src/runtime/NEON/functions/NEGEMMConvolutionLayer.cpp

/*
 * Copyright (c) 2017-2018 ARM Limited.
 *
 * SPDX-License-Identifier: MIT
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
#include "arm_compute/runtime/NEON/functions/NEGEMMConvolutionLayer.h"

#include "arm_compute/core/PixelValue.h"
#include "arm_compute/core/Size2D.h"
#include "arm_compute/core/Utils.h"
#include "arm_compute/core/Validate.h"
#include "arm_compute/core/utils/quantization/AsymmHelpers.h"
#include "arm_compute/runtime/NEON/NEScheduler.h"
#include "support/ToolchainSupport.h"

#include <cmath>
#include <tuple>

namespace
{
arm_compute::TensorShape get_reshaped_weights_shape(const arm_compute::ITensorInfo *weights, bool append_bias)
{
    const unsigned int mat_weights_cols = weights->dimension(3);
    const unsigned int mat_weights_rows = weights->dimension(0) * weights->dimension(1) * weights->dimension(2) + (append_bias ? 1 : 0);
    return arm_compute::TensorShape(mat_weights_cols, mat_weights_rows);
}
} // namespace

namespace arm_compute
{
NEConvolutionLayerReshapeWeights::NEConvolutionLayerReshapeWeights(std::shared_ptr<IMemoryManager> memory_manager)
    : _memory_group(std::move(memory_manager)), _weights_reshape_kernel(), _weights_transposed_kernel(), _weights_reshaped(), _transpose1xW(false)
{
}

void NEConvolutionLayerReshapeWeights::configure(const ITensor *weights, const ITensor *biases, ITensor *output, bool transpose1xW)
{
    // Perform validation step
    ARM_COMPUTE_ERROR_ON_NULLPTR(weights, output);
    ARM_COMPUTE_ERROR_THROW_ON(NEConvolutionLayerReshapeWeights::validate(weights->info(),
                                                                          (biases != nullptr) ? biases->info() : nullptr,
                                                                          output->info(),
                                                                          transpose1xW));

    // Check if bias are present, if yes they will be embedded to the weights matrix
    const bool append_biases = (biases != nullptr) && !is_data_type_quantized_asymmetric(weights->info()->data_type());
    //const unsigned bias_element  = (append_biases) ? 1 : 0;
    const ITensor *biases_to_use = (append_biases) ? biases : nullptr;

    _transpose1xW = transpose1xW;

    if(transpose1xW)
    {
        // Create tensor to store the reshaped weights
        TensorInfo info_wr = weights->info()->clone()->set_is_resizable(true).reset_padding().set_tensor_shape(get_reshaped_weights_shape(weights->info(), append_biases));

        _weights_reshaped.allocator()->init(info_wr);
        _memory_group.manage(&_weights_reshaped);

        _weights_reshape_kernel.configure(weights, biases, &_weights_reshaped);
        _weights_transposed_kernel.configure(&_weights_reshaped, output);

        _weights_reshaped.allocator()->allocate();
    }
    else
    {
        _weights_reshape_kernel.configure(weights, biases_to_use, output);
    }

    output->info()->set_quantization_info(weights->info()->quantization_info());
}

Status NEConvolutionLayerReshapeWeights::validate(const ITensorInfo *weights, const ITensorInfo *biases, const ITensorInfo *output, bool transpose1xW)
{
    ARM_COMPUTE_RETURN_ERROR_ON_DATA_TYPE_CHANNEL_NOT_IN(weights, 1, DataType::QS8, DataType::QASYMM8, DataType::QS16, DataType::F16, DataType::F32);
    ARM_COMPUTE_RETURN_ERROR_ON(weights->num_dimensions() > 4);
    if(!is_data_type_quantized_asymmetric(weights->data_type()))
    {
        ARM_COMPUTE_RETURN_ERROR_ON_MISMATCHING_DATA_TYPES(weights, output);
        ARM_COMPUTE_RETURN_ERROR_ON_MISMATCHING_FIXED_POINT(weights, output);
    }
    // Check if bias are present, if yes they will be embedded to the weights matrix
    const bool append_bias = (biases != nullptr);

