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-rw-r--r--include/armnnUtils/DataLayoutIndexed.hpp72
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diff --git a/include/armnnUtils/DataLayoutIndexed.hpp b/include/armnnUtils/DataLayoutIndexed.hpp
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+//
+// Copyright © 2019 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