src/backends/backendsCommon/WorkloadData.cpp

//
// Copyright © 2017 Arm Ltd. All rights reserved.
// SPDX-License-Identifier: MIT
//
#include "WorkloadData.hpp"

#include "CpuTensorHandle.hpp"

#include <DataLayoutIndexed.hpp>

#include <algorithm>
#include <iomanip>
#include <string>
#include <sstream>

#include <boost/format.hpp>
#include <boost/numeric/conversion/cast.hpp>

using namespace armnnUtils;

namespace armnn
{

//---------------------------------------------------------------
DataType GetBiasDataType(DataType inputDataType)
{
    switch (inputDataType)
    {
        case DataType::Float16:
            return DataType::Float16;
        case DataType::Float32:
            return DataType::Float32;
        case DataType::QuantisedAsymm8:
            return DataType::Signed32;
        case DataType::QuantisedSymm16:
            return DataType::Signed32;
        default:
            BOOST_ASSERT_MSG(false, "Invalid input data type");
            return DataType::Float32;
    }
}

namespace
{

//---------------------------------------------------------------
//android ndk does not support std::to_string function.
template <typename T>
std::string to_string(T value)
{
    std::ostringstream os;
    os << value;
    return os.str();
}

//---------------------------------------------------------------
void ValidatePointer(const void* ptr, std::string const& descName, std::string const& paramName)
{
    if (!ptr)
    {
        throw InvalidArgumentException(descName +  ": Invalid null pointer. The " +
                                      paramName + " parameter must be set.");
    }
}

//---------------------------------------------------------------
void ValidateTensorShapesMatch(const TensorInfo& first,
                               const TensorInfo& second,
                               std::string const& descName,
                               std::string const& firstName,
                               std::string const& secondName)
{
    if (first.GetShape() != second.GetShape())
    {
        throw InvalidArgumentException(descName + ": "
                                       + firstName + " & " + secondName + " must have identical shapes");
    }
}

//---------------------------------------------------------------
void ValidateNumInputs(const WorkloadInfo& workloadInfo, std::string const& descName, const unsigned int expectedSize)
{
    if (workloadInfo.m_InputTensorInfos.size() != expectedSize)
    {
        throw InvalidArgumentException(descName +
                                       ": Requires exactly " + to_string(expectedSize) + "input(s). " +
                                       to_string(workloadInfo.m_InputTensorInfos.size()) + " have been provided.");
    }
}

//---------------------------------------------------------------
void ValidateNumOutputs(const WorkloadInfo& workloadInfo, std::string const& descName, const unsigned int expectedSize)
{
    if (workloadInfo.m_OutputTensorInfos.size() != expectedSize)
    {
        throw InvalidArgumentException(descName +
                                       ": Requires exactly " + to_string(expectedSize) + " output(s). " +
                                       to_string(workloadInfo.m_OutputTensorInfos.size()) + " has been provided.");
    }
}

//---------------------------------------------------------------
void ValidateTensorNumDimensions(const TensorInfo& tensor,
                                 std::string const& descName,
                                 unsigned int numDimensions,
                                 std::string const& tensorName)
{
    if (tensor.GetNumDimensions() != numDimensions)
    {
        throw InvalidArgumentException(descName + ": Expected " + to_string(numDimensions) + " but got " +
            to_string(tensor.GetNumDimensions()) + " dimensions for " +
            tensorName + " tensor.");
    }
}

//---------------------------------------------------------------
void ValidateTensorNumElements(const TensorInfo& tensor,
                               std::string const& descName,
                               unsigned int numElements,
                               std::string const& tensorName)
{
    if (tensor.GetNumElements() != numElements)
    {
        throw InvalidArgumentException(descName + ": Expected " + to_string(numElements) + " but got " +
                                       to_string(tensor.GetNumDimensions()) + " elements for " +
                                       tensorName + " tensor.");
    }
}

//---------------------------------------------------------------
void ValidateTensorNumDimNumElem(const TensorInfo& tensorInfo,
                                 unsigned int numDimension,
                                 unsigned int numElements,
                                 std::string const& tensorName)
{
    const std::string functionName{"ValidateTensorNumDimNumElem"};
    ValidateTensorNumDimensions(tensorInfo, functionName, numDimension, tensorName);
    ValidateTensorNumElements(tensorInfo, functionName, numElements, tensorName);
}

//---------------------------------------------------------------
void ValidateTensorDataType(const TensorInfo& tensor, DataType dataType,
    const std::string& descName, std::string const& tensorName)
{
    if (tensor.GetDataType() != dataType)
    {
        throw InvalidArgumentException(descName + ": Expected data type " + GetDataTypeName(dataType) + " but got " +
            GetDataTypeName(tensor.GetDataType()) + " for " + tensorName + " tensor.");
    }
}

//---------------------------------------------------------------
void ValidateTensorQuantizationSpace(const TensorInfo& first,
                                     const TensorInfo& second,
                                     const std::string& descName,
                                     std::string const& firstName,
                                     std::string const& secondName)
{
    if (!first.IsQuantized() ||
        !second.IsQuantized())
    {
        // Not a quantized type, ignore the validation
        return;
    }

    DataType firstDataType  = first.GetDataType();
    DataType secondDataType = second.GetDataType();

    if (firstDataType != secondDataType)
    {
        throw InvalidArgumentException(descName + ": " + firstName + " and " + secondName +
                                       " must be of the same quantized type, " +
                                       firstName + " is " + GetDataTypeName(firstDataType) + ", " +
                                       secondName + " is " + GetDataTypeName(secondDataType));
    }

    if (!first.IsTypeSpaceMatch(second))
    {
        throw InvalidArgumentException(descName + ": " + firstName + " and " + secondName +
                                       " must have the same quantization space, " +
                                       firstName + " has offset " + to_string(first.GetQuantizationOffset()) +
                                       " and scale " + to_string(first.GetQuantizationScale()) + ", " +
                                       secondName + " has offset " + to_string(second.GetQuantizationOffset()) +
                                       " and scale " + to_string(second.GetQuantizationScale()));
    }
}

//---------------------------------------------------------------
void ValidateBiasTensorQuantization(const TensorInfo& biasTensor,
                                    const TensorInfo& inputTensorInfo,
                                    const TensorInfo& weightsTensorInfo,
                                    const std::string& descName)
{
    if (biasTensor.GetQuantizationOffset() != 0)
    {
        throw InvalidArgumentException(descName + ": Expected zero quantization offset for bias tensor but got " +
            to_string(biasTensor.GetQuantizationOffset()));
    }
    const float expectedScale = inputTensorInfo.GetQuantizationScale() * weightsTensorInfo.GetQuantizationScale();
    if (std::abs(biasTensor.GetQuantizationScale() - expectedScale) > 0.00000001f)
    {
        // Print the float values with extra precision to see very small differences
        std::stringstream msg;
        msg << std::setprecision(10) << descName << ": Expected " << expectedScale <<
            " quantization scale for bias tensor (the product of the input and weight scales), but got " <<
            biasTensor.GetQuantizationScale();
        throw InvalidArgumentException(msg.str());
    }
}

//---------------------------------------------------------------
void ValidateTensors(const std::vector<ITensorHandle*>& vec,
    unsigned int numExpected,
    const std::string& descName,
    const std::string& varName)
{
    if (vec.empty() && numExpected > 0)
    {
        throw InvalidArgumentException(descName + ": Invalid empty " + varName + " array.");
    }

    for (unsigned int i = 0; i < numExpected; ++i)
    {
        if (!vec[i])
        {
            throw InvalidArgumentException(descName + ": Invalid NULL for " + varName + to_string(i));
        }
    }
}

//---------------------------------------------------------------
void ValidateBroadcastTensorShapesMatch(const TensorInfo& first,
                                        const TensorInfo& second,
                                        const TensorInfo& output,
                                        std::string const& descName,
                                        std::string const& firstName,
                                        std::string const& secondName)
{
    // Tensors must have the same number of dimensions in order to be explicit about which dimensions will get
    // broadcasted.
    if (first.GetNumDimensions() != second.GetNumDimensions())
    {
        throw InvalidArgumentException(descName  + ": Tensors "
            + firstName + " & " + secondName
            + " must have the same number of dimensions in order to be broadcasted");
    }
    uint32_t numDims = first.GetNumDimensions();
    std::vector<uint32_t> outputDims(numDims, 0u);
    for (uint32_t i = 0; i < numDims; i++)
    {
        const bool dimsNotEqual = first.GetShape()[i] != second.GetShape()[i];
        const bool dimsNotOne = (first.GetShape()[i] != 1) && (second.GetShape()[i] != 1);
        if (dimsNotEqual && dimsNotOne)
        {
            throw InvalidArgumentException("Broadcasting is not possible for incompatible shapes");
        }
        outputDims[i] = std::max(first.GetShape()[i], second.GetShape()[i]);
    }
    TensorShape broadcastShape = TensorShape(boost::numeric_cast<unsigned int>(outputDims.size()), outputDims.data());
    if (broadcastShape != output.GetShape())
    {
        throw InvalidArgumentException(descName + ": The tensor shape resulting from adding "
                                       + firstName + " & " + secondName
                                       + " does not match the output shape");
    }
}

//---------------------------------------------------------------
void ValidateDataTypes(const TensorInfo& info,
                       const std::vector<armnn::DataType>& supportedTypes,
                       std::string const& descName)
{
    auto iterator = std::find(supportedTypes.begin(), supportedTypes.end(), info.GetDataType());
    if (iterator == supportedTypes.end())
    {
        throw InvalidArgumentException(descName  + ": " + " Tensor type is not supported.");
    }
}

//---------------------------------------------------------------
void ValidateTensorDataTypesMatch(const TensorInfo& first,
                                  const TensorInfo& second,
                                  std::string const& descName,
                                  std::string const& firstName,
                                  std::string const& secondName)
{
    if (first.GetDataType() != second.GetDataType())
    {
        throw InvalidArgumentException(descName + ": " + firstName + " & " + secondName +
                                       " must have identical data types.");
    }
}

//---------------------------------------------------------------
void ValidateTensorNumElementsMatch(const TensorInfo& first,
                                    const TensorInfo& second,
                                    std::string const& descName,
                                    std::string const& firstName,
                                    std::string const& secondName)
{
    if (first.GetNumElements() != second.GetNumElements())
    {
        throw InvalidArgumentException(descName + ": " + firstName + " & " + secondName +
                                       " must have the same number of elements.");
    }
}

} // anonymous namespace

void QueueDescriptor::ValidateInputsOutputs(const std::string& descName,
    unsigned int numExpectedIn, unsigned int numExpectedOut) const
{
    ValidateTensors(m_Inputs, numExpectedIn, descName, "input");
    ValidateTensors(m_Outputs, numExpectedOut, descName, "output");
}

//---------------------------------------------------------------
void MemCopyQueueDescriptor::Validate(const WorkloadInfo& workloadInfo) const
{
    const std::string descriptorName{"MemCopyQueueDescriptor"};

    ValidateNumInputs(workloadInfo,  descriptorName, 1);
    ValidateNumOutputs(workloadInfo, descriptorName , 1);

    const TensorInfo& inputTensorInfo  = workloadInfo.m_InputTensorInfos[0];
    const TensorInfo& outputTensorInfo = workloadInfo.m_OutputTensorInfos[0];

    ValidateTensorNumElementsMatch(inputTensorInfo, outputTensorInfo, descriptorName, "input", "output");
    ValidateTensorDataTypesMatch(inputTensorInfo, outputTensorInfo, descriptorName, "input", "output");

    if (m_Inputs.size() != m_Outputs.size())
    {
        throw InvalidArgumentException(boost::str(
            boost::format("%1%: Number of inputs (%2%) does not match the number of outputs (%3%).") %
                          descriptorName % m_Inputs.size() % m_Outputs.size()));
    }

    for (unsigned int i = 0; i < m_Inputs.size(); ++i)
    {
        if (!m_Inputs[i])
        {
            throw InvalidArgumentException(boost::str(boost::format("%1%: Invalid NULL input %2%.") %
                                                      descriptorName % i));
        }

        if (!m_Outputs[i])
        {
            throw InvalidArgumentException(boost::str(boost::format("%1%: Invalid NULL output %2%") %
                                                      descriptorName % i));
        }
    }
}

void ActivationQueueDescriptor::Validate(const WorkloadInfo& workloadInfo) const
{
    const std::string descriptorName{"ActivationQueueDescriptor"};

