DataType::Float32,
        DataType::Float16,
        DataType::QAsymmS8,
        DataType::QAsymmU8,
        DataType::QSymmS16,
        DataType::Signed32
    };

    supported &= CheckSupportRule(TypeAnyOf(input, supportedTypes), reasonIfUnsupported,
                                  "Reference Reduce: input type not supported");

    supported &= CheckSupportRule(TypeAnyOf(output, supportedTypes), reasonIfUnsupported,
                                  "Reference Reduce: output type not supported");

    supported &= CheckSupportRule(TypesAreEqual(input, output), reasonIfUnsupported,
                                  "Reference Reduce: input and output types not matching");

    return supported;
}

bool RefLayerSupport::IsReshapeSupported(const TensorInfo& input,
                                         const TensorInfo& output,
                                         const ReshapeDescriptor& descriptor,
                                         Optional<std::string&> reasonIfUnsupported) const
{
    IgnoreUnused(output);
    IgnoreUnused(descriptor);
    // Define supported output types.
    std::array<DataType,8> supportedOutputTypes =
    {
        DataType::BFloat16,
        DataType::Float32,
        DataType::Float16,
        DataType::Signed32,
        DataType::QAsymmS8,
        DataType::QAsymmU8,
        DataType::QSymmS16,
        DataType::Boolean
    };

    return CheckSupportRule(TypeAnyOf(input, supportedOutputTypes), reasonIfUnsupported,
        "Reference reshape: input type not supported.");
}

bool RefLayerSupport::IsResizeSupported(const TensorInfo& input,
                                        const TensorInfo& output,
                                        const ResizeDescriptor& descriptor,
                                        Optional<std::string&> reasonIfUnsupported) const
{
    IgnoreUnused(descriptor);
    bool supported = true;
    std::array<DataType,7> supportedTypes =
    {
        DataType::BFloat16,
        DataType::Float32,
        DataType::Float16,
        DataType::QAsymmS8,
        DataType::QAsymmU8,
        DataType::QSymmS8,
        DataType::QSymmS16
    };

    supported &= CheckSupportRule(TypeAnyOf(input, supportedTypes), reasonIfUnsupported,
                                  "Reference Resize: input type not supported");

    supported &= CheckSupportRule(TypeAnyOf(output, supportedTypes), reasonIfUnsupported,
                                  "Reference Resize: output type not supported");

    supported &= CheckSupportRule(TypesAreEqual(input, output), reasonIfUnsupported,
                                  "Reference Resize: input and output types not matching");

    return supported;
}

bool RefLayerSupport::IsReverseV2Supported(const TensorInfo& input0,
                                           const TensorInfo& input1,
                                           const TensorInfo& output,
                                           Optional<std::string&> reasonIfUnsupported) const
{
    bool supported = true;
    // ReverseV2 is data type agnostic so it can support all the types in the Reference backend
    std::array<DataType,8> supportedTypes =
    {
        DataType::BFloat16,
        DataType::Float32,
        DataType::Float16,
        DataType::QAsymmS8,
        DataType::QAsymmU8,
        DataType::QSymmS8,
        DataType::QSymmS16,
        DataType::Signed32
    };

    supported &= CheckSupportRule(TypeAnyOf(input0, supportedTypes), reasonIfUnsupported,
                                  "Reference ReverseV2: input0 type not supported");

    supported &= CheckSupportRule(TypeAnyOf(output, supportedTypes), reasonIfUnsupported,
                                  "Reference ReverseV2: output type not supported");

    supported &= CheckSupportRule(TypesAreEqual(input0, output), reasonIfUnsupported,
                                  "Reference ReverseV2: input0 and output types not matching");

    std::array<DataType,6> input2SupportedTypes =
    {
        DataType::Signed32
    };

    supported &= CheckSupportRule(TypeAnyOf(input1, input2SupportedTypes), reasonIfUnsupported,
                                  "Reference ReverseV2: input1 type not supported");

    return supported;
}

bool RefLayerSupport::IsScatterNdSupported(const TensorInfo& input,
                                           const TensorInfo& indices,
                                           const TensorInfo& updates,
                                           const TensorInfo& output,
                                           const ScatterNdDescriptor& descriptor,
                                            Optional<std::string&> reasonIfUnsupported) const
{
    IgnoreUnused(descriptor);