    if(append_bias)
    {
        ARM_COMPUTE_RETURN_ERROR_ON(is_data_type_quantized_asymmetric(weights->data_type()));
        ARM_COMPUTE_RETURN_ERROR_ON_MISMATCHING_DATA_TYPES(weights, biases);
        ARM_COMPUTE_RETURN_ERROR_ON_MISMATCHING_FIXED_POINT(weights, biases);
        ARM_COMPUTE_RETURN_ERROR_ON(biases->dimension(0) != weights->dimension(3));
        ARM_COMPUTE_RETURN_ERROR_ON(biases->num_dimensions() > 1);
    }

    // Checks performed when biases are present
    if(append_bias)
    {
        ARM_COMPUTE_RETURN_ERROR_ON_MISMATCHING_DATA_TYPES(weights, biases);
        ARM_COMPUTE_RETURN_ERROR_ON(biases->dimension(0) != weights->dimension(3));
        ARM_COMPUTE_RETURN_ERROR_ON(biases->num_dimensions() > 1);
    }

    if(transpose1xW)
    {
        TensorInfo weights_reshaped = weights->clone()->set_tensor_shape(get_reshaped_weights_shape(weights, append_bias));
        ARM_COMPUTE_RETURN_ON_ERROR(NEWeightsReshapeKernel::validate(weights, biases, &weights_reshaped));
        ARM_COMPUTE_RETURN_ON_ERROR(NEGEMMTranspose1xWKernel::validate(&weights_reshaped, output));
    }
    else
    {
        ARM_COMPUTE_RETURN_ON_ERROR(NEWeightsReshapeKernel::validate(weights, biases, output));
    }

    return Status{};
}

void NEConvolutionLayerReshapeWeights::run()
{
    _memory_group.acquire();

    NEScheduler::get().schedule(&_weights_reshape_kernel, 3);

    if(_transpose1xW)
    {
        NEScheduler::get().schedule(&_weights_transposed_kernel, Window::DimY);
    }

    _memory_group.release();
}

namespace
{
TensorShape get_reshaped_weights_shape_conv(const ITensorInfo *weights, bool append_bias, bool is_fully_connected_convolution)
{
    unsigned int mat_weights_cols = weights->dimension(3);
    unsigned int mat_weights_rows = weights->dimension(0) * weights->dimension(1) * weights->dimension(2) + (append_bias ? 1 : 0);

    if(is_fully_connected_convolution)
    {
        // Create tensor to store the reshaped weights
        return TensorShape(mat_weights_cols, mat_weights_rows);
    }
    else
    {
        // Create tensor to store transposed weights
        const float transpose_width = 16.0f / weights->element_size();
        return TensorShape(mat_weights_rows * static_cast<unsigned int>(transpose_width), static_cast<unsigned int>(std::ceil(mat_weights_cols / transpose_width)));
    }
}

Status validate_and_initialize_values(const ITensorInfo *input, const ITensorInfo *weights, const ITensorInfo *biases, const PadStrideInfo &conv_info, const WeightsInfo &weights_info,
                                      const ActivationLayerInfo &act_info, DataType &dt,
                                      bool &append_bias, bool &skip_im2col,
                                      bool &are_weights_reshaped, unsigned int &kernel_width, unsigned int &kernel_height,
                                      bool &is_fully_connected_convolution, bool &is_interleaved, bool &is_quantized, bool &is_activationlayer_enabled,
                                      unsigned int &mat_weights_cols, unsigned int &mat_weights_rows,
                                      unsigned int &conv_w, unsigned int &conv_h, const Size2D &dilation)
{
    ARM_COMPUTE_RETURN_ERROR_ON_DATA_TYPE_CHANNEL_NOT_IN(input, 1, DataType::QS8, DataType::QASYMM8, DataType::QS16, DataType::F16, DataType::F32);
    ARM_COMPUTE_RETURN_ERROR_ON_MISMATCHING_DATA_TYPES(input, weights);
    ARM_COMPUTE_RETURN_ERROR_ON_MISMATCHING_FIXED_POINT(input, weights);
    ARM_COMPUTE_RETURN_ERROR_ON_MISMATCHING_DATA_LAYOUT(input, weights);