    ValidateNumInputs(workloadInfo,  descriptorName, 1);
    ValidateNumOutputs(workloadInfo, descriptorName, 1);

    const TensorInfo& inputTensorInfo  = workloadInfo.m_InputTensorInfos[0];
    const TensorInfo& outputTensorInfo = workloadInfo.m_OutputTensorInfos[0];

    std::vector<DataType> supportedTypes =
    {
            DataType::Float16,
            DataType::Float32,
            DataType::QuantisedAsymm8,
            DataType::QuantisedSymm16
    };

    ValidateDataTypes(inputTensorInfo, supportedTypes, descriptorName);
    ValidateTensorDataTypesMatch(inputTensorInfo, outputTensorInfo, descriptorName, "input", "output");
    ValidateTensorShapesMatch(inputTensorInfo, outputTensorInfo, descriptorName, "input", "output");
}

void SoftmaxQueueDescriptor::Validate(const WorkloadInfo& workloadInfo) const
{
    const std::string descriptorName{"SoftmaxQueueDescriptor"};

    ValidateNumInputs(workloadInfo,  descriptorName, 1);
    ValidateNumOutputs(workloadInfo, descriptorName, 1);

    const TensorInfo& inputTensorInfo  = workloadInfo.m_InputTensorInfos[0];
    const TensorInfo& outputTensorInfo = workloadInfo.m_OutputTensorInfos[0];

    std::vector<DataType> supportedTypes =
    {
            DataType::Float16,
            DataType::Float32,
            DataType::QuantisedAsymm8,
            DataType::QuantisedSymm16
    };

    ValidateDataTypes(inputTensorInfo, supportedTypes, descriptorName);
    ValidateTensorDataTypesMatch(inputTensorInfo, outputTensorInfo, descriptorName, "input", "output");
    ValidateTensorShapesMatch(inputTensorInfo, outputTensorInfo, descriptorName, "input", "output");
}

void SplitterQueueDescriptor::Validate(const WorkloadInfo& workloadInfo) const
{
    const std::string descriptorName{"SplitterQueueDescriptor"};

    ValidateNumInputs(workloadInfo, descriptorName, 1);

    // Check the supported data types
    std::vector<DataType> supportedTypes =
    {
            DataType::Float32,
            DataType::Float16,
            DataType::Boolean,
            DataType::Signed32,
            DataType::QuantisedAsymm8,
            DataType::QuantisedSymm16
    };

    const TensorInfo& inputTensorInfo = workloadInfo.m_InputTensorInfos[0];
    for (unsigned long i = 0ul; i < workloadInfo.m_OutputTensorInfos.size(); ++i)
    {
        const TensorInfo& outputTensorInfo = workloadInfo.m_OutputTensorInfos[i];
        ValidateDataTypes(outputTensorInfo, supportedTypes, descriptorName);

        const std::string outputName = "output_" + std::to_string(i);
        ValidateTensorDataTypesMatch(inputTensorInfo, outputTensorInfo, descriptorName, "input", outputName);
    }

    if (workloadInfo.m_OutputTensorInfos.size() <= 0)
    {
        throw InvalidArgumentException(descriptorName + ": At least one output needs to be provided.");
    }

    if (workloadInfo.m_OutputTensorInfos.size() != m_ViewOrigins.size())
    {
        throw InvalidArgumentException(
            descriptorName + ": Number of split windows "
            "has to match number of workloadInfo.m_OutputTensorInfos. "
            "Number of windows: " +
            to_string(m_ViewOrigins.size()) +
            ". Number of workloadInfo.m_OutputTensorInfos: " + to_string(workloadInfo.m_OutputTensorInfos.size()));
    }

    //The dimensionality of all the windows has to match the dimensionality (not shape) of the input.
    std::size_t inputDims = workloadInfo.m_InputTensorInfos[0].GetNumDimensions();
    for(unsigned int w = 0; w < m_ViewOrigins.size(); ++w )
    {
        //Checks that the dimensionality of input is same as the split windows.
        ViewOrigin const& e = m_ViewOrigins[w];
        if (e.m_Origin.size() != inputDims)
        {
            throw InvalidArgumentException(descriptorName + ": Window origin have to "
                                           "have the same dimensionality as the input tensor. "
                                           "Window origin (index: " +
                                           to_string(w) + ") has " + to_string(e.m_Origin.size()) +
                                           " dimensions, the input "
                                           "tensor has " +
                                           to_string(inputDims) + " dimensions.");
        }
        for (unsigned int i = 0; i < e.m_Origin.size(); ++i)
        {
            if (e.m_Origin[i] + workloadInfo.m_OutputTensorInfos[w].GetShape()[i] >
                workloadInfo.m_InputTensorInfos[0].GetShape()[i])
            {
                throw InvalidArgumentException(descriptorName + ": Window extent coordinates have to "
                                               "be smaller or equal than the size of the input in that coord.");
            }
        }
    }
}

void ConcatQueueDescriptor::Validate(const WorkloadInfo& workloadInfo) const
{
    const std::string descriptorName{"ConcatQueueDescriptor"};

    ValidateNumOutputs(workloadInfo, descriptorName, 1);

    if (m_Inputs.size() <= 0)
    {
        throw InvalidArgumentException(descriptorName + ": At least one input needs to be provided.");
    }
    if (m_Outputs.size() <= 0)
    {
        throw InvalidArgumentException(descriptorName + ": At least one output needs to be provided.");
    }

    if (workloadInfo.m_InputTensorInfos.size() <= 0)
    {
        throw InvalidArgumentException(descriptorName + ": At least one TensorInfo input needs to be provided.");
    }
    if (workloadInfo.m_OutputTensorInfos.size() <= 0)
    {
        throw InvalidArgumentException(descriptorName + ": At least one TensorInfo output needs to be provided.");
    }

    if(m_Parameters.GetConcatAxis() > workloadInfo.m_InputTensorInfos[0].GetShape().GetNumDimensions())
    {
        throw InvalidArgumentException(descriptorName + ": Invalid concatenation axis provided.");
    }

    if (workloadInfo.m_InputTensorInfos[0].GetShape().GetNumDimensions() - m_Parameters.GetConcatAxis() == 1)
    {
        return;
    }

    if (workloadInfo.m_InputTensorInfos.size() != m_ViewOrigins.size())
    {
        throw InvalidArgumentException(
            descriptorName + ": Number of split windows "
            "has to match number of workloadInfo.m_InputTensorInfos. "
            "Number of windows: " +
            to_string(m_ViewOrigins.size()) +
            ". Number of workloadInfo.m_InputTensorInfos: " + to_string(workloadInfo.m_InputTensorInfos.size()));
    }

    //The dimensionality of all the windows has to match the dimensionality (not shape) of the output.
    std::size_t outputDims = workloadInfo.m_OutputTensorInfos[0].GetNumDimensions();
    for(unsigned int w = 0; w < m_ViewOrigins.size(); ++w )
    {
        //Checks that the dimensionality of output is same as the split windows.
        ViewOrigin const& e = m_ViewOrigins[w];
        if (e.m_Origin.size() != outputDims)
        {
            throw InvalidArgumentException(descriptorName + ": Window origin have to "
                                           "have the same dimensionality as the output tensor. "
                                           "Window origin (index: " +
                                           to_string(w) + ") has " + to_string(e.m_Origin.size()) +
                                           " dimensions, the output "
                                           "tensor has " +
                                           to_string(outputDims) + " dimensions.");
        }
        //Checks that the merge windows are within the output tensor.
        for (unsigned int i = 0; i < e.m_Origin.size(); ++i)
        {
            if (e.m_Origin[i] + workloadInfo.m_InputTensorInfos[w].GetShape()[i]
                > workloadInfo.m_OutputTensorInfos[0].GetShape()[i])
            {
                throw InvalidArgumentException(descriptorName + ": Window extent coordinates have to "
                                               "be smaller or equal than the size of the output in that coord.");
            }
        }
    }

    // Check the supported data types
    std::vector<DataType> supportedTypes =
    {
            DataType::Float32,
            DataType::Float16,
            DataType::Boolean,
            DataType::Signed32,
            DataType::QuantisedAsymm8,
            DataType::QuantisedSymm16
    };

    const TensorInfo& outputTensorInfo = workloadInfo.m_OutputTensorInfos[0];
    for (unsigned long i = 0ul; i < workloadInfo.m_InputTensorInfos.size(); ++i)
    {
        const TensorInfo& inputTensorInfo = workloadInfo.m_InputTensorInfos[i];
        ValidateDataTypes(inputTensorInfo, supportedTypes, descriptorName);

        const std::string inputName = "input_" + std::to_string(i);
        ValidateTensorDataTypesMatch(inputTensorInfo, outputTensorInfo, descriptorName, inputName, "output");
    }
}

void StackQueueDescriptor::Validate(const WorkloadInfo& workloadInfo) const
{
    const std::string descriptorName{"StackQueueDescriptor"};

    ValidateNumOutputs(workloadInfo, descriptorName, 1);

    if (m_Parameters.m_NumInputs != workloadInfo.m_InputTensorInfos.size())
    {
        throw InvalidArgumentException(descriptorName + ": Must have the defined number of input tensors.");
    }

    // All inputs must have the same shape, which is defined in parameters
    const TensorShape& inputShape = m_Parameters.m_InputShape;
    for (unsigned int i = 0; i < workloadInfo.m_InputTensorInfos.size(); ++i)
    {
        if (workloadInfo.m_InputTensorInfos[i].GetShape() != inputShape)
        {
            throw InvalidArgumentException(descriptorName + ": All input tensor shapes must match the defined shape.");
        }
    }

    // m_Axis is 0-based and may take values from 0 to the number of input dimensions (inclusive),
    // since the output tensor has an additional dimension.
    if (m_Parameters.m_Axis > inputShape.GetNumDimensions())
    {
        throw InvalidArgumentException(descriptorName + ": Axis may not be greater "
                                       "than the number of input dimensions.");
    }

    // Output shape must be as inferred from the input shape
    const TensorShape& outputShape = workloadInfo.m_OutputTensorInfos[0].GetShape();
    for (unsigned int i = 0; i < m_Parameters.m_Axis; ++i)
    {
        if (outputShape[i] != inputShape[i])
        {
            throw InvalidArgumentException(descriptorName + ": Output tensor must "
                                           "match shape inferred from input tensor.");
        }
    }

    if (outputShape[m_Parameters.m_Axis] != m_Parameters.m_NumInputs)
    {
        throw InvalidArgumentException(descriptorName + ": Output tensor must "
                                       "match shape inferred from input tensor.");
    }

    for (unsigned int i = m_Parameters.m_Axis + 1; i < inputShape.GetNumDimensions() + 1; ++i)
    {
        if (outputShape[i] != inputShape[i-1])
        {
            throw InvalidArgumentException(descriptorName + ": Output tensor must "
                                           "match shape inferred from input tensor.");
        }
    }

    // Check the supported data types
    std::vector<DataType> supportedTypes =
    {
            DataType::Float32,
            DataType::Float16,
            DataType::Boolean,
            DataType::Signed32,
            DataType::QuantisedAsymm8,
            DataType::QuantisedSymm16
    };

    ValidateDataTypes(workloadInfo.m_InputTensorInfos[0], supportedTypes, descriptorName);

    for (unsigned int i = 1ul; i < workloadInfo.m_InputTensorInfos.size(); ++i)
    {
        ValidateTensorDataTypesMatch(workloadInfo.m_InputTensorInfos[0],
                                     workloadInfo.m_InputTensorInfos[i],
                                     descriptorName,
                                     "input_0",
                                     "input_" + std::to_string(i));
    }

    ValidateTensorDataTypesMatch(workloadInfo.m_InputTensorInfos[0],
                                 workloadInfo.m_OutputTensorInfos[0],
                                 descriptorName,
                                 "input_0",
                                 "output");
}

void FullyConnectedQueueDescriptor::Validate(const WorkloadInfo& workloadInfo) const
{
    const std::string descriptorName{"FullyConnectedQueueDescriptor"};