    bool supported = true;

    std::array<DataType, 7> supportedTypes
    {
        DataType::Float32,
        DataType::Float16,
        DataType::QAsymmS8,
        DataType::QAsymmU8,
        DataType::QSymmS8,
        DataType::QSymmS16,
        DataType::Signed32
    };

    std::array<DataType, 1> indicesSupportedTypes =
    {
        DataType::Signed32
    };

    supported &= CheckSupportRule(TypeAnyOf(indices, indicesSupportedTypes), reasonIfUnsupported,
                                  "ScatterNd: indices type not supported.");

    supported &= CheckSupportRule(TypeAnyOf(updates, supportedTypes), reasonIfUnsupported,
                                  "ScatterNd: updates type not supported.");

    supported &= CheckSupportRule(TypeAnyOf(output, supportedTypes), reasonIfUnsupported,
                                  "ScatterNd: output type not supported");

    supported &= CheckSupportRule(TypesAreEqual(updates, output), reasonIfUnsupported,
                                  "ScatterNd: input and updates types are mismatched");

    if (descriptor.m_InputEnabled)
    {
        // If the input slot is enabled, we have the input tensor in this slot
        supported &= CheckSupportRule(TypeAnyOf(input, supportedTypes), reasonIfUnsupported,
                                      "ScatterNd: input type not supported.");

        supported &= CheckSupportRule(TypesAreEqual(input, output), reasonIfUnsupported,
                                      "ScatterNd: input and output types are mismatched");
    }
    else
    {
        // If the input slot is not enabled, we have the shape tensor in this slot
        supported &= CheckSupportRule(TypeAnyOf(input, indicesSupportedTypes), reasonIfUnsupported,
                                      "ScatterNd: shape type not supported.");
    }

    return supported;
}

bool RefLayerSupport::IsShapeSupported(const TensorInfo& input,
                                       const TensorInfo& output,
                                       Optional<std::string&> reasonIfUnsupported) const
{
    IgnoreUnused(input);
    bool supported = true;

    std::array<DataType, 1> supportedTypes =
    {
        DataType::Signed32
    };

    supported &= CheckSupportRule(TypeAnyOf(output, supportedTypes), reasonIfUnsupported,
                                  "Reference Shape: output type not supported");

    return supported;
}

bool RefLayerSupport::IsSliceSupported(const TensorInfo& input,
                                       const TensorInfo& output,
                                       const SliceDescriptor& descriptor,
                                       Optional<std::string&> reasonIfUnsupported) const
{
    IgnoreUnused(descriptor);
    bool supported = true;

    std::array<DataType, 5> supportedTypes =
    {
        DataType::Float32,
        DataType::QAsymmS8,
        DataType::QAsymmU8,
        DataType::QSymmS16,
        DataType::Signed32
    };

    supported &= CheckSupportRule(TypeAnyOf(input, supportedTypes), reasonIfUnsupported,
                                  "Reference Slice: input type not supported");

    supported &= CheckSupportRule(TypeAnyOf(output, supportedTypes), reasonIfUnsupported,
                                  "Reference Slice: output type not supported");

    supported &= CheckSupportRule(TypesAreEqual(input, output), reasonIfUnsupported,
                                  "Reference Slice: input and output types are mismatched");

    return supported;
}

bool RefLayerSupport::IsSoftmaxSupported(const TensorInfo& input,
                                         const TensorInfo& output,
                                         const SoftmaxDescriptor& descriptor,
                                         Optional<std::string&> reasonIfUnsupported) const
{
    IgnoreUnused(descriptor);
    bool supported = true;
    std::array<DataType,7> supportedTypes =
    {
        DataType::Float32,
        DataType::Float16,
        DataType::QSymmS8,
        DataType::QAsymmS8,
        DataType::QAsymmU8,
        DataType::QSymmS16
    };

    supported &= CheckSupportRule(TypeAnyOf(input, supportedTypes), reasonIfUnsupported,
                                  "Reference Softmax: output type not supported");

    supported &= CheckSupportRule(TypeAnyOf(output, supportedTypes), reasonIfUnsupported,
                                  "Reference Softmax: input type not supported");

