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//
// Copyright © 2017 Arm Ltd. All rights reserved.
// SPDX-License-Identifier: MIT
//
#pragma once
#include <armnn/Types.hpp>
#include <armnn/Tensor.hpp>
#include <boost/assert.hpp>
namespace armnnUtils
{
// Provides access to the appropriate indexes for Channels, Height and Width based on DataLayout
class DataLayoutIndexed
{
public:
DataLayoutIndexed(armnn::DataLayout dataLayout);
armnn::DataLayout GetDataLayout() const { return m_DataLayout; }
unsigned int GetChannelsIndex() const { return m_ChannelsIndex; }
unsigned int GetHeightIndex() const { return m_HeightIndex; }
unsigned int GetWidthIndex() const { return m_WidthIndex; }
inline unsigned int GetIndex(const armnn::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 armnn::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 armnn::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;
}
private:
armnn::DataLayout m_DataLayout;
unsigned int m_ChannelsIndex;
unsigned int m_HeightIndex;
unsigned int m_WidthIndex;
};
// Equality methods
bool operator==(const armnn::DataLayout& dataLayout, const DataLayoutIndexed& indexed);
bool operator==(const DataLayoutIndexed& indexed, const armnn::DataLayout& dataLayout);
} // namespace armnnUtils
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