    ValidateNumInputs(workloadInfo,  descriptorName, 1);
    ValidateNumOutputs(workloadInfo, descriptorName, 1);

    const TensorInfo& inputTensorInfo  = workloadInfo.m_InputTensorInfos[0];
    const TensorInfo& outputTensorInfo = workloadInfo.m_OutputTensorInfos[0];

    ValidateTensorNumDimensions(outputTensorInfo, descriptorName, 2, "output");

    if (!(inputTensorInfo.GetNumDimensions() == 2 || inputTensorInfo.GetNumDimensions() == 4))
    {
        throw InvalidArgumentException(descriptorName + ": Input tensor must have 2 or 4 dimensions.");
    }

    ValidatePointer(m_Weight, descriptorName, "weight");

    const TensorInfo& weightTensorInfo = m_Weight->GetTensorInfo();
    ValidateTensorNumDimensions(weightTensorInfo, descriptorName, 2, "weight");

    if (m_Parameters.m_BiasEnabled)
    {
        ValidatePointer(m_Bias, descriptorName, "bias");

        // Validates type and quantization values.
        const TensorInfo& biasTensorInfo = m_Bias->GetTensorInfo();
        ValidateBiasTensorQuantization(biasTensorInfo, inputTensorInfo, weightTensorInfo, descriptorName);

        ValidateTensorDataType(biasTensorInfo, GetBiasDataType(inputTensorInfo.GetDataType()), descriptorName, "bias");
        ValidateTensorNumDimensions(biasTensorInfo, descriptorName, 1, "bias");
    }

    // Check the supported data types
    std::vector<DataType> supportedTypes =
    {
            DataType::Float32,
            DataType::Float16,
            DataType::QuantisedAsymm8,
            DataType::QuantisedSymm16
    };

    ValidateDataTypes(inputTensorInfo, supportedTypes, descriptorName);
    ValidateTensorDataTypesMatch(inputTensorInfo, outputTensorInfo, descriptorName, "input", "output");
}

void NormalizationQueueDescriptor::Validate(const WorkloadInfo& workloadInfo) const
{
    const std::string descriptorName{"NormalizationQueueDescriptor"};

    ValidateNumInputs(workloadInfo,  descriptorName, 1);
    ValidateNumOutputs(workloadInfo, descriptorName, 1);

    const TensorInfo& inputTensorInfo  = workloadInfo.m_InputTensorInfos[0];
    const TensorInfo& outputTensorInfo = workloadInfo.m_OutputTensorInfos[0];

    // Check the supported data types
    std::vector<DataType> supportedTypes =
    {
        DataType::Float16,
        DataType::Float32,
        DataType::QuantisedAsymm8,
        DataType::QuantisedSymm16
    };

    ValidateDataTypes(inputTensorInfo, supportedTypes, descriptorName);

    ValidateTensorDataTypesMatch(inputTensorInfo, outputTensorInfo, descriptorName, "input", "output");

    ValidateTensorShapesMatch(inputTensorInfo, outputTensorInfo, descriptorName, "input", "output");
}

void AdditionQueueDescriptor::Validate(const WorkloadInfo& workloadInfo) const
{
    const std::string descriptorName{"AdditionQueueDescriptor"};

    ValidateNumInputs(workloadInfo,  descriptorName, 2);
    ValidateNumOutputs(workloadInfo, descriptorName, 1);

    const TensorInfo& inputTensorInfo0 = workloadInfo.m_InputTensorInfos[0];
    const TensorInfo& inputTensorInfo1 = workloadInfo.m_InputTensorInfos[1];
    const TensorInfo& outputTensorInfo = workloadInfo.m_OutputTensorInfos[0];

    std::vector<DataType> supportedTypes =
    {
        DataType::Float32,
        DataType::QuantisedAsymm8,
        DataType::QuantisedSymm16,
        DataType::Float16
    };

    ValidateDataTypes(inputTensorInfo0, supportedTypes, descriptorName);
    ValidateDataTypes(inputTensorInfo1, supportedTypes, descriptorName);
    ValidateDataTypes(outputTensorInfo, supportedTypes, descriptorName);

    ValidateTensorDataTypesMatch(inputTensorInfo0, inputTensorInfo1, descriptorName, "input_0", "input_1");
    ValidateTensorDataTypesMatch(inputTensorInfo1, outputTensorInfo, descriptorName, "input_1", "output");

    ValidateBroadcastTensorShapesMatch(inputTensorInfo0,
                                       inputTensorInfo1,
                                       outputTensorInfo,
                                       descriptorName,
                                       "input_0",
                                       "input_1");
}

void MultiplicationQueueDescriptor::Validate(const WorkloadInfo& workloadInfo) const
{
    const std::string descriptorName{"MultiplicationQueueDescriptor"};

    ValidateNumInputs(workloadInfo,  descriptorName, 2);
    ValidateNumOutputs(workloadInfo, descriptorName, 1);

    const TensorInfo& inputTensorInfo0 = workloadInfo.m_InputTensorInfos[0];
    const TensorInfo& inputTensorInfo1 = workloadInfo.m_InputTensorInfos[1];
    const TensorInfo& outputTensorInfo = workloadInfo.m_OutputTensorInfos[0];

    std::vector<DataType> supportedTypes =
    {
        DataType::Float32,
        DataType::QuantisedAsymm8,
        DataType::QuantisedSymm16,
        DataType::Float16
    };

    ValidateDataTypes(inputTensorInfo0, supportedTypes, descriptorName);
    ValidateDataTypes(inputTensorInfo1, supportedTypes, descriptorName);
    ValidateDataTypes(outputTensorInfo, supportedTypes, descriptorName);

    ValidateTensorDataTypesMatch(inputTensorInfo0, inputTensorInfo1, descriptorName, "input_0", "input_1");
    ValidateTensorDataTypesMatch(inputTensorInfo1, outputTensorInfo, descriptorName, "input_1", "output");

    ValidateBroadcastTensorShapesMatch(inputTensorInfo0,
                                       inputTensorInfo1,
                                       outputTensorInfo,
                                       descriptorName,
                                       "input_0",
                                       "input_1");
}

void BatchNormalizationQueueDescriptor::Validate(const WorkloadInfo& workloadInfo) const
{
    const std::string descriptorName{"BatchNormalizationQueueDescriptor"};

    ValidateNumInputs(workloadInfo,  descriptorName, 1);
    ValidateNumOutputs(workloadInfo, descriptorName, 1);

    const TensorInfo& inputTensorInfo  = workloadInfo.m_InputTensorInfos[0];
    const TensorInfo& outputTensorInfo = workloadInfo.m_OutputTensorInfos[0];

    std::vector<DataType> supportedTypes =
    {
        DataType::Float16,
        DataType::Float32,
        DataType::QuantisedAsymm8,
        DataType::QuantisedSymm16
    };

    ValidateDataTypes(inputTensorInfo,  supportedTypes, descriptorName);
    ValidateDataTypes(outputTensorInfo, supportedTypes, descriptorName);

    ValidateTensorDataTypesMatch(inputTensorInfo, outputTensorInfo, descriptorName, "input", "output");
    ValidateTensorQuantizationSpace(inputTensorInfo, outputTensorInfo, descriptorName, "input", "output");
    ValidateTensorShapesMatch(inputTensorInfo, outputTensorInfo, descriptorName, "input", "output");

    ValidatePointer(m_Mean,     descriptorName, "mean");
    ValidatePointer(m_Variance, descriptorName, "variance");
    ValidatePointer(m_Beta,     descriptorName, "beta");
    ValidatePointer(m_Gamma,    descriptorName, "gamma");

    const TensorInfo& mean     = m_Mean->GetTensorInfo();
    const TensorInfo& variance = m_Variance->GetTensorInfo();
    const TensorInfo& beta     = m_Beta->GetTensorInfo();
    const TensorInfo& gamma    = m_Gamma->GetTensorInfo();

    ValidateTensorNumDimensions(mean,     descriptorName, 1, "mean");
    ValidateTensorNumDimensions(variance, descriptorName, 1, "variance");
    ValidateTensorNumDimensions(beta,     descriptorName, 1, "beta");
    ValidateTensorNumDimensions(gamma,    descriptorName, 1, "gamma");

    ValidateTensorShapesMatch(mean, variance, descriptorName, "mean", "variance");
    ValidateTensorShapesMatch(mean, beta,     descriptorName, "mean", "beta");
    ValidateTensorShapesMatch(mean, gamma,    descriptorName, "mean", "gamma");
}

void Convolution2dQueueDescriptor::Validate(const WorkloadInfo& workloadInfo) const
{
    const std::string descriptorName{"Convolution2dQueueDescriptor"};

    ValidateNumInputs(workloadInfo,  descriptorName, 1);
    ValidateNumOutputs(workloadInfo, descriptorName, 1);

    const TensorInfo& inputTensorInfo  = workloadInfo.m_InputTensorInfos[0];
    const TensorInfo& outputTensorInfo = workloadInfo.m_OutputTensorInfos[0];

    ValidateTensorNumDimensions(inputTensorInfo,  descriptorName, 4, "input");
    ValidateTensorNumDimensions(outputTensorInfo, descriptorName, 4, "output");

    ValidatePointer(m_Weight, descriptorName, "weight");

    const TensorInfo& weightTensorInfo = m_Weight->GetTensorInfo();
    ValidateTensorNumDimensions(weightTensorInfo, descriptorName, 4, "weight");

    ValidateTensorDataTypesMatch(inputTensorInfo, weightTensorInfo, descriptorName, "input", "weight");

    if (m_Parameters.m_BiasEnabled)
    {
        ValidatePointer(m_Bias, descriptorName, "bias");

        const TensorInfo& biasTensorInfo = m_Bias->GetTensorInfo();
        ValidateTensorNumDimensions(biasTensorInfo, descriptorName, 1, "bias");

        ValidateTensorDataType(biasTensorInfo, GetBiasDataType(inputTensorInfo.GetDataType()), descriptorName, "bias");
        ValidateBiasTensorQuantization(biasTensorInfo, inputTensorInfo, weightTensorInfo, descriptorName);
    }

    std::vector<DataType> supportedTypes =
    {
        DataType::Float32,
        DataType::QuantisedAsymm8,
        DataType::QuantisedSymm16,
        DataType::Float16
    };

    ValidateDataTypes(inputTensorInfo, supportedTypes, descriptorName);
    ValidateTensorDataTypesMatch(inputTensorInfo, outputTensorInfo, descriptorName, "input", "output");
}

void DepthwiseConvolution2dQueueDescriptor::Validate(const WorkloadInfo& workloadInfo) const
{
    const std::string descriptorName{"DepthwiseConvolution2dQueueDescriptor"};

    ValidateNumInputs(workloadInfo,  descriptorName, 1);
    ValidateNumOutputs(workloadInfo, descriptorName, 1);

    const TensorInfo& inputTensorInfo  = workloadInfo.m_InputTensorInfos[0];
    const TensorInfo& outputTensorInfo = workloadInfo.m_OutputTensorInfos[0];

    ValidateTensorNumDimensions(inputTensorInfo,  descriptorName, 4, "input");
    ValidateTensorNumDimensions(outputTensorInfo, descriptorName, 4, "output");

    ValidatePointer(m_Weight, descriptorName, "weight");

    const TensorInfo& weightTensorInfo = m_Weight->GetTensorInfo();
    ValidateTensorNumDimensions(weightTensorInfo, descriptorName, 4, "weight");

    if (m_Parameters.m_DilationX < 1 || m_Parameters.m_DilationY < 1 )
    {
        throw InvalidArgumentException(
            boost::str(boost::format("%1%: dilationX (provided %2%) and dilationY (provided %3%) "
                                     "cannot be smaller than 1.") % descriptorName %
                                     m_Parameters.m_DilationX % m_Parameters.m_DilationX));
    }

    const unsigned int channelIndex = (m_Parameters.m_DataLayout == DataLayout::NCHW) ? 1 : 3;

