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//
// Copyright © 2019 Arm Ltd. All rights reserved.
// SPDX-License-Identifier: MIT
//
#include "InstanceNorm.hpp"
#include "RefWorkloadUtils.hpp"
#include <armnn/Tensor.hpp>
#include <DataLayoutIndexed.hpp>
#include <cmath>
namespace armnn
{
void InstanceNorm(const InstanceNormalizationQueueDescriptor& data,
Decoder<float>& inputDecoder,
Encoder<float>& outputEncoder)
{
const TensorInfo& inputInfo = GetTensorInfo(data.m_Inputs[0]);
const TensorShape inputShape = inputInfo.GetShape();
armnnUtils::DataLayoutIndexed dataLayout(data.m_Parameters.m_DataLayout);
unsigned int inputBatches = inputShape[0];
unsigned int inputHeight = inputShape[dataLayout.GetHeightIndex()];
unsigned int inputWidth = inputShape[dataLayout.GetWidthIndex()];
unsigned int inputChannels = inputShape[dataLayout.GetChannelsIndex()];
float beta = data.m_Parameters.m_Beta;
float eps = data.m_Parameters.m_Eps;
float gamma = data.m_Parameters.m_Gamma;
for (unsigned int n = 0; n < inputBatches; ++n)
{
for (unsigned int c = 0; c < inputChannels; ++c)
{
float mean = 0, var = 0;
//Calculate Mean
for (unsigned int h = 0; h < inputHeight; h++)
{
for (unsigned int w = 0; w < inputWidth; w++)
{
unsigned int index = dataLayout.GetIndex(inputShape, n, c, h, w);
inputDecoder[index];
float value = inputDecoder.Get();
mean += value;
}
}
mean /= static_cast<float>(inputHeight * inputWidth);
//Calculate Variance
for (unsigned int h = 0; h < inputHeight; h++)
{
for (unsigned int w = 0; w < inputWidth; w++)
{
unsigned int index = dataLayout.GetIndex(inputShape, n, c, h, w);
inputDecoder[index];
float value = inputDecoder.Get();
var += (value - mean) * (value - mean);
}
}
var /= static_cast<float>(inputHeight * inputWidth);
// Apply Instance Normalisation
for (unsigned int h = 0; h < inputHeight; ++h)
{
for (unsigned int w = 0; w < inputWidth; ++w)
{
unsigned int index = dataLayout.GetIndex(inputShape, n, c, h, w);
inputDecoder[index];
outputEncoder[index];
outputEncoder.Set((inputDecoder.Get() - mean) * gamma / std::sqrt ( var + eps) + beta);
}
}
}
}
}
} // namespace armnn
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