IVGCVSW-2371 Add Rsqrt Ref implementation

*Added Unit Tests

Change-Id: I6cceb8e6dcda35ce08415f8e5ca86019a64d26e3

1 files changed, 48 insertions, 0 deletions

diff --git a/src/armnn/layers/RsqrtLayer.cpp b/src/armnn/layers/RsqrtLayer.cpp
new file mode 100644
index 0000000000..d516810c68
--- /dev/null
+++ b/src/armnn/layers/RsqrtLayer.cpp
@@ -0,0 +1,48 @@
+//
+// Copyright © 2017 Arm Ltd. All rights reserved.
+// SPDX-License-Identifier: MIT
+//
+
+#include "RsqrtLayer.hpp"
+
+#include "LayerCloneBase.hpp"
+
+#include <armnn/TypesUtils.hpp>
+#include <backendsCommon/WorkloadData.hpp>
+#include <backendsCommon/WorkloadFactory.hpp>
+
+namespace armnn
+{
+
+RsqrtLayer::RsqrtLayer(const char* name)
+    : Layer(1, 1, LayerType::Rsqrt, name)
+{
+}
+
+std::unique_ptr<IWorkload> RsqrtLayer::CreateWorkload(const Graph& graph,
+                                                      const IWorkloadFactory& factory) const
+{
+    RsqrtQueueDescriptor descriptor;
+    return factory.CreateRsqrt(descriptor, PrepInfoAndDesc(descriptor, graph));
+}
+
+RsqrtLayer* RsqrtLayer::Clone(Graph& graph) const
+{
+    return CloneBase<RsqrtLayer>(graph, GetName());
+}
+
+void RsqrtLayer::ValidateTensorShapesFromInputs()
+{
+    VerifyLayerConnections(1, CHECK_LOCATION());
+
+    auto inferredShapes = InferOutputShapes({ GetInputSlot(0).GetConnection()->GetTensorInfo().GetShape() });
+
+    BOOST_ASSERT(inferredShapes.size() == 1);
+
+    ConditionalThrowIfNotEqual<LayerValidationException>(
+            "RsqrtLayer: TensorShape set on OutputSlot[0] does not match the inferred shape.",
+            GetOutputSlot(0).GetTensorInfo().GetShape(),
+            inferredShapes[0]);
+}
+
+} // namespace armnn
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