IVGCVSW-2509 Add GatherLayer implementation

 * implementation of ValidateTensorShapesFromInputs
 * unit tests

Change-Id: I1ed88f8ba0ea20329a259c5f36caea4b1fbeb013

1 files changed, 26 insertions, 0 deletions

diff --git a/src/armnn/layers/GatherLayer.cpp b/src/armnn/layers/GatherLayer.cpp
index 2e5d011599..d7ed4b2542 100644
--- a/src/armnn/layers/GatherLayer.cpp
+++ b/src/armnn/layers/GatherLayer.cpp
@@ -32,6 +32,32 @@ GatherLayer* GatherLayer::Clone(Graph& graph) const
 
 void GatherLayer::ValidateTensorShapesFromInputs()
 {
+    VerifyLayerConnections(2, CHECK_LOCATION());
+
+    const TensorInfo& params = GetInputSlot(0).GetConnection()->GetTensorInfo();
+    const TensorInfo& indices = GetInputSlot(1).GetConnection()->GetTensorInfo();
+
+    const unsigned int paramsDim = params.GetNumDimensions();
+    const unsigned int indicesDim = indices.GetNumDimensions();
+    const unsigned int outputDim = paramsDim - 1 + indicesDim;
+
+    std::vector<unsigned int> dimSizes;
+
+    for (unsigned int i = 0; i < indicesDim; ++i)
+    {
+        dimSizes.push_back(indices.GetShape()[i]);
+    }
+    for (unsigned int i = 1; i < paramsDim; ++i)
+    {
+        dimSizes.push_back(params.GetShape()[i]);
+    }
+
+    const TensorShape& inferredShape = TensorShape(outputDim, dimSizes.data());
+
+    ConditionalThrowIfNotEqual<LayerValidationException>(
+        "GatherLayer: TensorShape set on OutputSlot[0] does not match the inferred shape.",
+        GetOutputSlot(0).GetTensorInfo().GetShape(),
+        inferredShape);
 }
 
 } // namespace armnn