IVGCVSW-2914 Add Switch Layer and no-op factory method

Change-Id: I6a6ece708a49e8a97c83a3e7fec11c88af1e1cfa
Signed-off-by: Sadik Armagan <sadik.armagan@arm.com>
Signed-off-by: Aron Virginas-Tar <Aron.Virginas-Tar@arm.com>

2 files changed, 102 insertions, 0 deletions

diff --git a/src/armnn/layers/SwitchLayer.cpp b/src/armnn/layers/SwitchLayer.cpp
new file mode 100644
index 0000000000..eae6e0dfe2
--- /dev/null
+++ b/src/armnn/layers/SwitchLayer.cpp
@@ -0,0 +1,60 @@
+//
+// Copyright © 2017 Arm Ltd. All rights reserved.
+// SPDX-License-Identifier: MIT
+//
+#include "SwitchLayer.hpp"
+
+#include "LayerCloneBase.hpp"
+
+#include <backendsCommon/WorkloadData.hpp>
+#include <backendsCommon/WorkloadFactory.hpp>
+
+namespace armnn
+{
+
+SwitchLayer::SwitchLayer(const char* name)
+    : Layer(2, 2, LayerType::Switch, name)
+{}
+
+std::unique_ptr<IWorkload> SwitchLayer::CreateWorkload(const Graph& graph,
+                                                       const IWorkloadFactory& factory) const
+{
+    SwitchQueueDescriptor descriptor;
+    return factory.CreateSwitch(descriptor, PrepInfoAndDesc(descriptor, graph));
+}
+
+SwitchLayer* SwitchLayer::Clone(Graph& graph) const
+{
+    return CloneBase<SwitchLayer>(graph, GetName());
+}
+
+void SwitchLayer::ValidateTensorShapesFromInputs()
+{
+    VerifyLayerConnections(2, CHECK_LOCATION());
+
+    BOOST_ASSERT_MSG(GetNumOutputSlots() == 2, "SwitchLayer: The layer should return 2 outputs.");
+
+    // Assuming first input is the Input and second input is the Constant
+    std::vector<TensorShape> inferredShapes = InferOutputShapes({
+        GetInputSlot(0).GetConnection()->GetTensorInfo().GetShape(),
+        GetInputSlot(1).GetConnection()->GetTensorInfo().GetShape() });
+
+    BOOST_ASSERT(inferredShapes.size() == 1);
+
+    ConditionalThrowIfNotEqual<LayerValidationException>(
+        "SwitchLayer: TensorShape set on OutputSlot[0] does not match the inferred shape.",
+        GetOutputSlot(0).GetTensorInfo().GetShape(),
+        inferredShapes[0]);
+
+    ConditionalThrowIfNotEqual<LayerValidationException>(
+        "SwitchLayer: TensorShape set on OutputSlot[0] does not match the inferred shape.",
+        GetOutputSlot(1).GetTensorInfo().GetShape(),
+        inferredShapes[0]);
+}
+
+void SwitchLayer::Accept(ILayerVisitor& visitor) const
+{
+    visitor.VisitSwitchLayer(this, GetName());
+}
+
+} // namespace armnn
diff --git a/src/armnn/layers/SwitchLayer.hpp b/src/armnn/layers/SwitchLayer.hpp
new file mode 100644
index 0000000000..bfda8c2b1b
--- /dev/null
+++ b/src/armnn/layers/SwitchLayer.hpp
@@ -0,0 +1,42 @@
+//
+// Copyright © 2017 Arm Ltd. All rights reserved.
+// SPDX-License-Identifier: MIT
+//
+#pragma once
+
+#include "Layer.hpp"
+
+namespace armnn
+{
+
+/// This layer calculates both true and false outputs for input.
+class SwitchLayer : public Layer
+{
+public:
+    /// Makes a workload for the Switch type.
+    /// @param [in] graph The graph where this layer can be found.
+    /// @param [in] factory The workload factory which will create the workload.
+    /// @return A pointer to the created workload, or nullptr if not created.
+    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.
+    SwitchLayer* Clone(Graph& graph) const override;
+
+    /// Check if the input tensor shape(s)
+    /// will lead to a valid configuration of @ref SwitchLayer.
+    void ValidateTensorShapesFromInputs() override;
+
+    void Accept(ILayerVisitor& visitor) const override;
+
+protected:
+    /// Constructor to create a SwitchLayer.
+    /// @param [in] name Optional name for the layer.
+    SwitchLayer(const char* name);
+
+    /// Default destructor
+    ~SwitchLayer() = default;
+};
+
+} // namespace armnn