    // Expected weight shape: [ M, I, H, W ] - This shape does NOT depend on the data layout
    // inputChannels * channelMultiplier should be equal to outputChannels.
    const unsigned int numWeightChannelMultiplier = weightTensorInfo.GetShape()[0];
    const unsigned int numWeightInputChannels     = weightTensorInfo.GetShape()[1];
    const unsigned int numWeightOutputChannels    = outputTensorInfo.GetShape()[channelIndex];
    if (numWeightChannelMultiplier * numWeightInputChannels != numWeightOutputChannels)
    {
        throw InvalidArgumentException(
            boost::str(boost::format("%1%: output_channels (provided %2%) should be "
                                     "equal to input_channels (provided %3%) multiplied by channel_multiplier "
                                     "(provided %4%).") % descriptorName % numWeightOutputChannels %
                                     numWeightInputChannels % numWeightChannelMultiplier));
    }

    ValidateTensorDataTypesMatch(inputTensorInfo, weightTensorInfo, descriptorName, "input", "weight");

    if (m_Parameters.m_BiasEnabled)
    {
        ValidatePointer(m_Bias, descriptorName, "bias");

        const TensorInfo& biasTensorInfo = m_Bias->GetTensorInfo();
        ValidateTensorNumDimensions(biasTensorInfo, descriptorName, 1, "bias");

        ValidateBiasTensorQuantization(biasTensorInfo, inputTensorInfo, weightTensorInfo, descriptorName);
        ValidateTensorDataType(biasTensorInfo, GetBiasDataType(inputTensorInfo.GetDataType()), descriptorName, "bias");
    }

    std::vector<DataType> supportedTypes =
    {
        DataType::Float32,
        DataType::QuantisedAsymm8,
        DataType::QuantisedSymm16,
        DataType::Float16
    };

    ValidateDataTypes(inputTensorInfo, supportedTypes, descriptorName);
    ValidateTensorDataTypesMatch(inputTensorInfo, outputTensorInfo, descriptorName, "input", "output");
}

void PermuteQueueDescriptor::Validate(const WorkloadInfo& workloadInfo) const
{
    const std::string descriptorName{"PermuteQueueDescriptor"};

    ValidateNumInputs(workloadInfo,  descriptorName, 1);
    ValidateNumOutputs(workloadInfo, descriptorName, 1);

    const PermutationVector& mapping = m_Parameters.m_DimMappings;

    const TensorInfo& inputTensorInfo  = workloadInfo.m_InputTensorInfos[0];
    const TensorInfo& outputTensorInfo = workloadInfo.m_OutputTensorInfos[0];

    ValidateTensorNumDimensions(inputTensorInfo,  descriptorName, mapping.GetSize(), "input");
    ValidateTensorNumDimensions(outputTensorInfo, descriptorName, mapping.GetSize(), "output");

    for (unsigned int i = 0u; i < mapping.GetSize(); ++i)
    {
        if (inputTensorInfo.GetShape()[i] != outputTensorInfo.GetShape()[mapping[i]])
        {
            throw InvalidArgumentException(descriptorName + ": src dimension " + to_string(i) +
                                           " (=" + to_string(inputTensorInfo.GetShape()[i]) + ") " +
                                           "must match dst dimension " + to_string(mapping[i]) +
                                           " (=" + to_string(outputTensorInfo.GetShape()[mapping[i]]) + ")");
        }
    }

    ValidateTensorDataTypesMatch(inputTensorInfo, outputTensorInfo, descriptorName, "input", "output");
}

void Pooling2dQueueDescriptor::Validate(const WorkloadInfo& workloadInfo) const
{
    const std::string descriptorName{"Pooling2dQueueDescriptor"};

    ValidateNumInputs(workloadInfo,  descriptorName, 1);
    ValidateNumOutputs(workloadInfo, descriptorName, 1);

    const TensorInfo& inputTensorInfo  = workloadInfo.m_InputTensorInfos[0];
    const TensorInfo& outputTensorInfo = workloadInfo.m_OutputTensorInfos[0];

    ValidateTensorNumDimensions(inputTensorInfo,  descriptorName, 4, "input");
    ValidateTensorNumDimensions(outputTensorInfo, descriptorName, 4, "output");

    std::vector<DataType> supportedTypes =
    {
        DataType::Float32,
        DataType::Float16,
        DataType::QuantisedAsymm8,
        DataType::QuantisedSymm16
    };

    ValidateDataTypes(inputTensorInfo, supportedTypes, descriptorName);
    ValidateTensorDataTypesMatch(inputTensorInfo, outputTensorInfo, descriptorName, "input", "output");
}

void ResizeBilinearQueueDescriptor::Validate(const WorkloadInfo& workloadInfo) const
{
    const std::string descriptorName{"ResizeBilinearQueueDescriptor"};

    ValidateNumInputs(workloadInfo,  descriptorName, 1);
    ValidateNumOutputs(workloadInfo, descriptorName, 1);

    const TensorInfo& inputTensorInfo  = workloadInfo.m_InputTensorInfos[0];
    const TensorInfo& outputTensorInfo = workloadInfo.m_OutputTensorInfos[0];

    ValidateTensorNumDimensions(inputTensorInfo,  descriptorName, 4, "input");
    ValidateTensorNumDimensions(outputTensorInfo, descriptorName, 4, "output");

    std::vector<DataType> supportedTypes =
    {
        DataType::Float16,
        DataType::Float32,
        DataType::QuantisedAsymm8,
        DataType::QuantisedSymm16
    };

    ValidateDataTypes(inputTensorInfo, supportedTypes, descriptorName);
    ValidateTensorDataTypesMatch(inputTensorInfo, outputTensorInfo, descriptorName, "input", "output");

    // ResizeBilinear only changes width and height: batch and channel count must match.
    const unsigned int inputBatchSize  = inputTensorInfo.GetShape()[0];
    const unsigned int outputBatchSize = outputTensorInfo.GetShape()[0];
    if (inputBatchSize != outputBatchSize)
    {
        throw InvalidArgumentException(
            boost::str(boost::format("%1%: Input batch size (%2%) "
                "does not match output batch size (%3%)") %
                descriptorName % inputBatchSize % outputBatchSize));
    }

    DataLayoutIndexed dimensionIndices(m_Parameters.m_DataLayout);
    const unsigned int inputChannelCount  = inputTensorInfo.GetShape()[dimensionIndices.GetChannelsIndex()];
    const unsigned int outputChannelCount = outputTensorInfo.GetShape()[dimensionIndices.GetChannelsIndex()];
    if (inputChannelCount != outputChannelCount)
    {
        throw InvalidArgumentException(
            boost::str(boost::format("%1%: Input channel count (%2%) "
                "does not match output channel count (%3%)") %
                descriptorName % inputChannelCount % outputChannelCount));
    }
}

void ResizeQueueDescriptor::Validate(const WorkloadInfo& workloadInfo) const
{
    const std::string descriptorName{"ResizeQueueDescriptor"};

    ValidateNumInputs(workloadInfo,  descriptorName, 1);
    ValidateNumOutputs(workloadInfo, descriptorName, 1);

    const TensorInfo& inputTensorInfo  = workloadInfo.m_InputTensorInfos[0];
    const TensorInfo& outputTensorInfo = workloadInfo.m_OutputTensorInfos[0];

    ValidateTensorNumDimensions(inputTensorInfo,  descriptorName, 4, "input");
    ValidateTensorNumDimensions(outputTensorInfo, descriptorName, 4, "output");

    std::vector<DataType> supportedTypes =
    {
        DataType::Float16,
        DataType::Float32,
        DataType::QuantisedAsymm8,
        DataType::QuantisedSymm16
    };

    ValidateDataTypes(inputTensorInfo, supportedTypes, descriptorName);
    ValidateTensorDataTypesMatch(inputTensorInfo, outputTensorInfo, descriptorName, "input", "output");

    // Resize only changes width and height: batch and channel count must match.
    const unsigned int inputBatchSize  = inputTensorInfo.GetShape()[0];
    const unsigned int outputBatchSize = outputTensorInfo.GetShape()[0];
    if (inputBatchSize != outputBatchSize)
    {
        throw InvalidArgumentException(
                boost::str(boost::format("%1%: Input batch size (%2%) "
                           "does not match output batch size (%3%)") %
                           descriptorName % inputBatchSize % outputBatchSize));
    }

    DataLayoutIndexed dimensionIndices(m_Parameters.m_DataLayout);
    const unsigned int inputChannelCount  = inputTensorInfo.GetShape()[dimensionIndices.GetChannelsIndex()];
    const unsigned int outputChannelCount = outputTensorInfo.GetShape()[dimensionIndices.GetChannelsIndex()];
    if (inputChannelCount != outputChannelCount)
    {
        throw InvalidArgumentException(
                boost::str(boost::format("%1%: Input channel count (%2%) "
                           "does not match output channel count (%3%)") %
                           descriptorName % inputChannelCount % outputChannelCount));
    }
}

void FakeQuantizationQueueDescriptor::Validate(const WorkloadInfo& workloadInfo) const
{
    const std::string descriptorName{"FakeQuantizationQueueDescriptor"};

    ValidateNumInputs(workloadInfo,  descriptorName, 1);
    ValidateNumOutputs(workloadInfo, descriptorName, 1);

    const TensorInfo& inputTensorInfo  = workloadInfo.m_InputTensorInfos[0];
    const TensorInfo& outputTensorInfo = workloadInfo.m_OutputTensorInfos[0];

    ValidateTensorNumDimensions(inputTensorInfo,  descriptorName, 2, "input");
    ValidateTensorNumDimensions(outputTensorInfo, descriptorName, 2, "output");

    ValidateTensorShapesMatch(inputTensorInfo, outputTensorInfo,  descriptorName, "input", "output");

    if (m_Parameters.m_Min > m_Parameters.m_Max)
    {
        throw InvalidArgumentException(descriptorName + ": min cannot be greater than max");
    }
}

void L2NormalizationQueueDescriptor::Validate(const WorkloadInfo& workloadInfo) const
{
    const std::string descriptorName{"L2NormalizationQueueDescriptor"};

    ValidateNumInputs(workloadInfo,  descriptorName, 1);
    ValidateNumOutputs(workloadInfo, descriptorName, 1);

    const TensorInfo& inputTensorInfo  = workloadInfo.m_InputTensorInfos[0];
    const TensorInfo& outputTensorInfo = workloadInfo.m_OutputTensorInfos[0];

    if (inputTensorInfo.GetNumDimensions() > 4)
    {
        throw InvalidArgumentException(descriptorName + ": Input tensors with rank greater than 4 are not supported.");
    }

    ValidateTensorShapesMatch(inputTensorInfo, outputTensorInfo, descriptorName, "input", "output");

    // Check the supported data types
    std::vector<DataType> supportedTypes =
    {
        DataType::Float32,
        DataType::Float16,
        DataType::QuantisedAsymm8,
        DataType::QuantisedSymm16
    };

    ValidateDataTypes(inputTensorInfo,  supportedTypes, descriptorName);
    ValidateDataTypes(outputTensorInfo, supportedTypes, descriptorName);

    ValidateTensorDataTypesMatch(inputTensorInfo, outputTensorInfo, descriptorName, "input", "output");
}

void ConstantQueueDescriptor::Validate(const WorkloadInfo& workloadInfo) const
{
    const std::string descriptorName{"ConstantQueueDescriptor"};

    ValidateNumInputs(workloadInfo,  descriptorName, 0);
    ValidateNumOutputs(workloadInfo, descriptorName, 1);

    if (!m_LayerOutput)
    {
        throw InvalidArgumentException(descriptorName + ": No const input specified.");
    }

    const TensorInfo& outputTensorInfo = workloadInfo.m_OutputTensorInfos[0];
    ValidateTensorShapesMatch(m_LayerOutput->GetTensorInfo(), outputTensorInfo, descriptorName, "constant", "output");

    // Check the supported data types
    std::vector<DataType> supportedTypes =
    {
        DataType::Float32,
        DataType::Float16,
        DataType::Signed32,
        DataType::QuantisedAsymm8,
        DataType::QuantisedSymm16
    };

    ValidateDataTypes(outputTensorInfo, supportedTypes, descriptorName);
}

void ReshapeQueueDescriptor::Validate(const WorkloadInfo& workloadInfo) const
{
    const std::string descriptorName{"ReshapeQueueDescriptor"};