    supported &= CheckSupportRule(TypesAreEqual(input, output), reasonIfUnsupported,
                                  "Reference Softmax: input type not supported");

    return supported;
}

bool RefLayerSupport::IsSpaceToBatchNdSupported(const TensorInfo& input,
                                                const TensorInfo& output,
                                                const SpaceToBatchNdDescriptor& descriptor,
                                                Optional<std::string&> reasonIfUnsupported) const
{
    IgnoreUnused(descriptor);
    bool supported = true;
    std::array<DataType,6> supportedTypes =
    {
        DataType::Float32,
        DataType::Float16,
        DataType::QAsymmS8,
        DataType::QAsymmU8,
        DataType::QSymmS16
    };

    supported &= CheckSupportRule(TypeAnyOf(input, supportedTypes), reasonIfUnsupported,
                                  "Reference SpaceToBatchNd: input type not supported");

    supported &= CheckSupportRule(TypeAnyOf(output, supportedTypes), reasonIfUnsupported,
                                  "Reference SpaceToBatchNd: output type not supported");

    supported &= CheckSupportRule(TypesAreEqual(input, output), reasonIfUnsupported,
                                  "Reference SpaceToBatchNd: input and output types are mismatched");

    return supported;
}

bool RefLayerSupport::IsSpaceToDepthSupported(const TensorInfo& input,
                                              const TensorInfo& output,
                                              const SpaceToDepthDescriptor& descriptor,
                                              Optional<std::string&> reasonIfUnsupported) const
{

    IgnoreUnused(descriptor);
    bool supported = true;

    std::array<DataType,6> supportedTypes =
    {
        DataType::Float32,
        DataType::Float16,
        DataType::QAsymmS8,
        DataType::QAsymmU8,
        DataType::QSymmS16
    };

    supported &= CheckSupportRule(TypeAnyOf(input, supportedTypes), reasonIfUnsupported,
        "Reference SpaceToDepth: input type not supported");

    supported &= CheckSupportRule(TypeAnyOf(output, supportedTypes), reasonIfUnsupported,
        "Reference SpaceToDepth: output type not supported");

    supported &= CheckSupportRule(TypesAreEqual(input, output), reasonIfUnsupported,
        "Reference SpaceToDepth: input and output types are mismatched");

    return supported;
}

bool RefLayerSupport::IsSplitterSupported(const TensorInfo& input,
                                          const std::vector<std::reference_wrapper<TensorInfo>>& outputs,
                                          const ViewsDescriptor& descriptor,
                                          Optional<std::string&> reasonIfUnsupported) const
{
    IgnoreUnused(descriptor);
    bool supported = true;
    std::array<DataType,6> supportedTypes =
    {
        DataType::Float32,
        DataType::Float16,
        DataType::QAsymmS8,
        DataType::QAsymmU8,
        DataType::QSymmS16
    };

    supported &= CheckSupportRule(TypeAnyOf(input, supportedTypes), reasonIfUnsupported,
                                  "Reference splitter: output type not supported");
    for (const TensorInfo& output : outputs)
    {
        supported &= CheckSupportRule(TypeAnyOf(input, supportedTypes), reasonIfUnsupported,
                                      "Reference splitter: input type not supported");

        supported &= CheckSupportRule(TypesAreEqual(input, output), reasonIfUnsupported,
                                      "Reference splitter: input and output types mismatched.");
    }

    return supported;
}

bool RefLayerSupport::IsStackSupported(const std::vector<const TensorInfo*>& inputs,
                                       const TensorInfo& output,
                                       const StackDescriptor& descriptor,
                                       Optional<std::string&> reasonIfUnsupported) const
{
    IgnoreUnused(descriptor);

    bool supported = true;
    std::array<DataType,7> supportedTypes =
    {
        DataType::Float32,
        DataType::Float16,
        DataType::QAsymmS8,
        DataType::QAsymmU8,
        DataType::QSymmS16,
        DataType::Signed32
    };

    supported &= CheckSupportRule(TypeAnyOf(output, supportedTypes), reasonIfUnsupported,
                                  "Reference stack: output type not supported");
    for (const TensorInfo* input : inputs)
    {
        supported &= CheckSupportRule(TypeAnyOf(*input, supportedTypes), reasonIfUnsupported,
            "Reference stack: input type not supported");