    DataLayout data_layout = input->data_layout();
    const int  idx_width   = get_data_layout_dimension_index(data_layout, DataLayoutDimension::WIDTH);
    const int  idx_height  = get_data_layout_dimension_index(data_layout, DataLayoutDimension::HEIGHT);
    const int  idx_channel = get_data_layout_dimension_index(data_layout, DataLayoutDimension::CHANNEL);

    ARM_COMPUTE_RETURN_ERROR_ON(!weights_info.are_reshaped() && weights->dimension(idx_channel) != input->dimension(idx_channel));
    ARM_COMPUTE_RETURN_ERROR_ON(weights->num_dimensions() > 4);
    ARM_COMPUTE_RETURN_ERROR_ON(weights_info.are_reshaped() && is_data_type_quantized_asymmetric(input->data_type()));
    ARM_COMPUTE_RETURN_ERROR_ON_MSG(data_layout == DataLayout::NHWC && input->data_type() != DataType::F32, "NHWC is only supported for FP32 data type.");

    dt           = input->data_type();
    is_quantized = is_data_type_quantized_asymmetric(dt);

    if(biases != nullptr)
    {
        if(is_quantized)
        {
            ARM_COMPUTE_RETURN_ERROR_ON_DATA_TYPE_CHANNEL_NOT_IN(biases, 1, DataType::S32);
        }
        else
        {
            ARM_COMPUTE_RETURN_ERROR_ON_MISMATCHING_DATA_TYPES(input, biases);
        }
        ARM_COMPUTE_RETURN_ERROR_ON_MISMATCHING_FIXED_POINT(input, biases);
        ARM_COMPUTE_RETURN_ERROR_ON(!weights_info.are_reshaped() && biases->dimension(0) != weights->dimension(3));
        ARM_COMPUTE_RETURN_ERROR_ON(biases->num_dimensions() > 1);
    }

    // If we have 1x1 convolution and data layout is NHWC we can disable im2col
    append_bias          = (biases != nullptr) && (!is_quantized);
    are_weights_reshaped = weights_info.are_reshaped();
    kernel_width         = (are_weights_reshaped) ? weights_info.kernel_size().first : weights->dimension(idx_width);
    kernel_height        = (are_weights_reshaped) ? weights_info.kernel_size().second : weights->dimension(idx_height);
    mat_weights_cols     = weights->dimension(3);
    mat_weights_rows     = weights->dimension(idx_width) * weights->dimension(idx_height) * weights->dimension(idx_channel) + ((append_bias && !skip_im2col) ? 1 : 0);
    skip_im2col          = (data_layout == DataLayout::NHWC && kernel_width == 1 && kernel_height == 1);

    std::tie(conv_w, conv_h) = scaled_dimensions(input->dimension(idx_width), input->dimension(idx_height), kernel_width, kernel_height,
                                                 conv_info, dilation);

    // Check if its a "fully connected" convolution
    is_fully_connected_convolution = ((conv_w == 1) && (conv_h == 1));
    is_interleaved                 = (!is_fully_connected_convolution && !is_quantized);
    is_activationlayer_enabled     = act_info.enabled();

