IVGCVSW-4009 StandInLayer frontend API

Change-Id: I058c57b554769799c6775813215070ef47790e3d
Signed-off-by: Derek Lamberti <derek.lamberti@arm.com>

2 files changed, 103 insertions, 0 deletions

diff --git a/src/armnn/layers/StandInLayer.cpp b/src/armnn/layers/StandInLayer.cpp
new file mode 100644
index 0000000000..fdc905fea2
--- /dev/null
+++ b/src/armnn/layers/StandInLayer.cpp
@@ -0,0 +1,47 @@
+//
+// Copyright © 2019 Arm Ltd. All rights reserved.
+// SPDX-License-Identifier: MIT
+//
+
+#include "StandInLayer.hpp"
+#include "LayerCloneBase.hpp"
+
+namespace armnn
+{
+
+StandInLayer::StandInLayer(const StandInDescriptor& param, const char* name)
+    : LayerWithParameters(param.m_NumInputs, 1, LayerType::StandIn, param, name)
+{
+}
+
+std::unique_ptr<IWorkload> StandInLayer::CreateWorkload(const Graph& graph, const IWorkloadFactory& factory) const
+{
+    // This throws in the event that it's called. We would expect that any backend that
+    // "claims" to support the StandInLayer type would actually substitute it with a PrecompiledLayer
+    // during graph optimization. There is no interface on the IWorkloadFactory to create a StandInWorkload.
+    throw Exception("Stand in layer does not support creating workloads");
+}
+
+StandInLayer* StandInLayer::Clone(Graph& graph) const
+{
+    return CloneBase<StandInLayer>(graph, m_Param, GetName());
+}
+
+std::vector<TensorShape> StandInLayer::InferOutputShapes(const std::vector<TensorShape>& inputShapes) const
+{
+    throw Exception("Stand in layer does not support infering output shapes");
+}
+
+void StandInLayer::ValidateTensorShapesFromInputs()
+{
+    // Cannot validate this layer since no implementation details can be known by the framework
+    // so do nothing here.
+}
+
+void StandInLayer::Accept(ILayerVisitor& visitor) const
+{
+    visitor.VisitStandInLayer(this, GetParameters(), GetName());
+}
+} //namespace armnn
+
+
diff --git a/src/armnn/layers/StandInLayer.hpp b/src/armnn/layers/StandInLayer.hpp
new file mode 100644
index 0000000000..9fe1773a27
--- /dev/null
+++ b/src/armnn/layers/StandInLayer.hpp
@@ -0,0 +1,56 @@
+//
+// Copyright © 2019 Arm Ltd. All rights reserved.
+// SPDX-License-Identifier: MIT
+//
+
+#pragma once
+
+#include "LayerWithParameters.hpp"
+
+namespace armnn
+{
+
+/// This layer represents an unknown operation in the input graph.
+class StandInLayer : public LayerWithParameters<StandInDescriptor>
+{
+public:
+    /// Empty implementation explictly does NOT create a workload. Throws Exception if called.
+    /// @param [in] graph The graph where this layer can be found.
+    /// @param [in] factory The workload factory which will create the workload.
+    /// @return Does not return anything. Throws Exception if called.
+    virtual std::unique_ptr<IWorkload>CreateWorkload(const Graph& graph,
+                                                     const IWorkloadFactory& factory) const override;
+
+    /// Creates a dynamically-allocated copy of this layer.
+    /// @param [in] graph The graph into which this layer is being cloned.
+    StandInLayer* Clone(Graph& graph) const override;
+
+    /// Check if the input tensor shape(s)
+    /// Does nothing since cannot validate any properties of this layer.
+    void ValidateTensorShapesFromInputs() override;
+
+    /// Empty implementation that throws Exception if called.
+    /// otherwise infers the output shapes from given input shapes and layer properties.
+    /// @param [in] inputShapes The input shapes layer has.
+    /// @return Does not return anything. Throws Exception if called.
+    std::vector<TensorShape> InferOutputShapes(const std::vector<TensorShape>& inputShapes) const override;
+
+    /// Accepts a visitor object and calls VisitStandInLayer() method.
+    /// @param visitor The visitor on which to call VisitStandInLayer() method.
+    void Accept(ILayerVisitor& visitor) const override;
+
+protected:
+    /// Constructor to create a StandInLayer.
+    /// @param [in] param StandInDescriptor to configure the stand-in operation.
+    /// @param [in] name Optional name for the layer.
+    StandInLayer(const StandInDescriptor& param, const char* name);
+
+    /// Default destructor
+    ~StandInLayer() = default;
+};
+
+} //namespace armnn
+
+
+
+