        supported &= CheckSupportRule(TypesAreEqual(*input, output), reasonIfUnsupported,
            "Reference stack: input and output types mismatched.");
    }

    return supported;
}

bool RefLayerSupport::IsStridedSliceSupported(const TensorInfo& input,
                                              const TensorInfo& output,
                                              const StridedSliceDescriptor& descriptor,
                                              Optional<std::string&> reasonIfUnsupported) const
{
    IgnoreUnused(descriptor);
    bool supported = true;

    std::array<DataType,5> supportedTypes =
    {
        DataType::Float32,
        DataType::QAsymmS8,
        DataType::QAsymmU8,
        DataType::QSymmS16
    };

    supported &= CheckSupportRule(TypeAnyOf(input, supportedTypes), reasonIfUnsupported,
                                  "Reference StridedSlice: input type not supported");

    supported &= CheckSupportRule(TypeAnyOf(output, supportedTypes), reasonIfUnsupported,
                                  "Reference StridedSlice: output type not supported");

    supported &= CheckSupportRule(TypesAreEqual(input, output), reasonIfUnsupported,
                                  "Reference StridedSlice: input and output types are mismatched");

    return supported;
}

bool RefLayerSupport::IsSubtractionSupported(const TensorInfo& input0,
                                             const TensorInfo& input1,
                                             const TensorInfo& output,
                                             Optional<std::string&> reasonIfUnsupported) const
{
    bool supported = true;

    std::array<DataType,7> supportedTypes = {
        DataType::Float32,
        DataType::Float16,
        DataType::QAsymmS8,
        DataType::QAsymmU8,
        DataType::QSymmS16,
        DataType::Signed32
    };

    supported &= CheckSupportRule(TypeAnyOf(input0, supportedTypes), reasonIfUnsupported,
                                  "Reference subtraction: input 0 is not a supported type.");

    supported &= CheckSupportRule(TypeAnyOf(input1, supportedTypes), reasonIfUnsupported,
                                  "Reference subtraction: input 1 is not a supported type.");

    supported &= CheckSupportRule(TypeAnyOf(output, supportedTypes), reasonIfUnsupported,
                                  "Reference subtraction: output is not a supported type.");

    supported &= CheckSupportRule(TypesAreEqual(input0, input1), reasonIfUnsupported,
                                  "Reference subtraction: input 0 and Input 1 types are mismatched");

    supported &= CheckSupportRule(TypesAreEqual(input0, output), reasonIfUnsupported,
                                  "Reference subtraction: input and output types are mismatched");

    supported &= CheckSupportRule(ShapesAreBroadcastCompatible(input0, input1, output), reasonIfUnsupported,
                                  "Reference subtraction: shapes are not suitable for implicit broadcast.");

    return supported;
}

bool RefLayerSupport::IsPreluSupported(const TensorInfo& input,
                                       const TensorInfo& alpha,
                                       const TensorInfo& output,
                                       Optional<std::string&> reasonIfUnsupported) const
{
    bool supported = true;

    std::array<DataType, 6> supportedTypes
    {
        DataType::Float32,
        DataType::Float16,
        DataType::QAsymmS8,
        DataType::QAsymmU8,
        DataType::QSymmS16
    };

    supported &= CheckSupportRule(TypeAnyOf(input, supportedTypes), reasonIfUnsupported,
                                  "PReLU: input is not a supported type.");

    supported &= CheckSupportRule(TypeAnyOf(alpha, supportedTypes), reasonIfUnsupported,
                                  "PReLU: alpha is not a supported type.");

    supported &= CheckSupportRule(TypeAnyOf(output, supportedTypes), reasonIfUnsupported,
                                  "PReLU: output is not a supported type.");

    supported &= CheckSupportRule(TypesAreEqual(input, alpha, output), reasonIfUnsupported,
                                  "PReLU: input, alpha and output types are mismatched");

    supported &= CheckSupportRule(ShapesAreBroadcastCompatible(input, alpha, output), reasonIfUnsupported,
                                  "PReLU: shapes are not suitable for implicit broadcast");