    return Status{};
}
} // namespace

NEGEMMConvolutionLayer::NEGEMMConvolutionLayer(const std::shared_ptr<IMemoryManager> &memory_manager)
    : _asm_glue(), _memory_group(memory_manager), _input_im2col_kernel(), _input_interleave_kernel(), _reshape_weights(), _mm_kernel(), _mm_gemmlowp(memory_manager), _gemmlowp_output_stage(),
      _output_col2im_kernel(), _activationlayer_function(), _add_bias_kernel(), _original_weights(nullptr), _input_im2col_reshaped(), _input_interleaved_reshaped(), _weights_reshaped(), _gemm_output(),
      _tmp_output(), _workspace(), _B_pretransposed(), _data_layout(DataLayout::NCHW), _append_bias(false), _is_fully_connected_convolution(false), _are_weights_reshaped(false), _is_quantized(false),
      _is_interleaved(false), _is_activationlayer_enabled(false), _skip_im2col(false), _is_prepared(false)
{
}

void NEGEMMConvolutionLayer::configure_mm(const ITensor *input, const ITensor *weights, ITensor *output, bool is_interleaved, const GEMMReshapeInfo &reshape_info)
{
    if(_is_quantized)
    {
        // Since we need negative offsets for computing convolution, we need to change QuantizationInfo()
        // Extract and negate input and weights offset
        const QuantizationInfo input_quantization_info   = input->info()->quantization_info();
        const QuantizationInfo weights_quantization_info = weights->info()->quantization_info();

        input->info()->set_quantization_info(QuantizationInfo(input_quantization_info.scale, -input_quantization_info.offset));
        weights->info()->set_quantization_info(QuantizationInfo(weights_quantization_info.scale, -weights_quantization_info.offset));

        _mm_gemmlowp.configure(input, weights, output, GEMMInfo(false, false, true /* Reshape weights only for the first run*/));

        // Revert back QuantizatioInfo as input and weights could be used in other convolution layers
        input->info()->set_quantization_info(input_quantization_info);
        weights->info()->set_quantization_info(weights_quantization_info);
    }
    else
    {
        _mm_kernel.configure(input, weights, output, 1.f, is_interleaved, reshape_info);
    }
}

void NEGEMMConvolutionLayer::configure(const ITensor *input, const ITensor *weights, const ITensor *biases, ITensor *output, const PadStrideInfo &conv_info, const WeightsInfo &weights_info,
                                       const Size2D &dilation, const ActivationLayerInfo &act_info)
{
    // Perform validate step
    ARM_COMPUTE_ERROR_ON_NULLPTR(input, weights, output);

    DataType     dt{};
    unsigned int kernel_width     = 0;
    unsigned int kernel_height    = 0;
    unsigned int mat_weights_cols = 0;
    unsigned int mat_weights_rows = 0;
    unsigned int conv_w           = 0;
    unsigned int conv_h           = 0;

    _data_layout           = input->info()->data_layout();
    const bool is_nhwc     = _data_layout == DataLayout::NHWC;
    const int  idx_width   = get_data_layout_dimension_index(_data_layout, DataLayoutDimension::WIDTH);
    const int  idx_height  = get_data_layout_dimension_index(_data_layout, DataLayoutDimension::HEIGHT);
    const int  idx_channel = get_data_layout_dimension_index(_data_layout, DataLayoutDimension::CHANNEL);

    Status status = validate_and_initialize_values(input->info(), weights->info(), (biases == nullptr) ? nullptr : biases->info(), conv_info, weights_info, act_info, dt, _append_bias, _skip_im2col,
                                                   _are_weights_reshaped,
                                                   kernel_width, kernel_height,
                                                   _is_fully_connected_convolution, _is_interleaved, _is_quantized, _is_activationlayer_enabled,
                                                   mat_weights_cols, mat_weights_rows, conv_w, conv_h, dilation);

    ARM_COMPUTE_ERROR_THROW_ON(status);

    _is_prepared                            = false;
    _original_weights                       = weights;
    const unsigned int fixed_point_position = input->info()->fixed_point_position();
    const ITensor     *biases_to_use        = (_append_bias) ? biases : nullptr;

    bool run_optimised = dt == DataType::F32;

    // Reshape weights if needed
    if(run_optimised)
    {
        TensorShape reshaped_weights_shape{ mat_weights_cols, mat_weights_rows };

