IVGCVSW-2508 Add no-op factory implementations and layer for Gather operator

 * Added GatherQueueDescriptor to WorkloadData
 * Added CreateGather function in WorkloadFactory.hpp
 * Added stub implementation of the CreateGreater function in workload factories
 * Added GatherLayer stub implementation
 * Added AddGatherLayer to Network
 * Added IsGatherSupported to LayerSupportBase

Change-Id: I0408fd54e88a7d4e3d9e1c2811a9323f0da52a04

1 files changed, 41 insertions, 0 deletions

diff --git a/src/armnn/layers/GatherLayer.hpp b/src/armnn/layers/GatherLayer.hpp
new file mode 100644
index 0000000000..7b3aebe77e
--- /dev/null
+++ b/src/armnn/layers/GatherLayer.hpp
@@ -0,0 +1,41 @@
+//
+// Copyright © 2017 Arm Ltd. All rights reserved.
+// SPDX-License-Identifier: MIT
+//
+
+#pragma once
+
+#include "Layer.hpp"
+
+namespace armnn
+{
+
+/// This layer represents a Gather operator.
+class GatherLayer : public Layer
+{
+public:
+    /// Makes a workload for the Gather 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.
+    GatherLayer* Clone(Graph& graph) const override;
+
+    /// Check if the input tensor shape(s)
+    /// will lead to a valid configuration of @ref GatherLayer.
+    void ValidateTensorShapesFromInputs() override;
+
+protected:
+    /// Constructor to create a GatherLayer.
+    /// @param [in] name Optional name for the layer.
+    GatherLayer(const char* name);
+
+    /// Default destructor
+    ~GatherLayer() = default;
+};
+
+} // namespace armnn