    return supported;
}

bool RefLayerSupport::IsTileSupported(const TensorInfo& input,
                                      const TensorInfo& output,
                                      const TileDescriptor& descriptor,
                                      Optional<std::string&> reasonIfUnsupported) const
{
    IgnoreUnused(descriptor);

    bool supported = true;

    std::array<DataType, 7> supportedTypes
    {
        DataType::Float32,
        DataType::Float16,
        DataType::QAsymmS8,
        DataType::QAsymmU8,
        DataType::QSymmS8,
        DataType::QSymmS16,
        DataType::Signed32
    };

    supported &= CheckSupportRule(TypeAnyOf(input, supportedTypes), reasonIfUnsupported,
                                  "Tile: input type not supported.");

    supported &= CheckSupportRule(TypeAnyOf(output, supportedTypes), reasonIfUnsupported,
                                  "Tile: output type not supported");

    return supported;
}

bool RefLayerSupport::IsTransposeConvolution2dSupported(const TensorInfo& input,
                                                        const TensorInfo& output,
                                                        const TransposeConvolution2dDescriptor& descriptor,
                                                        const TensorInfo& weights,
                                                        const Optional<TensorInfo>& biases,
                                                        Optional<std::string&> reasonIfUnsupported) const
{
    IgnoreUnused(descriptor);
    bool supported = true;

    std::array<DataType,7> supportedTypes =
    {
        DataType::Float32,
        DataType::Float16,
        DataType::QAsymmS8,
        DataType::QAsymmU8,
        DataType::QSymmS8,
        DataType::QSymmS16
    };

    supported &= CheckSupportRule(TypeAnyOf(input, supportedTypes), reasonIfUnsupported,
                                  "Reference TransposeConvolution2d: input is not a supported type.");

    supported &= CheckSupportRule(TypeAnyOf(output, supportedTypes), reasonIfUnsupported,
                                  "Reference TransposeConvolution2d: output is not a supported type.");

    supported &= CheckSupportRule(TypesAreEqual(input, output), reasonIfUnsupported,
                                  "Reference TransposeConvolution2d: input and output types mismatched.");


    const DataType inputType = input.GetDataType();
    if (IsQuantized8BitType(inputType))
    {
        std::array<DataType, 3> supportedWeightTypes =
        {
            DataType::QAsymmS8,
            DataType::QAsymmU8,
            DataType::QSymmS8
        };

        supported &= CheckSupportRule(TypeAnyOf(weights, supportedWeightTypes), reasonIfUnsupported,
                                      "Reference TransposeConvolution2d: weights type not supported for "
                                      "quantized input.");
    }
    else
    {
        supported &= CheckSupportRule(TypeAnyOf(weights, supportedTypes), reasonIfUnsupported,
                                    "Reference TransposeConvolution2d: weights is not a supported type.");

        supported &= CheckSupportRule(TypesAreEqual(input, weights), reasonIfUnsupported,
                                    "Reference TransposeConvolution2d: input and weights types mismatched.");
    }

    if (biases.has_value())
    {
        std::array<DataType,4> biasesSupportedTypes =
        {
            DataType::Float32,
            DataType::Float16,
            DataType::Signed32
        };
        supported &= CheckSupportRule(TypeAnyOf(biases.value(), biasesSupportedTypes), reasonIfUnsupported,
                                      "Reference TransposeConvolution2d: biases is not a supported type.");
    }

    return supported;
}

bool RefLayerSupport::IsTransposeSupported(const TensorInfo& input,
                                           const TensorInfo& output,
                                           const TransposeDescriptor& descriptor,
                                           Optional<std::string&> reasonIfUnsupported) const
{
    IgnoreUnused(descriptor);
    bool supported = true;