        // Create tensor to store the reshaped weights
        _weights_reshaped.allocator()->init(TensorInfo(reshaped_weights_shape, 1, dt, fixed_point_position));
        _reshape_weights.configure(weights, biases, &_weights_reshaped, false /* 1xW transpose */);
        weights = &_weights_reshaped;
    }
    else
    {
        if(_are_weights_reshaped)
        {
            if(_is_fully_connected_convolution || _is_quantized)
            {
                mat_weights_cols = weights_info.num_kernels();
                mat_weights_rows = weights->info()->dimension(idx_height);
            }
            else
            {
                mat_weights_cols = weights_info.num_kernels();
                mat_weights_rows = weights_info.kernel_size().first * weights_info.kernel_size().second * input->info()->dimension(idx_channel) + (_append_bias ? 1 : 0);
            }
        }
        else
        {
            TensorShape reshaped_weights_shape;

            if(_is_fully_connected_convolution || _is_quantized)
            {
                reshaped_weights_shape = TensorShape{ mat_weights_cols, mat_weights_rows };
            }
            else
            {
                // Create tensor to store transposed weights
                const float transpose_width = 16.0f / input->info()->element_size();
                reshaped_weights_shape      = TensorShape{ mat_weights_rows *static_cast<unsigned int>(transpose_width),
                                                           static_cast<unsigned int>(std::ceil(mat_weights_cols / transpose_width)) };
            }

            // Create tensor to store the reshaped weights
            _weights_reshaped.allocator()->init(TensorInfo(reshaped_weights_shape, 1, dt, fixed_point_position));
            _reshape_weights.configure(weights, biases_to_use, &_weights_reshaped, _is_interleaved /* 1xW transpose */);
            weights = &_weights_reshaped;
        }
    }

    // In case we skip im2col we have to add bias
    if(!_skip_im2col)
    {
        const unsigned int mat_input_cols = mat_weights_rows;
        const unsigned int mat_input_rows = conv_w * conv_h;

        // Create tensor to store im2col reshaped inputs
        TensorShape shape_im2col(input->info()->tensor_shape());
        shape_im2col.set(0, mat_input_cols);
        shape_im2col.set(1, mat_input_rows);
        shape_im2col.set(2, 1);
        _input_im2col_reshaped.allocator()->init(input->info()->clone()->set_is_resizable(true).reset_padding().set_tensor_shape(shape_im2col));
        _memory_group.manage(&_input_im2col_reshaped);

        // Create tensor (interleave) to prepare input tensor for GEMM
        if(!_is_fully_connected_convolution && !run_optimised && _is_interleaved)
        {
            TensorShape shape_interleaved(shape_im2col);
            shape_interleaved.set(idx_width, shape_interleaved.x() * 4);
            shape_interleaved.set(idx_height, std::ceil(shape_interleaved[idx_height] / 4.f));
            _input_interleaved_reshaped.allocator()->init(input->info()->clone()->set_is_resizable(true).reset_padding().set_tensor_shape(shape_interleaved));
            _memory_group.manage(&_input_interleaved_reshaped);
        }

        // Create GEMM output tensor
        TensorShape shape_gemm(_input_im2col_reshaped.info()->tensor_shape());
        shape_gemm.set(0, mat_weights_cols);
        shape_gemm.set(1, mat_input_rows);
        const DataType gemm_data_type = _is_quantized ? DataType::S32 : dt;
        // GEMM output should be S32 for acquiring raw integer accumulator without quantized postprocessing for quantized asymmetric input.
        TensorInfo info_gemm(shape_gemm, 1, gemm_data_type, input->info()->fixed_point_position());
        info_gemm.set_quantization_info(output->info()->quantization_info());
        _gemm_output.allocator()->init(info_gemm);
        _memory_group.manage(&_gemm_output);

        // Configure im2col
        _input_im2col_kernel.configure(input, &_input_im2col_reshaped, Size2D(kernel_width, kernel_height), conv_info, _append_bias, false, false, dilation);
    }
    else if(_append_bias)
    {
        // Configure add bias kernel
        _add_bias_kernel.configure(output, biases, output, ConvertPolicy::SATURATE);
    }

