| // |
| // Copyright © 2020 Arm Ltd. All rights reserved. |
| // SPDX-License-Identifier: MIT |
| // |
| #pragma once |
| |
| #include "Optimization.hpp" |
| |
| namespace armnn |
| { |
| namespace optimizations |
| { |
| |
| class TransposeAsReshapeImpl |
| { |
| public: |
| /// Run for every TransposeLayer. Replaces it with a ReshapeLayer if they are equivalent. |
| void Run(Graph& graph, TransposeLayer& transpose) const |
| { |
| if (IsReshape(transpose)) |
| { |
| const TensorInfo& outInfo = transpose.GetOutputHandler().GetTensorInfo(); |
| |
| const std::string name = std::string("as_reshape-") + transpose.GetName(); |
| const ReshapeDescriptor descriptor{outInfo.GetShape()}; |
| // Inserts NewLayer so layers don't need to be re-sorted. |
| auto reshape = graph.InsertNewLayer<ReshapeLayer>(transpose.GetInputSlot(0), descriptor, name.c_str()); |
| |
| // Bypass transpose. It will be deleted since it's left unconnected. |
| transpose.GetOutputSlot().MoveAllConnections(reshape->GetOutputSlot()); |
| } |
| } |
| |
| protected: |
| TransposeAsReshapeImpl() = default; |
| ~TransposeAsReshapeImpl() = default; |
| |
| private: |
| static bool IsReshape(const TransposeLayer& layer) |
| { |
| const TensorShape& outShape = layer.GetOutputHandler().GetTensorInfo().GetShape(); |
| const PermutationVector& permutation = layer.GetPermutation(); |
| |
| const unsigned int numDimensions = permutation.GetSize(); |
| std::map<unsigned int, unsigned int> permuteMappings; |
| for (unsigned int i = 0; i < permutation.GetSize(); ++i) |
| { |
| permuteMappings[permutation[i]] = i; |
| } |
| |
| std::vector<unsigned int> permuteVector; |
| for (unsigned int i = 0; i < permutation.GetSize(); ++i) |
| { |
| permuteVector.push_back(permuteMappings.at(i)); |
| } |
| |
| unsigned int lastGtOne = 0; |
| while ((lastGtOne < numDimensions) && (outShape[(permuteVector[lastGtOne])] == 1U)) |
| { |
| ++lastGtOne; |
| } |
| |
| bool isReshape = true; |
| for (unsigned int i = lastGtOne + 1U; isReshape && (i < numDimensions); ++i) |
| { |
| if (outShape[permuteVector[i]] > 1U) |
| { |
| isReshape = permuteVector[lastGtOne] < permuteVector[i]; |
| lastGtOne = i; |
| } |
| } |
| |
| return isReshape; |
| } |
| }; |
| |
| using TransposeAsReshape = OptimizeForType<TransposeLayer, TransposeAsReshapeImpl>; |
| |
| } // namespace optimizations |
| } // namespace armnn |