    // Define supported output and inputs types.
    std::array<DataType, 6> supportedTypes =
    {
        DataType::BFloat16,
        DataType::Float32,
        DataType::Float16,
        DataType::QAsymmS8,
        DataType::QAsymmU8,
        DataType::QSymmS16
    };

    supported &= CheckSupportRule(TypeAnyOf(input, supportedTypes), reasonIfUnsupported,
                                  "Reference transpose: input is not a supported type.");

    supported &= CheckSupportRule(TypeAnyOf(output, supportedTypes), reasonIfUnsupported,
                                  "Reference transpose: output is not a supported type.");

    supported &= CheckSupportRule(TypesAreEqual(input, output), reasonIfUnsupported,
                                  "Reference transpose: input and output types are mismatched.");

    return supported;
}

bool RefLayerSupport::IsUnidirectionalSequenceLstmSupported(
        const TensorInfo& input,
        const TensorInfo& outputStateIn,
        const TensorInfo& cellStateIn,
        const TensorInfo& outputStateOut,
        const TensorInfo& cellStateOut,
        const TensorInfo& output,
        const UnidirectionalSequenceLstmDescriptor& descriptor,
        const LstmInputParamsInfo& paramsInfo,
        Optional<std::string&> reasonIfUnsupported) const
{
    IgnoreUnused(descriptor);
    IgnoreUnused(paramsInfo);
    IgnoreUnused(outputStateIn);
    IgnoreUnused(cellStateIn);
    IgnoreUnused(outputStateOut);
    IgnoreUnused(cellStateOut);
    bool supported = true;

    std::array<DataType, 2> supportedTypes =
    {
        DataType::Float32,
        DataType::QAsymmS8
    };

    std::array<DataType, 2> supportedWeightTypes =
    {
        DataType::Float32,
        DataType::QAsymmS8
    };

    std::array<DataType, 3> supportedBiasTypes =
    {
        DataType::Float32,
        DataType::QAsymmS8,
        DataType::Signed32
    };

    // check inputs and outputs
    supported &= CheckSupportRule(TypeAnyOf(input, supportedTypes), reasonIfUnsupported,
                                  "Reference UnidirectionalSequenceLstm: input is not a supported type.");
    supported &= CheckSupportRule(TypeAnyOf(output, supportedTypes), reasonIfUnsupported,
                                  "Reference UnidirectionalSequenceLstm: output is not a supported type.");

    // check layer parameters
    supported &= CheckSupportRule(TypeAnyOf(paramsInfo.GetInputToForgetWeights(), supportedWeightTypes),
                                  reasonIfUnsupported,
                                  "Reference UnidirectionalSequenceLstm: InputToForgetWeights "
                                  "is not a supported type.");
    supported &= CheckSupportRule(TypeAnyOf(paramsInfo.GetInputToCellWeights(), supportedWeightTypes),
                                  reasonIfUnsupported,
                                  "Reference UnidirectionalSequenceLstm: InputToCellWeights is not a supported type.");
    supported &= CheckSupportRule(TypeAnyOf(paramsInfo.GetInputToOutputWeights(), supportedWeightTypes),
                                  reasonIfUnsupported,
                                  "Reference UnidirectionalSequenceLstm: InputToOutputWeights "
                                  "is not a supported type.");
    supported &= CheckSupportRule(TypeAnyOf(paramsInfo.GetRecurrentToForgetWeights(), supportedWeightTypes),
                                  reasonIfUnsupported,
                                  "Reference UnidirectionalSequenceLstm: RecurrentToForgetWeights "
                                  "is not a supported type.");
    supported &= CheckSupportRule(TypeAnyOf(paramsInfo.GetRecurrentToCellWeights(), supportedWeightTypes),
                                  reasonIfUnsupported,
                                  "Reference UnidirectionalSequenceLstm: RecurrentToCellWeights "
                                  "is not a supported type.");
    supported &= CheckSupportRule(TypeAnyOf(paramsInfo.GetRecurrentToOutputWeights(), supportedWeightTypes),
                                  reasonIfUnsupported,
                                  "Reference UnidirectionalSequenceLstm: RecurrentToOutputWeights "
                                  "is not a supported type.");