    // Configure matrix multiply
    if(run_optimised)
    {
        if(!setup_assembly_kernel(_skip_im2col ? input : &_input_im2col_reshaped, weights, is_nhwc ? output : &_gemm_output, 1.f, 0.f, true, _workspace, _B_pretransposed, _memory_group, _asm_glue))
        {
            ARM_COMPUTE_ERROR("setup_assembly_kernel failed.");
        }
    }
    else
    {
        if(_is_interleaved)
        {
            // Configure GEMMInterleave4x4. _input_interleaved_reshaped will be auto configured in the kernel
            _input_interleave_kernel.configure(&_input_im2col_reshaped, &_input_interleaved_reshaped);

            // Configure GEMM
            configure_mm(&_input_interleaved_reshaped, weights, &_gemm_output, _is_interleaved, GEMMReshapeInfo(_input_im2col_reshaped.info()->dimension(idx_height), 0 /* no transpose */,
                                                                                                                _input_im2col_reshaped.info()->dimension(idx_width)));
            _input_interleaved_reshaped.allocator()->allocate();
        }
        else
        {
            configure_mm(&_input_im2col_reshaped, weights, &_gemm_output, _is_interleaved);
        }
    }

    if(!_skip_im2col)
    {
        _input_im2col_reshaped.allocator()->allocate();

        // Configure output stage for quantized case
        if(_is_quantized)
        {
            const QuantizationInfo output_quant_info = (output->info()->total_size() == 0) ? input->info()->quantization_info() : output->info()->quantization_info();

            float multiplier = input->info()->quantization_info().scale * weights->info()->quantization_info().scale / output_quant_info.scale;
            int   output_multiplier, output_shift;
            quantization::calculate_quantized_multiplier_less_than_one(multiplier, &output_multiplier, &output_shift);
            _memory_group.manage(&_tmp_output);
            _gemmlowp_output_stage.configure(&_gemm_output, biases, &_tmp_output, output_multiplier, output_shift, output_quant_info.offset);
        }

        // Configure Col2Im
        if(!is_nhwc)
        {
            _output_col2im_kernel.configure(_is_quantized ? &_tmp_output : &_gemm_output, output, Size2D(conv_w, conv_h));
        }

        if(_is_quantized)
        {
            _tmp_output.allocator()->allocate();
        }
        _gemm_output.allocator()->allocate();
    }

    ARM_COMPUTE_ERROR_ON_MSG((output->info()->dimension(idx_width) != conv_w) || (output->info()->dimension(idx_height) != conv_h), "Output shape does not match the expected one");

    //Configure Activation Layer
    if(_is_activationlayer_enabled)
    {
        _activationlayer_function.configure(output, nullptr, act_info);
    }
}

Status NEGEMMConvolutionLayer::validate(const ITensorInfo *input, const ITensorInfo *weights, const ITensorInfo *biases, const ITensorInfo *output, const PadStrideInfo &conv_info,
                                        const WeightsInfo &weights_info, const Size2D &dilation, const ActivationLayerInfo &act_info)
{
    ARM_COMPUTE_UNUSED(output);

    DataType     dt{};
    bool         append_bias{};
    bool         skip_im2col{};
    bool         are_weights_reshaped{};
    bool         is_fully_connected_convolution{};
    bool         is_interleaved{};
    bool         is_quantized{};
    bool         is_activationlayer_enabled{};
    unsigned int kernel_width     = 0;
    unsigned int kernel_height    = 0;
    unsigned int mat_weights_cols = 0;
    unsigned int mat_weights_rows = 0;
    unsigned int conv_w           = 0;
    unsigned int conv_h           = 0;

    const DataLayout data_layout = input->data_layout();
    const bool       is_nhwc     = data_layout == DataLayout::NHWC;
    const int        idx_width   = get_data_layout_dimension_index(data_layout, DataLayoutDimension::WIDTH);
    const int        idx_height  = get_data_layout_dimension_index(data_layout, DataLayoutDimension::HEIGHT);