    ValidateNumInputs(workloadInfo,  descriptorName, 1);
    ValidateNumOutputs(workloadInfo, descriptorName, 1);

    const TensorInfo& inputTensorInfo  = workloadInfo.m_InputTensorInfos[0];
    const TensorInfo& outputTensorInfo = workloadInfo.m_OutputTensorInfos[0];

    ValidateTensorNumElementsMatch(inputTensorInfo, outputTensorInfo, descriptorName, "input", "output");

    // Check the supported data types
    std::vector<DataType> supportedTypes =
    {
        DataType::Float32,
        DataType::Float16,
        DataType::QuantisedAsymm8,
        DataType::QuantisedSymm16
    };

    ValidateDataTypes(inputTensorInfo, supportedTypes, descriptorName);
    ValidateTensorDataTypesMatch(inputTensorInfo, outputTensorInfo, descriptorName, "input", "output");
}

void SpaceToBatchNdQueueDescriptor::Validate(const WorkloadInfo& workloadInfo) const
{
    const std::string descriptorName{"SpaceToBatchNdQueueDescriptor"};

    ValidateNumInputs(workloadInfo,  descriptorName, 1);
    ValidateNumOutputs(workloadInfo, descriptorName, 1);

    const TensorInfo& inputTensorInfo  = workloadInfo.m_InputTensorInfos[0];
    const TensorInfo& outputTensorInfo = workloadInfo.m_OutputTensorInfos[0];

    ValidateTensorNumDimensions(inputTensorInfo,  descriptorName, 4, "input");
    ValidateTensorNumDimensions(outputTensorInfo, descriptorName, 4, "output");

    if (m_Parameters.m_BlockShape.size() != 2)
    {
        throw InvalidArgumentException(descriptorName + ": Block Shape must contain 2 spatial dimensions.");
    }

    if (m_Parameters.m_BlockShape.size() != m_Parameters.m_PadList.size())
    {
        throw InvalidArgumentException(descriptorName + ": Pad List must contain the same number of "
                                       "dimensions as Block Shape.");
    }

    const TensorShape& inputShape = inputTensorInfo.GetShape();

    std::pair<unsigned int, unsigned int> heightPad = m_Parameters.m_PadList[0];
    std::pair<unsigned int, unsigned int> widthPad  = m_Parameters.m_PadList[1];

    DataLayoutIndexed dimensionIndices(m_Parameters.m_DataLayout);

    const unsigned int inputWidth  = inputShape[dimensionIndices.GetWidthIndex()] +
                                     widthPad.first + widthPad.second;
    const unsigned int inputHeight = inputShape[dimensionIndices.GetHeightIndex()] +
                                     heightPad.first + heightPad.second;

    const unsigned int numInputElements  = inputShape[0] * inputHeight * inputWidth *
                                           inputShape[dimensionIndices.GetChannelsIndex()];
    const unsigned int numOutputElements = outputTensorInfo.GetNumElements();

    if (numOutputElements != numInputElements)
    {
        throw InvalidArgumentException(descriptorName + ": Input tensor has " +
            to_string(numInputElements) + " after padding but output tensor has " +
            to_string(numOutputElements) + " elements.");
    }

    if (inputHeight % m_Parameters.m_BlockShape[0] != 0 || inputWidth % m_Parameters.m_BlockShape[1] != 0)
    {
        throw InvalidArgumentException(descriptorName + ": Input shape after padding must be "
                                       "divisible by Block Shape in all spatial dimensions");
    }

    std::vector<DataType> supportedTypes =
    {
            DataType::Float16,
            DataType::Float32,
            DataType::QuantisedAsymm8,
            DataType::QuantisedSymm16
    };

    ValidateDataTypes(inputTensorInfo, supportedTypes, descriptorName);
    ValidateTensorDataTypesMatch(inputTensorInfo, outputTensorInfo, descriptorName, "input", "output");
}

void SpaceToDepthQueueDescriptor::Validate(const WorkloadInfo& workloadInfo) const
{
    const std::string descriptorName{"SpaceToDepthQueueDescriptor"};

    ValidateNumInputs(workloadInfo,  descriptorName, 1);
    ValidateNumOutputs(workloadInfo, descriptorName, 1);

    const TensorInfo& inputTensorInfo  = workloadInfo.m_InputTensorInfos[0];
    const TensorInfo& outputTensorInfo = workloadInfo.m_OutputTensorInfos[0];

    ValidateTensorNumDimensions(inputTensorInfo,  descriptorName, 4, "input");
    ValidateTensorNumDimensions(outputTensorInfo, descriptorName, 4, "output");

    std::vector<DataType> supportedTypes =
    {
        DataType::Float32,
        DataType::Float16,
        DataType::QuantisedAsymm8,
        DataType::QuantisedSymm16
    };

    ValidateDataTypes(inputTensorInfo,  supportedTypes, descriptorName);
    ValidateDataTypes(outputTensorInfo, supportedTypes, descriptorName);

    DataLayoutIndexed dimensionIndices(m_Parameters.m_DataLayout);
    const unsigned int wIndex = dimensionIndices.GetWidthIndex();
    const unsigned int hIndex = dimensionIndices.GetHeightIndex();
    const unsigned int cIndex = dimensionIndices.GetChannelsIndex();

    const TensorShape& inputShape = inputTensorInfo.GetShape();

    const unsigned int numInputElements  =
        inputShape[0] * inputShape[wIndex] * inputShape[hIndex] * inputShape[cIndex];
    const unsigned int numOutputElements = outputTensorInfo.GetNumElements();

    if (numOutputElements != numInputElements)
    {
        throw InvalidArgumentException(descriptorName + ": Input tensor has " +
            std::to_string(numInputElements) + " but output tensor has " +
            std::to_string(numOutputElements) + " elements.");
    }

    if (inputShape[hIndex] % m_Parameters.m_BlockSize != 0 || inputShape[wIndex]  % m_Parameters.m_BlockSize != 0)
    {
        throw InvalidArgumentException(descriptorName + ": Input shape must be divisible "
                                       "by block size in all spatial dimensions");
    }
}

void FloorQueueDescriptor::Validate(const WorkloadInfo& workloadInfo) const
{
    const std::string descriptorName{"FloorQueueDescriptor"};

    ValidateNumInputs(workloadInfo,  descriptorName, 1);
    ValidateNumOutputs(workloadInfo, descriptorName, 1);

    const TensorInfo& inputTensorInfo  = workloadInfo.m_InputTensorInfos[0];
    const TensorInfo& outputTensorInfo = workloadInfo.m_OutputTensorInfos[0];

    std::vector<DataType> supportedTypes =
    {
        DataType::Float32,
        DataType::QuantisedSymm16
    };

    ValidateDataTypes(inputTensorInfo,  supportedTypes, descriptorName);

    if (inputTensorInfo != outputTensorInfo)
    {
        throw InvalidArgumentException(descriptorName + ": Input and output tensor infos do not match.");
    }
}

void LstmQueueDescriptor::Validate(const WorkloadInfo& workloadInfo) const
{
    // ported from android/ml/nn/common/operations/LSTM.cpp CheckInputTensorDimensions()

    const std::string descriptorName{"LstmQueueDescriptor"};

    // check dimensions of all inputs and outputs
    if (workloadInfo.m_InputTensorInfos.size() != 3)
    {
        throw InvalidArgumentException(descriptorName + ": Invalid number of inputs.");
    }
    if (workloadInfo.m_OutputTensorInfos.size() != 4)
    {
        throw InvalidArgumentException(descriptorName + ": Invalid number of outputs.");
    }

    std::vector<DataType> supportedTypes =
    {
        DataType::Float16,
        DataType::Float32,
        DataType::QuantisedSymm16
    };

    // check for supported type of one input and match them with all the other input and output
    ValidateDataTypes(workloadInfo.m_InputTensorInfos[0], supportedTypes, descriptorName);

    // type matches all other inputs
    for (uint32_t i = 1u; i < workloadInfo.m_InputTensorInfos.size(); ++i)
    {
        ValidateTensorDataTypesMatch(workloadInfo.m_InputTensorInfos[0],
                                     workloadInfo.m_InputTensorInfos[i],
                                     descriptorName,
                                     "input_0",
                                     "input_" + std::to_string(i));
    }
    // type matches all other outputs
    for (uint32_t i = 0u; i < workloadInfo.m_OutputTensorInfos.size(); ++i)
    {
        ValidateTensorDataTypesMatch(workloadInfo.m_InputTensorInfos[0],
                                     workloadInfo.m_OutputTensorInfos[i],
                                     "LstmQueueDescriptor",
                                     "input_0",
                                     "output_" + std::to_string(i));
    }

    // TODO: check clipping parameter is valid

    // Inferring batch size, number of outputs and number of cells from the inputs.
    // TODO: figure out if there is a way to make sure the specific inputs are at that index of workloadInfo
    const uint32_t n_input = workloadInfo.m_InputTensorInfos[0].GetShape()[1];
    const uint32_t n_batch = workloadInfo.m_InputTensorInfos[0].GetShape()[0];
    ValidatePointer(m_InputToOutputWeights, "Null pointer check", "InputToOutputWeights");
    const uint32_t n_cell = m_InputToOutputWeights->GetShape()[0];
    ValidatePointer(m_RecurrentToOutputWeights, "Null pointer check", "RecurrentToOutputWeights");
    const uint32_t n_output = m_RecurrentToOutputWeights->GetShape()[1];

    // input tensor
    ValidateTensorNumDimNumElem(workloadInfo.m_InputTensorInfos[0], 2, (n_batch * n_input),
                                descriptorName + " input_0");
    // outputStateInTensor
    ValidateTensorNumDimNumElem(workloadInfo.m_InputTensorInfos[1], 2, (n_batch * n_output),
                                descriptorName + " input_1");
    // outputStateInTensor
    ValidateTensorNumDimNumElem(workloadInfo.m_InputTensorInfos[2], 2, (n_batch * n_cell),
                                descriptorName + " input_2");
    // scratchBufferTensor
    unsigned int scratchBufferSize = m_Parameters.m_CifgEnabled ? n_cell * 3 : n_cell * 4;
    ValidateTensorNumDimNumElem(workloadInfo.m_OutputTensorInfos[0], 2, (n_batch * scratchBufferSize),
                                descriptorName + " output_0");
    // outputStateOutTensor
    ValidateTensorNumDimNumElem(workloadInfo.m_OutputTensorInfos[1], 2, (n_batch * n_output),
                                descriptorName + " output_1");
    // cellStateOutTensor
    ValidateTensorNumDimNumElem(workloadInfo.m_OutputTensorInfos[2], 2, (n_batch * n_cell),
                                descriptorName + " output_2");
    // outputTensor
    ValidateTensorNumDimNumElem(workloadInfo.m_OutputTensorInfos[3], 2, (n_batch * n_output),
                                descriptorName + " output_3");


    // check that dimensions of inputs/outputs and QueueDescriptor data match with each other
    if ( m_InputToInputWeights )
    {
        ValidateTensorNumDimNumElem(m_InputToInputWeights->GetTensorInfo(), 2,
                                      (n_cell * n_input), "InputLayerNormWeights");
    }

    ValidatePointer(m_InputToForgetWeights, "Null pointer check", "InputToForgetWeights");
    ValidateTensorNumDimNumElem(m_InputToForgetWeights->GetTensorInfo(), 2,
                                  (n_cell * n_input), "InputToForgetWeights");

    ValidatePointer(m_InputToCellWeights, "Null pointer check", "InputToCellWeights");
    ValidateTensorNumDimNumElem(m_InputToCellWeights->GetTensorInfo(), 2,
                                  (n_cell * n_input), "InputToCellWeights");

    if ( m_RecurrentToInputWeights )
    {
        ValidateTensorNumDimNumElem(m_RecurrentToInputWeights->GetTensorInfo(), 2,
                                      (n_cell * n_output), "RecurrentToInputWeights");
    }

    ValidatePointer(m_RecurrentToForgetWeights, "Null pointer check", "RecurrentToForgetWeights");
    ValidateTensorNumDimNumElem(m_RecurrentToForgetWeights->GetTensorInfo(), 2,
                                  (n_cell * n_output), "RecurrentToForgetWeights");