    supported &= CheckSupportRule(TypeAnyOf(paramsInfo.GetForgetGateBias(), supportedBiasTypes), reasonIfUnsupported,
                                  "Reference UnidirectionalSequenceLstm: ForgetGateBias is not a supported type.");
    supported &= CheckSupportRule(TypeAnyOf(paramsInfo.GetCellBias(), supportedBiasTypes), reasonIfUnsupported,
                                  "Reference UnidirectionalSequenceLstm: CellBias is not a supported type.");
    supported &= CheckSupportRule(TypeAnyOf(paramsInfo.GetOutputGateBias(), supportedBiasTypes), reasonIfUnsupported,
                                  "Reference UnidirectionalSequenceLstm: OutputGateBias is not a supported type.");
    if (!descriptor.m_CifgEnabled)
    {
        supported &= CheckSupportRule(TypeAnyOf(paramsInfo.GetInputToInputWeights(), supportedWeightTypes),
                                      reasonIfUnsupported,
                                      "Reference UnidirectionalSequenceLstm: InputToInputWeights "
                                      "is not a supported type.");
        supported &= CheckSupportRule(TypeAnyOf(paramsInfo.GetRecurrentToInputWeights(), supportedWeightTypes),
                                      reasonIfUnsupported,
                                      "Reference UnidirectionalSequenceLstm: RecurrentToInputWeights "
                                      "is not a supported type.");
        supported &= CheckSupportRule(TypeAnyOf(paramsInfo.GetInputGateBias(), supportedBiasTypes), reasonIfUnsupported,
                                      "Reference UnidirectionalSequenceLstm: InputGateBias is not a supported type.");
        if (descriptor.m_PeepholeEnabled)
        {
            supported &= CheckSupportRule(TypeAnyOf(paramsInfo.GetCellToInputWeights(), supportedWeightTypes),
                                          reasonIfUnsupported,
                                          "Reference UnidirectionalSequenceLstm: CellToInputWeights "
                                          "is not a supported type.");
        }
    }
    if (descriptor.m_PeepholeEnabled)
    {
        supported &= CheckSupportRule(TypeAnyOf(paramsInfo.GetCellToForgetWeights(), supportedWeightTypes),
                                      reasonIfUnsupported,
                                      "Reference UnidirectionalSequenceLstm: CellToForgetWeights "
                                      "is not a supported type.");
        supported &= CheckSupportRule(TypeAnyOf(paramsInfo.GetCellToOutputWeights(), supportedWeightTypes),
                                      reasonIfUnsupported,
                                      "Reference UnidirectionalSequenceLstm: CellToOutputWeights "
                                      "is not a supported type.");
    }
    if (descriptor.m_ProjectionEnabled)
    {
        supported &= CheckSupportRule(TypeAnyOf(paramsInfo.GetProjectionWeights(), supportedWeightTypes),
                                      reasonIfUnsupported,
                                      "Reference UnidirectionalSequenceLstm: ProjectionWeights "
                                      "is not a supported type.");
        if (paramsInfo.m_ProjectionBias != nullptr)
        {
            supported &= CheckSupportRule(TypesAreEqual(input, paramsInfo.GetProjectionBias()), reasonIfUnsupported,
                                          "Reference UnidirectionalSequenceLstm: input and ProjectionBias types "
                                          "are mismatched");
        }
    }
    if (descriptor.m_LayerNormEnabled)
    {
        if (!descriptor.m_CifgEnabled)
        {
            supported &= CheckSupportRule(TypeAnyOf(paramsInfo.GetInputLayerNormWeights(), supportedWeightTypes),
                                          reasonIfUnsupported,
                                          "Reference UnidirectionalSequenceLstm: InputLayerNormWeights "
                                          "is not a supported type.");
        }
        supported &= CheckSupportRule(TypeAnyOf(paramsInfo.GetForgetLayerNormWeights(), supportedWeightTypes),
                                      reasonIfUnsupported,
                                      "Reference UnidirectionalSequenceLstm: ForgetLayerNormWeights "
                                      "is not a supported type.");
        supported &= CheckSupportRule(TypeAnyOf(paramsInfo.GetCellLayerNormWeights(), supportedWeightTypes),
                                      reasonIfUnsupported,
                                      "Reference UnidirectionalSequenceLstm: CellLayerNormWeights "
                                      "is not a supported type.");
        supported &= CheckSupportRule(TypeAnyOf(paramsInfo.GetOutputLayerNormWeights(), supportedWeightTypes),
                                      reasonIfUnsupported,
                                      "Reference UnidirectionalSequenceLstm: OutputLayerNormWeights "
                                      "is not a supported type.");
    }

    return supported;
}

} // namespace armnn