    Status status = validate_and_initialize_values(input, weights, biases, conv_info, weights_info, act_info, dt, append_bias, skip_im2col, are_weights_reshaped, kernel_width, kernel_height,
                                                   is_fully_connected_convolution, is_interleaved, is_quantized, is_activationlayer_enabled, mat_weights_cols, mat_weights_rows,
                                                   conv_w, conv_h, dilation);

    const Size2D kernel_weights = Size2D(kernel_width, kernel_height);

    ARM_COMPUTE_RETURN_ON_ERROR(status);

    std::unique_ptr<ITensorInfo> reshaped_weights = weights->clone();
    bool                         optimised_kernel = false;

    if(dt == DataType::F32)
    {
        optimised_kernel = true;
    }

    const unsigned int mat_input_cols = mat_weights_rows;
    const unsigned int mat_input_rows = conv_w * conv_h;
    TensorShape        shape_im2col   = input->tensor_shape();
    shape_im2col.set(0, mat_input_cols);
    shape_im2col.set(1, mat_input_rows);
    shape_im2col.set(2, 1);
    TensorInfo im2_col_info = input->clone()->set_tensor_shape(shape_im2col);

    if(!skip_im2col)
    {
        // Validate im2col
        ARM_COMPUTE_RETURN_ON_ERROR(NEIm2ColKernel::validate(input, &im2_col_info, kernel_weights, conv_info, append_bias, false, false, dilation));
    }
    else if(append_bias)
    {
        // Validate add bias kernel
        ARM_COMPUTE_RETURN_ON_ERROR(NEArithmeticAdditionKernel::validate(output, biases, output, ConvertPolicy::SATURATE));
    }

    // Create GEMM output tensor
    TensorShape shape_gemm(im2_col_info.tensor_shape());
    shape_gemm.set(0, mat_weights_cols);
    shape_gemm.set(1, mat_input_rows);
    TensorInfo gemm_output_info = input->clone()->set_tensor_shape(shape_gemm);

    // Reshape weights if needed
    if(optimised_kernel)
    {
        ARM_COMPUTE_RETURN_ERROR_ON(are_weights_reshaped);

        // Create tensor to store the reshaped weights
        reshaped_weights->set_tensor_shape(get_reshaped_weights_shape_conv(weights, append_bias, is_fully_connected_convolution));
        ARM_COMPUTE_RETURN_ON_ERROR(NEConvolutionLayerReshapeWeights::validate(weights, biases, reshaped_weights.get(), !is_fully_connected_convolution /* 1xW transpose */));
    }
    else if(!is_quantized)
    {
        TensorShape reshaped_weights_shape;

        if(is_fully_connected_convolution || is_quantized)
        {
            reshaped_weights_shape = TensorShape{ mat_weights_cols, mat_weights_rows };
        }
        else
        {
            // Create tensor to store transposed weights
            const float transpose_width = 16.0f / input->element_size();
            reshaped_weights_shape      = TensorShape{ mat_weights_rows *static_cast<unsigned int>(transpose_width),
                                                       static_cast<unsigned int>(std::ceil(mat_weights_cols / transpose_width)) };
        }

        // Create tensor to store the reshaped weights
        reshaped_weights->set_tensor_shape(get_reshaped_weights_shape_conv(weights, append_bias, is_fully_connected_convolution));
        ARM_COMPUTE_RETURN_ON_ERROR(NEConvolutionLayerReshapeWeights::validate(weights, biases, reshaped_weights.get(), !is_fully_connected_convolution /* 1xW transpose */));
        weights = reshaped_weights.get();