    ValidatePointer(m_RecurrentToCellWeights, "Null pointer check", "RecurrentToCellWeights");
    ValidateTensorNumDimNumElem(m_RecurrentToCellWeights->GetTensorInfo(), 2,
                                  (n_cell * n_output), "RecurrentToCellWeights");

    // Make sure the input-gate's parameters are either both present (regular
    // LSTM) or not at all (CIFG-LSTM). And CifgEnable is set accordingly.
    bool cifg_weights_all_or_none = ((m_InputToInputWeights && m_RecurrentToInputWeights &&
                                     !m_Parameters.m_CifgEnabled) ||
                                     (!m_InputToInputWeights && !m_RecurrentToInputWeights &&
                                     m_Parameters.m_CifgEnabled));
    if (!cifg_weights_all_or_none)
    {
        throw InvalidArgumentException(descriptorName + ": Input-Gate's parameters InputToInputWeights and "
                                       "RecurrentToInputWeights must either both be present (regular LSTM) "
                                       "or both not present (CIFG-LSTM). In addition CifgEnable must be set "
                                       "accordingly.");
    }

    if ( m_CellToInputWeights )
    {
        ValidateTensorNumDimNumElem(m_CellToInputWeights->GetTensorInfo(), 1,
                                      n_cell, "CellToInputWeights");
    }
    if ( m_CellToForgetWeights )
    {
        ValidateTensorNumDimNumElem(m_CellToForgetWeights->GetTensorInfo(), 1,
                                      n_cell, "CellToForgetWeights");
    }
    if ( m_CellToOutputWeights )
    {
        ValidateTensorNumDimNumElem(m_CellToOutputWeights->GetTensorInfo(), 1,
                                      n_cell, "CellToOutputWeights");
    }

    // Making sure the peephole weights are there all or none. And PeepholeEnable is set accordingly.
    bool peephole_weights_all_or_none =
            (((m_CellToInputWeights || m_Parameters.m_CifgEnabled) &&  m_CellToForgetWeights
            && m_CellToOutputWeights && m_Parameters.m_PeepholeEnabled)
            || ( !m_CellToInputWeights && !m_CellToForgetWeights
            && !m_CellToOutputWeights && !m_Parameters.m_PeepholeEnabled));
    if (!peephole_weights_all_or_none)
    {
        throw InvalidArgumentException(descriptorName + ": Invalid combination of peephole parameters.");
    }

    // Make sure the input gate bias is present only when not a CIFG-LSTM.
    if (m_Parameters.m_CifgEnabled)
    {
        if (m_InputGateBias)
        {
            throw InvalidArgumentException(descriptorName + ": InputGateBias is present and CIFG-LSTM is enabled.");
        }
    }
    else
    {
        if (!m_InputGateBias)
        {
            throw InvalidArgumentException(descriptorName + ": If CIFG-LSTM is disabled InputGateBias "
                                           "must be present.");
        }
        ValidateTensorNumDimNumElem(m_InputGateBias->GetTensorInfo(), 1,
                                      n_cell, "InputGateBias");
    }

    ValidatePointer(m_ForgetGateBias, "Null pointer check", "ForgetGateBias");
    ValidateTensorNumDimNumElem(m_ForgetGateBias->GetTensorInfo(), 1, n_cell, "ForgetGateBias");

    ValidatePointer(m_CellBias, "Null pointer check", "CellBias");
    ValidateTensorNumDimNumElem(m_CellBias->GetTensorInfo(), 1, n_cell, "CellBias");

    ValidatePointer(m_OutputGateBias, "Null pointer check", "OutputGateBias");
    ValidateTensorNumDimNumElem(m_OutputGateBias->GetTensorInfo(), 1, n_cell, "OutputGateBias");

    if (m_ProjectionWeights)
    {
        ValidateTensorNumDimNumElem(m_ProjectionWeights->GetTensorInfo(), 2,
                                      (n_cell * n_output), "ProjectionWeights");
    }
    if (m_ProjectionBias)
    {
        ValidateTensorNumDimNumElem(m_ProjectionBias->GetTensorInfo(), 1, n_output, "ProjectionBias");
    }

    // Making sure the projection tensors are consistent:
    // 1) If projection weight is not present, then projection bias should not be
    // present.
    // 2) If projection weight is present, then projection bias is optional.
    bool projecton_tensors_consistent = ((!m_ProjectionWeights && !m_ProjectionBias &&
                                        !m_Parameters.m_ProjectionEnabled)
                                        || (m_ProjectionWeights && !m_ProjectionBias &&
                                        m_Parameters.m_ProjectionEnabled)
                                        || (m_ProjectionWeights && m_ProjectionBias &&
                                        m_Parameters.m_ProjectionEnabled));
    if (!projecton_tensors_consistent)
    {
        throw InvalidArgumentException(descriptorName + ": Projection tensors are inconsistent.");
    }

    // The four layer normalization weights either all have values or none of them have values. Additionally, if
    // CIFG is used, input layer normalization weights tensor is omitted and the other layer normalization weights
    // either all have values or none of them have values. Layer normalization is used when the values of all the
    // layer normalization weights are present
    if (m_InputLayerNormWeights)
    {
        ValidateTensorNumDimNumElem(m_InputLayerNormWeights->GetTensorInfo(), 1, n_cell, "InputLayerNormWeights");
    }
    if (m_ForgetLayerNormWeights)
    {
        ValidateTensorNumDimNumElem(m_ForgetLayerNormWeights->GetTensorInfo(), 1, n_cell, "ForgetLayerNormWeights");
    }
    if (m_CellLayerNormWeights)
    {
        ValidateTensorNumDimNumElem(m_CellLayerNormWeights->GetTensorInfo(), 1, n_cell, "CellLayerNormWeights");
    }
    if (m_OutputLayerNormWeights)
    {
        ValidateTensorNumDimNumElem(m_OutputLayerNormWeights->GetTensorInfo(), 1, n_cell, "OutputLayerNormWeights");
    }

    if (m_Parameters.m_LayerNormEnabled)
    {
        if (!m_Parameters.m_CifgEnabled)
        {
            if (!m_InputLayerNormWeights)
            {
                throw InvalidArgumentException(descriptorName + ": Layer normalisation is enabled and CIFG-LSTM is "
                                               "disabled but InputLayerNormWeights are not present");
            }
            ValidateTensorNumDimNumElem(m_InputLayerNormWeights->GetTensorInfo(),
                                          1, n_cell, "InputLayerNormWeights");
        }
        else if (m_InputLayerNormWeights)
        {
            throw InvalidArgumentException(descriptorName + ":InputLayerNormWeights are present while CIFG is "
                                           "enabled");
        }

        ValidatePointer(m_ForgetLayerNormWeights, "Null pointer check layer normalisation enabled",
                        "ForgetLayerNormWeights");
        ValidateTensorNumDimNumElem(m_ForgetLayerNormWeights->GetTensorInfo(), 1, n_cell, "ForgetLayerNormWeights");

        ValidatePointer(m_OutputLayerNormWeights, "Null pointer check layer normalisation enabled",
                        "OutputLayerNormWeights");
        ValidateTensorNumDimNumElem(m_OutputLayerNormWeights->GetTensorInfo(), 1, n_cell, "OutputLayerNormWeights");

        ValidatePointer(m_CellLayerNormWeights, "Null pointer check layer normalisation enabled",
                        "CellLayerNormWeights");
        ValidateTensorNumDimNumElem(m_CellLayerNormWeights->GetTensorInfo(), 1, n_cell, "CellLayerNormWeights");
    }
    else if (m_InputLayerNormWeights || m_ForgetLayerNormWeights || m_OutputLayerNormWeights || m_CellLayerNormWeights)
    {
        throw InvalidArgumentException(descriptorName + ": Layer normalisation is disabled but one or more layer "
                                       "normalisation weights are present.");
    }
}

void ConvertFp32ToFp16QueueDescriptor::Validate(const WorkloadInfo& workloadInfo) const
{
    const std::string descriptorName{"ConvertFp32ToFp16QueueDescriptor"};

    ValidateNumInputs(workloadInfo,  descriptorName, 1);
    ValidateNumOutputs(workloadInfo, descriptorName, 1);

    const TensorInfo& inputTensorInfo  = workloadInfo.m_InputTensorInfos[0];
    const TensorInfo& outputTensorInfo = workloadInfo.m_OutputTensorInfos[0];

    if (inputTensorInfo.GetDataType() != DataType::Float32)
    {
        throw InvalidArgumentException(descriptorName + ": Input tensor type must be Float32.");
    }

    if (outputTensorInfo.GetDataType() != DataType::Float16)
    {
        throw InvalidArgumentException(descriptorName + ": Output tensor type must be Float16.");
    }

    ValidateTensorShapesMatch(inputTensorInfo, outputTensorInfo, descriptorName, "input", "output");
}

void ConvertFp16ToFp32QueueDescriptor::Validate(const WorkloadInfo& workloadInfo) const
{
    const std::string descriptorName{"ConvertFp16ToFp32QueueDescriptor"};

    ValidateNumInputs(workloadInfo,  descriptorName, 1);
    ValidateNumOutputs(workloadInfo, descriptorName, 1);

    const TensorInfo& inputTensorInfo  = workloadInfo.m_InputTensorInfos[0];
    const TensorInfo& outputTensorInfo = workloadInfo.m_OutputTensorInfos[0];

    if (inputTensorInfo.GetDataType() != DataType::Float16)
    {
        throw InvalidArgumentException(descriptorName + ": Input tensor type must be Float16.");
    }

    if (outputTensorInfo.GetDataType() != DataType::Float32)
    {
        throw InvalidArgumentException(descriptorName + ": Output tensor type must be Float32.");
    }

    ValidateTensorShapesMatch(inputTensorInfo, outputTensorInfo, descriptorName, "input", "output");
}

void DivisionQueueDescriptor::Validate(const WorkloadInfo& workloadInfo) const
{
    const std::string descriptorName{"DivisionQueueDescriptor"};

    ValidateNumInputs(workloadInfo,  descriptorName, 2);
    ValidateNumOutputs(workloadInfo, descriptorName, 1);

    const TensorInfo& inputTensorInfo0 = workloadInfo.m_InputTensorInfos[0];
    const TensorInfo& inputTensorInfo1 = workloadInfo.m_InputTensorInfos[1];
    const TensorInfo& outputTensorInfo = workloadInfo.m_OutputTensorInfos[0];

    std::vector<DataType> supportedTypes =
    {
        DataType::Float32,
        DataType::QuantisedAsymm8,
        DataType::QuantisedSymm16,
        DataType::Float16
    };

    ValidateDataTypes(inputTensorInfo0, supportedTypes, descriptorName);
    ValidateDataTypes(inputTensorInfo1, supportedTypes, descriptorName);
    ValidateDataTypes(outputTensorInfo, supportedTypes, descriptorName);

    ValidateBroadcastTensorShapesMatch(inputTensorInfo0,
                                       inputTensorInfo1,
                                       outputTensorInfo,
                                       descriptorName,
                                       "input_0",
                                       "input_1");
}

void SubtractionQueueDescriptor::Validate(const WorkloadInfo& workloadInfo) const
{
    const std::string descriptorName{"SubtractionQueueDescriptor"};

    ValidateNumInputs(workloadInfo,  descriptorName, 2);
    ValidateNumOutputs(workloadInfo, descriptorName, 1);

    const TensorInfo& inputTensorInfo0 = workloadInfo.m_InputTensorInfos[0];
    const TensorInfo& inputTensorInfo1 = workloadInfo.m_InputTensorInfos[1];
    const TensorInfo& outputTensorInfo = workloadInfo.m_OutputTensorInfos[0];

    std::vector<DataType> supportedTypes =
    {
        DataType::Float32,
        DataType::QuantisedAsymm8,
        DataType::QuantisedSymm16,
        DataType::Float16
    };

    ValidateDataTypes(inputTensorInfo0, supportedTypes, descriptorName);
    ValidateDataTypes(inputTensorInfo1, supportedTypes, descriptorName);
    ValidateDataTypes(outputTensorInfo, supportedTypes, descriptorName);

    ValidateBroadcastTensorShapesMatch(inputTensorInfo0,
                                       inputTensorInfo1,
                                       outputTensorInfo,
                                       descriptorName,
                                       "input_0",
                                       "input_1");
}

void MaximumQueueDescriptor::Validate(const WorkloadInfo& workloadInfo) const
{
    const std::string descriptorName{"MaximumQueueDescriptor"};

