1 // 2 // Copyright © 2017 Arm Ltd and Contributors. All rights reserved. 3 // SPDX-License-Identifier: MIT 4 // 5 #pragma once 6 7 #include <Layer.hpp> 8 9 namespace armnn 10 { 11 12 class ScopedCpuTensorHandle; 13 14 /// A layer that the constant data can be bound to. 15 class ConstantLayer : public Layer 16 { 17 public: 18 /// Makes a workload for the Constant type. 19 /// @param [in] graph The graph where this layer can be found. 20 /// @param [in] factory The workload factory which will create the workload. 21 /// @return A pointer to the created workload, or nullptr if not created. 22 virtual std::unique_ptr<IWorkload> CreateWorkload(const IWorkloadFactory& factory) const override; 23 24 /// Creates a dynamically-allocated copy of this layer. 25 /// @param [in] graph The graph into which this layer is being cloned. 26 ConstantLayer* Clone(Graph& graph) const override; 27 28 /// Check if the input tensor shape(s) 29 /// will lead to a valid configuration of @ref ConstantLayer 30 /// @param [in] shapeInferenceMethod Indicates if output shape shall be overwritten or just validated. 31 void ValidateTensorShapesFromInputs() override; 32 33 /// By default returns inputShapes if the number of inputs are equal to number of outputs, 34 /// otherwise infers the output shapes from given input shapes and layer properties. 35 /// @param [in] inputShapes The input shapes layer has. 36 /// @return a vector to the inferred output shape. 37 std::vector<TensorShape> InferOutputShapes(const std::vector<TensorShape>& inputShapes) const override; 38 39 /// Free up the constant source data stored by the layer. ReleaseConstantData()40 void ReleaseConstantData() override {} 41 42 void Accept(ILayerVisitor& visitor) const override; 43 44 std::unique_ptr<ScopedCpuTensorHandle> m_LayerOutput; 45 46 protected: 47 /// Constructor to create a ConstantLayer. 48 /// @param [in] name Optional name for the layer. 49 ConstantLayer(const char* name); 50 51 /// Default destructor 52 ~ConstantLayer() = default; 53 54 /// Retrieve the handles to the constant values stored by the layer. GetConstantTensorsByRef()55 ConstantTensors GetConstantTensorsByRef() override { return {m_LayerOutput}; } 56 }; 57 58 } // namespace 59