        // Validate GEMM interleave and multiply
        if(is_interleaved)
        {
            TensorShape shape_interleaved = shape_im2col;
            shape_interleaved.set(idx_width, shape_interleaved.x() * 4);
            shape_interleaved.set(idx_height, std::ceil(shape_interleaved.y() / 4.f));
            TensorInfo input_interleaved_info = input->clone()->set_tensor_shape(shape_interleaved);
            ARM_COMPUTE_RETURN_ON_ERROR(NEGEMMInterleave4x4Kernel::validate(&im2_col_info, &input_interleaved_info));
            ARM_COMPUTE_RETURN_ON_ERROR(NEGEMMMatrixMultiplyKernel::validate(&input_interleaved_info, weights, &gemm_output_info, 1.f, is_interleaved, GEMMReshapeInfo(shape_im2col[1],            // m
                                                                             weights->tensor_shape()[0], // n
                                                                             shape_im2col[0]) /* k */));
        }
        else
        {
            ARM_COMPUTE_RETURN_ON_ERROR(NEGEMMMatrixMultiplyKernel::validate(&im2_col_info, weights, &gemm_output_info, 1.f, is_interleaved, GEMMReshapeInfo()));
        }
    }
    if(!is_nhwc)
    {
        ARM_COMPUTE_RETURN_ON_ERROR(NECol2ImKernel::validate(&gemm_output_info, output, Size2D(conv_w, conv_h)));
    }

    ARM_COMPUTE_RETURN_ERROR_ON_MSG((output->dimension(idx_width) != conv_w) || (output->dimension(idx_height) != conv_h), "Output shape does not match the expected one");

    if(act_info.enabled())
    {
        ARM_COMPUTE_RETURN_ON_ERROR(NEActivationLayer::validate(output, nullptr, act_info));
    }

    return Status{};
}

void NEGEMMConvolutionLayer::run()
{
    prepare();

    _memory_group.acquire();

    if(!_skip_im2col)
    {
        // Run input reshaping
        unsigned int _y_dim = get_data_layout_dimension_index(_data_layout, DataLayoutDimension::HEIGHT);
        NEScheduler::get().schedule(&_input_im2col_kernel, _y_dim);
    }

    // Runs matrix multiply on reshaped matrices
    if(_asm_glue._optimised_kernel != nullptr)
    {
        _asm_glue.run();
    }
    else
    {
        if(_is_interleaved)
        {
            // Run interleave
            NEScheduler::get().schedule(&_input_interleave_kernel, Window::DimY);
        }

        // Runs matrix multiply on reshaped matrices
        if(_is_quantized)
        {
            _mm_gemmlowp.run();
        }
        else
        {
            NEScheduler::get().schedule(&_mm_kernel, Window::DimY);
        }
    }

    if(_skip_im2col && _append_bias)
    {
        NEScheduler::get().schedule(&_add_bias_kernel, Window::DimY);
    }

    // Run output stage for quantized case
    if(_is_quantized)
    {
        _gemmlowp_output_stage.run();
    }

    // Reshape output matrix
    if(_data_layout == DataLayout::NCHW)
    {
        NEScheduler::get().schedule(&_output_col2im_kernel, Window::DimY);
    }

    if(_is_activationlayer_enabled)
    {
        _activationlayer_function.run();
    }

    _memory_group.release();
}

void NEGEMMConvolutionLayer::prepare()
{
    if(!_is_prepared)
    {
        // Run weights reshaping (Runs once for every configure)
        if(!_are_weights_reshaped)
        {
            ARM_COMPUTE_ERROR_ON(!_original_weights->is_used());

            _weights_reshaped.allocator()->allocate();
            _reshape_weights.run();
            _reshape_weights = NEConvolutionLayerReshapeWeights();
            _original_weights->mark_as_unused();
            _are_weights_reshaped = true;
        }

        // Run GEMM prepare stage
        if(_asm_glue._optimised_kernel)
        {
            _asm_glue.prepare();
        }
        else
        {
            if(_is_quantized)
            {
                _mm_gemmlowp.prepare();
            }
        }

        // Release weights in case buffer is pretransposed
        if(!_weights_reshaped.is_used())
        {
            _weights_reshaped.allocator()->free();
        }

        _is_prepared = true;
    }
}
} // namespace arm_compute