    ValidateNumInputs(workloadInfo,  descriptorName, 2);
    ValidateNumOutputs(workloadInfo, descriptorName, 1);

    const TensorInfo& inputTensorInfo0 = workloadInfo.m_InputTensorInfos[0];
    const TensorInfo& inputTensorInfo1 = workloadInfo.m_InputTensorInfos[1];
    const TensorInfo& outputTensorInfo = workloadInfo.m_OutputTensorInfos[0];

    std::vector<DataType> supportedTypes =
    {
        DataType::Float32,
        DataType::QuantisedAsymm8,
        DataType::QuantisedSymm16
    };

    ValidateDataTypes(inputTensorInfo0, supportedTypes, descriptorName);
    ValidateDataTypes(inputTensorInfo1, supportedTypes, descriptorName);
    ValidateDataTypes(outputTensorInfo, supportedTypes, descriptorName);

    ValidateBroadcastTensorShapesMatch(inputTensorInfo0,
                                       inputTensorInfo1,
                                       outputTensorInfo,
                                       descriptorName,
                                       "input_0",
                                       "input_1");
}

void MeanQueueDescriptor::Validate(const WorkloadInfo& workloadInfo) const
{
    const std::string descriptorName{"MeanQueueDescriptor"};

    ValidateNumInputs(workloadInfo,  descriptorName, 1);
    ValidateNumOutputs(workloadInfo, descriptorName, 1);

    const TensorInfo& inputTensorInfo  = workloadInfo.m_InputTensorInfos[0];
    const TensorInfo& outputTensorInfo = workloadInfo.m_OutputTensorInfos[0];

    std::vector<DataType> supportedTypes =
    {
        DataType::Float32,
        DataType::Float16,
        DataType::QuantisedAsymm8,
        DataType::QuantisedSymm16
    };

    // First check if input tensor data type is supported, then
    // check if this data type matches the output tensor data type
    ValidateDataTypes(inputTensorInfo,  supportedTypes, descriptorName);
    ValidateTensorDataTypesMatch(inputTensorInfo, outputTensorInfo, descriptorName, "input", "output");

    if (m_Parameters.m_KeepDims)
    {
        ValidateTensorNumDimensions(outputTensorInfo, descriptorName, inputTensorInfo.GetNumDimensions(), "output");
    }
    else if (m_Parameters.m_Axis.empty())
    {
        ValidateTensorNumDimensions(outputTensorInfo, descriptorName, 1, "output");
    }
    else
    {
        unsigned int outputDim =
            inputTensorInfo.GetNumDimensions() - boost::numeric_cast<unsigned int>(m_Parameters.m_Axis.size());
        ValidateTensorNumDimensions(outputTensorInfo,
                                    descriptorName,
                                    outputDim > 0 ? outputDim : 1,
                                    "output");
    }
}

void PadQueueDescriptor::Validate(const WorkloadInfo& workloadInfo) const
{
    const std::string descriptorName{"PadQueueDescriptor"};

    ValidateNumInputs(workloadInfo,  descriptorName, 1);
    ValidateNumOutputs(workloadInfo, descriptorName, 1);

    const TensorInfo& inputTensorInfo  = workloadInfo.m_InputTensorInfos[0];
    const TensorInfo& outputTensorInfo = workloadInfo.m_OutputTensorInfos[0];

    // input and output should have the same number of dimensions
    ValidateTensorNumDimensions(outputTensorInfo, descriptorName, inputTensorInfo.GetNumDimensions(), "output");

    // there should be entry in the pad list for each dimension in the input tensor
    if (m_Parameters.m_PadList.size() != inputTensorInfo.GetNumDimensions()) {
        throw InvalidArgumentException(descriptorName + ":Pad List should contain the same number of entries "
                                       "as there are dimensions in the input tensor that is " +
                                       std::to_string(inputTensorInfo.GetNumDimensions()) + " entries " +
                                       " not " + std::to_string(m_Parameters.m_PadList.size()) + " entries.");
    }
}

void QuantizeQueueDescriptor::Validate(const WorkloadInfo& workloadInfo) const
{
    const std::string descriptorName{"QuantizeQueueDescriptor"};

    ValidateNumInputs(workloadInfo,  descriptorName, 1);
    ValidateNumOutputs(workloadInfo, descriptorName, 1);

    const TensorInfo& inputTensorInfo  = workloadInfo.m_InputTensorInfos[0];
    const TensorInfo& outputTensorInfo = workloadInfo.m_OutputTensorInfos[0];

    if (inputTensorInfo.GetDataType() != DataType::Float32)
    {
        throw InvalidArgumentException(descriptorName + ": Quantize only accepts Float32 inputs.");
    }

    if (outputTensorInfo.GetDataType() != DataType::QuantisedAsymm8 &&
        outputTensorInfo.GetDataType() != DataType::QuantisedSymm16)
    {
        throw InvalidArgumentException(descriptorName + ": Output of quantized layer must be quantized type.");
    }
}

void BatchToSpaceNdQueueDescriptor::Validate(const WorkloadInfo& workloadInfo) const
{
    const std::string descriptorName{"BatchToSpaceNdQueueDescriptor"};

    ValidateNumInputs(workloadInfo,  descriptorName, 1);
    ValidateNumOutputs(workloadInfo, descriptorName, 1);

    const TensorInfo& inputTensorInfo  = workloadInfo.m_InputTensorInfos[0];
    const TensorInfo& outputTensorInfo = workloadInfo.m_OutputTensorInfos[0];

    std::vector<DataType> supportedTypes =
    {
            DataType::Float32,
            DataType::QuantisedAsymm8,
            DataType::QuantisedSymm16
    };

    ValidateDataTypes(inputTensorInfo, supportedTypes, descriptorName);
    ValidateTensorDataTypesMatch(inputTensorInfo, outputTensorInfo, descriptorName, "input", "output");
}

void StridedSliceQueueDescriptor::Validate(const WorkloadInfo& workloadInfo) const
{
    const std::string descriptorName{"StridedSliceQueueDescriptor"};

    ValidateNumInputs(workloadInfo,  descriptorName, 1);
    ValidateNumOutputs(workloadInfo, descriptorName, 1);

    const TensorInfo& inputTensorInfo  = workloadInfo.m_InputTensorInfos[0];
    const TensorInfo& outputTensorInfo = workloadInfo.m_OutputTensorInfos[0];

    std::vector<DataType> supportedTypes =
    {
        DataType::Float16,
        DataType::Float32,
        DataType::QuantisedAsymm8,
        DataType::QuantisedSymm16
    };

    ValidateDataTypes(inputTensorInfo, supportedTypes, descriptorName);
    ValidateTensorDataTypesMatch(inputTensorInfo, outputTensorInfo, descriptorName, "input", "output");

    ValidateTensorQuantizationSpace(inputTensorInfo, outputTensorInfo, descriptorName, "input", "output");

    const uint32_t rank = inputTensorInfo.GetNumDimensions();
    if (rank > 4)
    {
        throw InvalidArgumentException(descriptorName + ": Input tensors with rank greater than 4 are not supported.");
    }

    // Begin, End & Stride length must be of rank(input0)
    if (m_Parameters.m_Begin.size() != rank)
    {
        throw InvalidArgumentException(descriptorName + ": Begin length must be of rank " + std::to_string(rank));
    }

    if (m_Parameters.m_End.size() != rank)
    {
        throw InvalidArgumentException(descriptorName + ": End length must be of rank " + std::to_string(rank));
    }

    if (m_Parameters.m_Stride.size() != rank)
    {
        throw InvalidArgumentException(descriptorName + ": Stride length must be of rank " + std::to_string(rank));
    }

    // Stride entries must be non-zero
    for (auto& stride : m_Parameters.m_Stride)
    {
        if (stride == 0)
        {
            throw InvalidArgumentException(descriptorName + ": Stride entries must be non-zero.");
        }
    }
}

void MinimumQueueDescriptor::Validate(const WorkloadInfo& workloadInfo) const
{
    const std::string descriptorName{"MinimumQueueDescriptor"};

    ValidateNumInputs(workloadInfo,  descriptorName, 2);
    ValidateNumOutputs(workloadInfo, descriptorName, 1);

    const TensorInfo& inputTensorInfo0 = workloadInfo.m_InputTensorInfos[0];
    const TensorInfo& inputTensorInfo1 = workloadInfo.m_InputTensorInfos[1];
    const TensorInfo& outputTensorInfo = workloadInfo.m_OutputTensorInfos[0];

    std::vector<DataType> supportedTypes =
    {
        DataType::Float32,
        DataType::QuantisedAsymm8,
        DataType::QuantisedSymm16
    };

    ValidateDataTypes(inputTensorInfo0, supportedTypes, descriptorName);
    ValidateDataTypes(inputTensorInfo1, supportedTypes, descriptorName);
    ValidateDataTypes(outputTensorInfo, supportedTypes, descriptorName);

    ValidateBroadcastTensorShapesMatch(inputTensorInfo0,
                                       inputTensorInfo1,
                                       outputTensorInfo,
                                       descriptorName,
                                       "input_0",
                                       "input_1");
}

void DebugQueueDescriptor::Validate(const WorkloadInfo& workloadInfo) const
{
    const std::string descriptorName{"DebugQueueDescriptor"};

    ValidateNumInputs(workloadInfo,  descriptorName, 1);
    ValidateNumOutputs(workloadInfo, descriptorName, 1);
}

void EqualQueueDescriptor::Validate(const WorkloadInfo& workloadInfo) const
{
    const std::string descriptorName{"EqualQueueDescriptor"};

    ValidateNumInputs(workloadInfo,  descriptorName, 2);
    ValidateNumOutputs(workloadInfo, descriptorName, 1);

    const TensorInfo& inputTensorInfo0 = workloadInfo.m_InputTensorInfos[0];
    const TensorInfo& inputTensorInfo1 = workloadInfo.m_InputTensorInfos[1];
    const TensorInfo& outputTensorInfo = workloadInfo.m_OutputTensorInfos[0];

    ValidateBroadcastTensorShapesMatch(inputTensorInfo0,
                                       inputTensorInfo1,
                                       outputTensorInfo,
                                       descriptorName,
                                       "input_0",
                                       "input_1");

    if (outputTensorInfo.GetDataType() != DataType::Boolean)
    {
        throw InvalidArgumentException(descriptorName + ": Output tensor type must be Boolean.");
    }
}

void GreaterQueueDescriptor::Validate(const WorkloadInfo& workloadInfo) const
{
    const std::string descriptorName{"GreaterQueueDescriptor"};

    ValidateNumInputs(workloadInfo,  descriptorName, 2);
    ValidateNumOutputs(workloadInfo, descriptorName, 1);

    const TensorInfo& inputTensorInfo0 = workloadInfo.m_InputTensorInfos[0];
    const TensorInfo& inputTensorInfo1 = workloadInfo.m_InputTensorInfos[1];
    const TensorInfo& outputTensorInfo = workloadInfo.m_OutputTensorInfos[0];

    ValidateBroadcastTensorShapesMatch(inputTensorInfo0,
                                       inputTensorInfo1,
                                       outputTensorInfo,
                                       descriptorName,
                                       "input_0",
                                       "input_1");

    if (outputTensorInfo.GetDataType() != DataType::Boolean)
    {
        throw InvalidArgumentException(descriptorName + ": Output tensor type must be Boolean.");
    }
}

void RsqrtQueueDescriptor::Validate(const WorkloadInfo& workloadInfo) const
{
    const std::string descriptorName{"RsqrtQueueDescriptor"};

    ValidateNumInputs(workloadInfo,  descriptorName, 1);
    ValidateNumOutputs(workloadInfo, descriptorName, 1);

    const TensorInfo& inputTensorInfo  = workloadInfo.m_InputTensorInfos[0];
    const TensorInfo& outputTensorInfo = workloadInfo.m_OutputTensorInfos[0];

    ValidateTensorShapesMatch(inputTensorInfo, outputTensorInfo, descriptorName, "input", "output");

    std::vector<DataType> supportedTypes =
    {
            DataType::Float16,
            DataType::Float32,
            DataType::QuantisedAsymm8,
            DataType::QuantisedSymm16
    };

