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//
// Copyright © 2017 Arm Ltd. All rights reserved.
// SPDX-License-Identifier: MIT
//
#include "DataLayoutIndexed.hpp"
#include <boost/assert.hpp>
using namespace armnn;
namespace armnnUtils
{
DataLayoutIndexed::DataLayoutIndexed(armnn::DataLayout dataLayout)
: m_DataLayout(dataLayout)
{
switch (dataLayout)
{
case armnn::DataLayout::NHWC:
m_ChannelsIndex = 3;
m_HeightIndex = 1;
m_WidthIndex = 2;
break;
case armnn::DataLayout::NCHW:
m_ChannelsIndex = 1;
m_HeightIndex = 2;
m_WidthIndex = 3;
break;
default:
throw armnn::InvalidArgumentException("Unknown DataLayout value: " +
std::to_string(static_cast<int>(dataLayout)));
}
}
unsigned int DataLayoutIndexed::GetIndex(const TensorShape& shape,
unsigned int batchIndex, unsigned int channelIndex,
unsigned int heightIndex, unsigned int widthIndex) const
{
BOOST_ASSERT( batchIndex < shape[0] || ( shape[0] == 0 && batchIndex == 0 ) );
BOOST_ASSERT( channelIndex < shape[m_ChannelsIndex] ||
( shape[m_ChannelsIndex] == 0 && channelIndex == 0) );
BOOST_ASSERT( heightIndex < shape[m_HeightIndex] ||
( shape[m_HeightIndex] == 0 && heightIndex == 0) );
BOOST_ASSERT( widthIndex < shape[m_WidthIndex] ||
( shape[m_WidthIndex] == 0 && widthIndex == 0) );
// Offset the given indices appropriately depending on the data layout
switch (m_DataLayout)
{
case DataLayout::NHWC:
batchIndex *= shape[1] * shape[2] * shape[3]; // batchIndex *= heightIndex * widthIndex * channelIndex
heightIndex *= shape[m_WidthIndex] * shape[m_ChannelsIndex];
widthIndex *= shape[m_ChannelsIndex];
// channelIndex stays unchanged
break;
case DataLayout::NCHW:
default:
batchIndex *= shape[1] * shape[2] * shape[3]; // batchIndex *= heightIndex * widthIndex * channelIndex
channelIndex *= shape[m_HeightIndex] * shape[m_WidthIndex];
heightIndex *= shape[m_WidthIndex];
// widthIndex stays unchanged
break;
}
// Get the value using the correct offset
return batchIndex + channelIndex + heightIndex + widthIndex;
}
bool operator==(const DataLayout& dataLayout, const DataLayoutIndexed& indexed)
{
return dataLayout == indexed.GetDataLayout();
}
bool operator==(const DataLayoutIndexed& indexed, const DataLayout& dataLayout)
{
return indexed.GetDataLayout() == dataLayout;
}
} // namespace armnnUtils
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