FullyConnectedLayer.cpp

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/*
 * Copyright (c) 2017-2021 Arm Limited.
 *
 * SPDX-License-Identifier: MIT
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 * of this software and associated documentation files (the "Software"), to
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 * 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.
 *
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 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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#include "FullyConnectedLayer.h"
 
#include "arm_compute/core/Types.h"
#include "tests/validation/reference/UtilsQuantizedAsymm.h"
 
#include "arm_compute/core/utils/quantization/AsymmHelpers.h"
 
#include <numeric>
 
namespace arm_compute
{
namespace test
{
namespace validation
{
namespace reference
{
namespace
{
// Vector matrix multiply for floating point
template < typename T, typename TB, typename std::enable_if < is_floating_point<T>::value &&is_floating_point<TB>::value, int >::type = 0 >
void vector_matrix_multiply(const SimpleTensor<T> &src, const SimpleTensor<T> &weights, const SimpleTensor<TB> &bias, SimpleTensor<T> &dst, int offset_src, int offset_dst, int cols_weights,
                            int rows_weights)
{
    const T *src_ptr     = src.data() + offset_src;
    const T *weights_ptr = weights.data();
    const TB *bias_ptr    = bias.data();
    T        *dst_ptr     = dst.data() + offset_dst;
#if defined(_OPENMP)
    #pragma omp parallel for
#endif /* _OPENMP */
    for(int y = 0; y < rows_weights; ++y)
    {
        dst_ptr[y] = std::inner_product(src_ptr, src_ptr + cols_weights, &weights_ptr[cols_weights * y], static_cast<T>(0)) + bias_ptr[y];
    }
}
 
// Vector matrix multiply for quantized type
template < typename T, typename TB, typename std::enable_if < (std::is_same<T, uint8_t>::value || std::is_same<T, int8_t>::value) &&std::is_same<TB, int32_t>::value, int >::type = 0 >
void vector_matrix_multiply(const SimpleTensor<T> &src, const SimpleTensor<T> &weights, const SimpleTensor<TB> &bias, SimpleTensor<T> &dst, int offset_src, int offset_dst,
                            int cols_weights, int rows_weights)
{
    const T *src_ptr     = src.data() + offset_src;
    const T *weights_ptr = weights.data();
    const TB *bias_ptr    = bias.data();
    T        *dst_ptr     = dst.data() + offset_dst;
 
    const UniformQuantizationInfo iq_info = src.quantization_info().uniform();
    const UniformQuantizationInfo wq_info = weights.quantization_info().uniform();
    const UniformQuantizationInfo oq_info = dst.quantization_info().uniform();
 
    const int   input_offset   = -iq_info.offset;
    const float input_scale    = iq_info.scale;
    const int   weights_offset = -wq_info.offset;
    const float weights_scale  = wq_info.scale;
    const int   output_offset  = oq_info.offset;
    const float output_scale   = oq_info.scale;
 
    int         output_multiplier = 0;
    int         output_shift      = 0;
    const float multiplier        = input_scale * weights_scale / output_scale;
    arm_compute::quantization::calculate_quantized_multiplier(multiplier, &output_multiplier, &output_shift);
 
    const int min = std::numeric_limits<T>::lowest();
    const int max = std::numeric_limits<T>::max();
#if defined(_OPENMP)
    #pragma omp parallel for
#endif /* _OPENMP */
    for(int y = 0; y < rows_weights; ++y)
    {
        // Reset accumulator
        int32_t acc = 0;
 
        for(int x = 0; x < cols_weights; ++x)
        {
            acc += (src_ptr[x] + input_offset) * (weights_ptr[x + y * cols_weights] + weights_offset);
        }
 
        // Accumulate the bias
        acc += bias_ptr[y];
 
        // Quantize down
        acc = quantize_down_scale_by_fixedpoint(acc, output_multiplier, output_shift, output_offset, min, max);
 
        // Store the result
        dst_ptr[y] = static_cast<T>(acc);
    }
}
} // namespace
 
template <typename T, typename TB>
SimpleTensor<T> fully_connected_layer(const SimpleTensor<T> &src, const SimpleTensor<T> &weights, const SimpleTensor<TB> &bias, const TensorShape &dst_shape, QuantizationInfo out_quant_info)
{
    // if no explicit quantization has been set you the same as src
    if(out_quant_info == QuantizationInfo())
    {
        out_quant_info = src.quantization_info();
    }
 
    // Create reference
    SimpleTensor<T> dst{ TensorShape{ dst_shape }, src.data_type(), 1, out_quant_info };
 
    // Health checks
    const int          num_batch_dimensions = std::max(0, static_cast<int>(dst_shape.num_dimensions()) - 1);
    const int          num_input_dimensions = src.shape().num_dimensions() - num_batch_dimensions;
    const unsigned int linear_input_size    = src.shape().total_size_lower(num_input_dimensions);
 
    ARM_COMPUTE_UNUSED(num_batch_dimensions);
    ARM_COMPUTE_UNUSED(num_input_dimensions);
    ARM_COMPUTE_UNUSED(linear_input_size);
    ARM_COMPUTE_ERROR_ON(weights.shape().x() != linear_input_size);
    ARM_COMPUTE_ERROR_ON(weights.shape().y() != bias.shape().x());
    ARM_COMPUTE_ERROR_ON(weights.shape().y() != dst.shape().x());
 
    // Compute reference
    const int cols_weights = weights.shape().x();
    const int rows_weights = weights.shape().y();
    const int num_batches  = dst_shape.total_size_upper(1);
 
    for(int k = 0; k < num_batches; ++k)
    {
        const int offset_in  = k * cols_weights;
        const int offset_out = k * rows_weights;
 
        vector_matrix_multiply<T>(src,
                                  weights,
                                  bias,
                                  dst,
                                  offset_in,
                                  offset_out,
                                  cols_weights,
                                  rows_weights);
    }
 
    return dst;
}
 
template SimpleTensor<float> fully_connected_layer(const SimpleTensor<float> &src, const SimpleTensor<float> &weights, const SimpleTensor<float> &bias, const TensorShape &dst_shape,
                                                   QuantizationInfo out_quant_info);
template SimpleTensor<half> fully_connected_layer(const SimpleTensor<half> &src, const SimpleTensor<half> &weights, const SimpleTensor<half> &bias, const TensorShape &dst_shape,
                                                  QuantizationInfo out_quant_info);
template SimpleTensor<uint8_t> fully_connected_layer(const SimpleTensor<uint8_t> &src, const SimpleTensor<uint8_t> &weights, const SimpleTensor<int32_t> &bias, const TensorShape &dst_shape,
                                                     QuantizationInfo out_quant_info);
template SimpleTensor<int8_t> fully_connected_layer(const SimpleTensor<int8_t> &src, const SimpleTensor<int8_t> &weights, const SimpleTensor<int32_t> &bias, const TensorShape &dst_shape,
                                                    QuantizationInfo out_quant_info);
} // namespace reference
} // namespace validation
} // namespace test
} // namespace arm_compute