MLCE-510 Add CpuRef Shape Operator to ArmNN

 * Add front end
 * Add reference workload
 * Serialization/Deserialization
 * Add unit tests
 * Update ArmNN Versioning

Signed-off-by: Keith Davis <keith.davis@arm.com>
Change-Id: I6fcb1fa341d6f08dea4003b13544e6e9f53fefd3

2 files changed, 123 insertions, 0 deletions

diff --git a/src/armnn/layers/ShapeLayer.cpp b/src/armnn/layers/ShapeLayer.cpp
new file mode 100644
index 0000000000..4193fa9aab
--- /dev/null
+++ b/src/armnn/layers/ShapeLayer.cpp
@@ -0,0 +1,73 @@
+//
+// Copyright © 2021 Arm Ltd and Contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+//
+
+#include "ShapeLayer.hpp"
+
+#include "LayerCloneBase.hpp"
+
+#include <armnn/TypesUtils.hpp>
+#include <armnn/utility/NumericCast.hpp>
+
+#include <backendsCommon/WorkloadData.hpp>
+#include <backendsCommon/WorkloadFactory.hpp>
+
+namespace armnn
+{
+
+ShapeLayer::ShapeLayer(const char* name)
+    : Layer(1, 1, LayerType::Shape, name)
+{
+}
+
+std::unique_ptr<IWorkload> ShapeLayer::CreateWorkload(const IWorkloadFactory& factory) const
+{
+    ShapeQueueDescriptor descriptor;
+    SetAdditionalInfo(descriptor);
+
+    return factory.CreateShape(descriptor, PrepInfoAndDesc(descriptor));
+}
+
+ShapeLayer* ShapeLayer::Clone(Graph& graph) const
+{
+    return CloneBase<ShapeLayer>(graph, GetName());
+}
+
+void ShapeLayer::ValidateTensorShapesFromInputs()
+{
+    VerifyLayerConnections(1, CHECK_LOCATION());
+
+    const TensorShape& outputShape = GetOutputSlot(0).GetTensorInfo().GetShape();
+
+    VerifyShapeInferenceType(outputShape, m_ShapeInferenceMethod);
+
+    auto inferredShape = InferOutputShapes({ GetInputSlot(0).GetConnection()->GetTensorInfo().GetShape() });
+
+    ARMNN_ASSERT(inferredShape.size() == 1);
+
+    ValidateAndCopyShape(outputShape, inferredShape[0], m_ShapeInferenceMethod, "ShapeLayer");
+}
+
+std::vector<TensorShape> ShapeLayer::InferOutputShapes(const std::vector<TensorShape>& inputShapes) const
+{
+    IgnoreUnused(inputShapes);
+    ARMNN_ASSERT(inputShapes.size() == 1);
+
+    TensorShape outputShape({ inputShapes[0].GetNumDimensions()} );
+
+    return std::vector<TensorShape>({ outputShape });
+}
+
+void ShapeLayer::Accept(ILayerVisitor& visitor) const
+{
+    IgnoreUnused(visitor);
+    throw armnn::Exception("ShapeLayer VisitShapeLayer is not implemented");
+}
+
+void ShapeLayer::ExecuteStrategy(IStrategy& strategy) const
+{
+    strategy.ExecuteStrategy(this, BaseDescriptor(), {}, GetName());
+}
+
+} // namespace armnn
diff --git a/src/armnn/layers/ShapeLayer.hpp b/src/armnn/layers/ShapeLayer.hpp
new file mode 100644
index 0000000000..fee285c2f0
--- /dev/null
+++ b/src/armnn/layers/ShapeLayer.hpp
@@ -0,0 +1,50 @@
+//
+// Copyright © 2021 Arm Ltd and Contributors. All rights reserved.
+// SPDX-License-Identifier: MIT
+//
+
+#pragma once
+
+#include "LayerWithParameters.hpp"
+
+namespace armnn
+{
+
+class ShapeLayer : public Layer
+{
+public:
+    /// Makes a workload for the Shape 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 IWorkloadFactory& factory) const override;
+
+    /// Creates a dynamically-allocated copy of this layer.
+    /// @param [in] graph The graph into which this layer is being cloned.
+    ShapeLayer* Clone(Graph& graph) const override;
+
+    /// Check if the input tensor shape(s)
+    /// will lead to a valid configuration of @ref ShapeLayer.
+    /// @param [in] shapeInferenceMethod Indicates if output shape shall be overwritten or just validated.
+    void ValidateTensorShapesFromInputs() override;
+
+    /// By default returns inputShapes if the number of inputs are equal to number of outputs,
+    /// otherwise infers the output shapes from given input shapes and layer properties.
+    /// @param [in] inputShapes The input shapes layer has.
+    /// @return A vector to the inferred output shape.
+    std::vector<TensorShape> InferOutputShapes(const std::vector<TensorShape>& inputShapes) const override;
+
+    void Accept(ILayerVisitor& visitor) const override;
+
+    void ExecuteStrategy(IStrategy& strategy) const override;
+
+protected:
+    /// Constructor to create a ShapeLayer.
+    /// @param [in] name Optional name for the layer.
+    ShapeLayer(const char* name);
+
+    /// Default destructor.
+    ~ShapeLayer() = default;
+};
+
+} // namespace armnn