    ValidateDataTypes(inputTensorInfo, supportedTypes, descriptorName);
    ValidateTensorDataTypesMatch(inputTensorInfo, outputTensorInfo, descriptorName, "input", "output");
}

void GatherQueueDescriptor::Validate(const WorkloadInfo& workloadInfo) const
{
    const std::string descriptorName{"GatherQueueDescriptor"};

    ValidateNumInputs(workloadInfo,  descriptorName, 2);
    ValidateNumOutputs(workloadInfo, descriptorName, 1);

    const TensorInfo& indicesTensorInfo = workloadInfo.m_InputTensorInfos[1];
    if (indicesTensorInfo.GetDataType() != DataType::Signed32)
    {
        throw InvalidArgumentException(descriptorName + ": Indices tensor type must be Int32.");
    }

    const TensorInfo& inputTensorInfo  = workloadInfo.m_InputTensorInfos[0];
    const TensorInfo& outputTensorInfo = workloadInfo.m_OutputTensorInfos[0];

    std::vector<DataType> supportedTypes =
    {
            DataType::Float16,
            DataType::Float32,
            DataType::QuantisedAsymm8,
            DataType::QuantisedSymm16
    };

    ValidateDataTypes(inputTensorInfo, supportedTypes, descriptorName);

    ValidateTensorDataTypesMatch(inputTensorInfo, outputTensorInfo, descriptorName, "input", "output");

    unsigned int outputDim  = inputTensorInfo.GetNumDimensions() + indicesTensorInfo.GetNumDimensions() - 1;
    ValidateTensorNumDimensions(outputTensorInfo, descriptorName, outputDim, "output");
}

void DetectionPostProcessQueueDescriptor::Validate(const WorkloadInfo& workloadInfo) const
{
    const std::string& descriptorName{"DetectionPostProcessQueueDescriptor"};

    ValidateNumInputs(workloadInfo, descriptorName, 2);

    if (workloadInfo.m_OutputTensorInfos.size() != 4)
    {
        throw InvalidArgumentException(descriptorName + ": Requires exactly four outputs. " +
                                       to_string(workloadInfo.m_OutputTensorInfos.size()) + " has been provided.");
    }

    if (m_Anchors == nullptr)
    {
        throw InvalidArgumentException(descriptorName + ": Anchors tensor descriptor is missing.");
    }

    const TensorInfo& boxEncodingsInfo =  workloadInfo.m_InputTensorInfos[0];
    const TensorInfo& scoresInfo       =  workloadInfo.m_InputTensorInfos[1];
    const TensorInfo& anchorsInfo      = m_Anchors->GetTensorInfo();

    const TensorInfo& detectionBoxesInfo   = workloadInfo.m_OutputTensorInfos[0];
    const TensorInfo& detectionClassesInfo = workloadInfo.m_OutputTensorInfos[1];
    const TensorInfo& detectionScoresInfo  = workloadInfo.m_OutputTensorInfos[2];
    const TensorInfo& numDetectionsInfo    = workloadInfo.m_OutputTensorInfos[3];

    ValidateTensorNumDimensions(boxEncodingsInfo, descriptorName, 3, "box encodings");
    ValidateTensorNumDimensions(scoresInfo, descriptorName, 3, "scores");
    ValidateTensorNumDimensions(anchorsInfo, descriptorName, 2, "anchors");

    const std::vector<DataType> supportedInputTypes =
    {
        DataType::Float32,
        DataType::QuantisedAsymm8,
        DataType::QuantisedSymm16
    };

    ValidateDataTypes(boxEncodingsInfo, supportedInputTypes, descriptorName);
    ValidateDataTypes(scoresInfo, supportedInputTypes, descriptorName);
    ValidateDataTypes(anchorsInfo, supportedInputTypes, descriptorName);

    ValidateTensorNumDimensions(detectionBoxesInfo, descriptorName, 3, "detection boxes");
    ValidateTensorNumDimensions(detectionScoresInfo, descriptorName, 2, "detection scores");
    ValidateTensorNumDimensions(detectionClassesInfo, descriptorName, 2, "detection classes");
    ValidateTensorNumDimensions(numDetectionsInfo, descriptorName, 1, "num detections");

    // NOTE: Output is always Float32 regardless of input type
    ValidateTensorDataType(detectionBoxesInfo, DataType::Float32, descriptorName, "detection boxes");
    ValidateTensorDataType(detectionScoresInfo, DataType::Float32, descriptorName, "detection scores");
    ValidateTensorDataType(detectionClassesInfo, DataType::Float32, descriptorName, "detection classes");
    ValidateTensorDataType(numDetectionsInfo, DataType::Float32, descriptorName, "num detections");

    if (m_Parameters.m_NmsIouThreshold <= 0.0f || m_Parameters.m_NmsIouThreshold > 1.0f)
    {
        throw InvalidArgumentException(descriptorName + ": Intersection over union threshold "
                                       "must be positive and less than or equal to 1.");
    }

    if (scoresInfo.GetShape()[2] != m_Parameters.m_NumClasses + 1)
    {
        throw InvalidArgumentException(descriptorName + ": Number of classes with background "
                                       "should be equal to number of classes + 1.");
    }
}

void DequantizeQueueDescriptor::Validate(const WorkloadInfo& workloadInfo) const
{
    const std::string& descriptorName{"DequantizeQueueDescriptor"};

    ValidateNumInputs(workloadInfo,  descriptorName, 1);
    ValidateNumOutputs(workloadInfo, descriptorName, 1);

    const TensorInfo& inputTensorInfo  = workloadInfo.m_InputTensorInfos[0];
    const TensorInfo& outputTensorInfo = workloadInfo.m_OutputTensorInfos[0];

    if (inputTensorInfo.GetDataType() != DataType::QuantisedAsymm8 &&
        inputTensorInfo.GetDataType() != DataType::QuantisedSymm16)
    {
        throw InvalidArgumentException(descriptorName + ": Input to dequantize layer must be quantized type.");
    }

    if (outputTensorInfo.GetDataType() != DataType::Float32)
    {
        throw InvalidArgumentException(descriptorName + ": Output of dequantize layer must be Float32 type.");
    }
}

void MergeQueueDescriptor::Validate(const WorkloadInfo& workloadInfo) const
{
    const std::string& descriptorName{"MergeQueueDescriptor"};

    ValidateNumInputs(workloadInfo,  descriptorName, 2);
    ValidateNumOutputs(workloadInfo, descriptorName, 1);

    const TensorInfo& inputTensorInfo0 = workloadInfo.m_InputTensorInfos[0];
    const TensorInfo& inputTensorInfo1 = workloadInfo.m_InputTensorInfos[1];
    const TensorInfo& outputTensorInfo = workloadInfo.m_OutputTensorInfos[0];

    ValidateTensorShapesMatch(inputTensorInfo0, inputTensorInfo1, descriptorName, "input_0", "input_1");
    ValidateTensorShapesMatch(inputTensorInfo0, outputTensorInfo, descriptorName, "input_0", "output");

    ValidateTensorDataTypesMatch(inputTensorInfo0, inputTensorInfo1, descriptorName, "input_0", "input_1");
    ValidateTensorDataTypesMatch(inputTensorInfo0, outputTensorInfo, descriptorName, "input_0", "output");
}

void SwitchQueueDescriptor::Validate(const WorkloadInfo& workloadInfo) const
{
    const std::string& descriptorName{"SwitchQueueDescriptor"};

    ValidateNumInputs(workloadInfo,  descriptorName, 2);
    ValidateNumOutputs(workloadInfo, descriptorName, 2);

    const TensorInfo& inputTensorInfo0 = workloadInfo.m_InputTensorInfos[0];
    const TensorInfo& inputTensorInfo1 = workloadInfo.m_InputTensorInfos[1];

    const TensorInfo& outputTensorInfo0 = workloadInfo.m_OutputTensorInfos[0];
    const TensorInfo& outputTensorInfo1 = workloadInfo.m_OutputTensorInfos[1];

    std::vector<DataType> supportedTypes =
    {
        DataType::Float32,
        DataType::QuantisedAsymm8,
        DataType::QuantisedSymm16
    };

    ValidateDataTypes(inputTensorInfo0, supportedTypes, descriptorName);
    ValidateDataTypes(inputTensorInfo1, supportedTypes, descriptorName);

    ValidateDataTypes(outputTensorInfo0, supportedTypes, descriptorName);
    ValidateDataTypes(outputTensorInfo1, supportedTypes, descriptorName);

    ValidateTensorShapesMatch(inputTensorInfo0,
                              outputTensorInfo0,
                              descriptorName,
                              "input_0",
                              "output_0");

    ValidateTensorShapesMatch(inputTensorInfo0,
                              outputTensorInfo1,
                              descriptorName,
                              "input_0",
                              "output_1");
}

void PreCompiledQueueDescriptor::Validate(const WorkloadInfo& workloadInfo) const
{
    // This is internally generated so it should not need validation.
}

void PreluQueueDescriptor::Validate(const WorkloadInfo& workloadInfo) const
{
    const std::string& descriptorName{"PreluQueueDescriptor"};

    ValidateNumInputs(workloadInfo,  descriptorName, 2);
    ValidateNumOutputs(workloadInfo, descriptorName, 1);

    const TensorInfo& inputTensorInfo  = workloadInfo.m_InputTensorInfos[0];
    const TensorInfo& alphaTensorInfo  = workloadInfo.m_InputTensorInfos[1];
    const TensorInfo& outputTensorInfo = workloadInfo.m_OutputTensorInfos[0];

    std::vector<DataType> supportedTypes
    {
        DataType::Float16,
        DataType::Float32,
        DataType::QuantisedAsymm8,
        DataType::QuantisedSymm16
    };

    ValidateDataTypes(inputTensorInfo, supportedTypes, descriptorName);
    ValidateDataTypes(alphaTensorInfo, supportedTypes, descriptorName);

    ValidateDataTypes(outputTensorInfo, supportedTypes, descriptorName);

    ValidateTensorDataTypesMatch(inputTensorInfo, alphaTensorInfo,  descriptorName, "input", "alpha");
    ValidateTensorDataTypesMatch(inputTensorInfo, outputTensorInfo, descriptorName, "input", "ouptut");

    ValidateBroadcastTensorShapesMatch(inputTensorInfo,
                                       alphaTensorInfo,
                                       outputTensorInfo,
                                       descriptorName,
                                       "input",
                                       "alpha");
}

void TransposeConvolution2dQueueDescriptor::Validate(const WorkloadInfo& workloadInfo) const
{
    const std::string descriptorName{"TransposeConvolution2dQueueDescriptor"};

    ValidateNumInputs(workloadInfo,  descriptorName, 1);
    ValidateNumOutputs(workloadInfo, descriptorName, 1);

    const TensorInfo& inputTensorInfo  = workloadInfo.m_InputTensorInfos[0];
    const TensorInfo& outputTensorInfo = workloadInfo.m_OutputTensorInfos[0];

    ValidateTensorNumDimensions(inputTensorInfo,  descriptorName, 4, "input");
    ValidateTensorNumDimensions(outputTensorInfo, descriptorName, 4, "output");

    ValidatePointer(m_Weight, descriptorName, "weight");

    const TensorInfo& weightTensorInfo = m_Weight->GetTensorInfo();
    ValidateTensorNumDimensions(weightTensorInfo, descriptorName, 4, "weight");
    ValidateTensorDataType(weightTensorInfo, inputTensorInfo.GetDataType(), descriptorName, "weight");

    if (m_Parameters.m_BiasEnabled)
    {
        ValidatePointer(m_Bias, descriptorName, "bias");

        const TensorInfo& biasTensorInfo = m_Bias->GetTensorInfo();
        ValidateTensorNumDimensions(biasTensorInfo, descriptorName, 1, "bias");

        ValidateTensorDataType(biasTensorInfo,
                               GetBiasDataType(inputTensorInfo.GetDataType()),
                               descriptorName,
                               "bias");

        ValidateBiasTensorQuantization(biasTensorInfo, inputTensorInfo, weightTensorInfo, descriptorName);
    }
}

} // namespace armnn