IVGCVSW-5314 Create OptimizeForExclusiveConnection

* FuseBatchNorm class has been added to facilitate testing
* Only Convolution2D FP32 being fused

Signed-off-by: Teresa Charlin <teresa.charlinreyes@arm.com>
Change-Id: I049c4770946ddca21b08516d4c9f4d0d22bf9b45

1 files changed, 56 insertions, 0 deletions

diff --git a/src/armnn/optimizations/Optimization.hpp b/src/armnn/optimizations/Optimization.hpp
index 1796ac842b..320cae2b75 100644
--- a/src/armnn/optimizations/Optimization.hpp
+++ b/src/armnn/optimizations/Optimization.hpp
@@ -122,4 +122,60 @@ public:
     using OptimizeForTypeImpl<BaseType, OptimizeForConnectionImpl<BaseType, ChildType, Wrapped>>::OptimizeForTypeImpl;
 };
 
+/// Wrapper Optimization class that calls Wrapped::Run for every connection BaseType -> ChildType.
+/// - Wrapped class mustn't remove the base layer. The optimizer will remove it if left unconnected
+///   after applying each optimization.
+/// - Wrapped class mustn't affect existing connections in the same output. It might add new ones.
+/// - Children layers are removed if left unconnected after applying the wrapped optimization.
+template <typename BaseType, typename ChildType, typename Wrapped>
+class OptimizeForExclusiveConnectionImpl : public Wrapped
+{
+public:
+    using Wrapped::Wrapped;
+
+    void Run(Graph& graph, BaseType& base) const
+    {
+        for (auto output = base.BeginOutputSlots(); output != base.EndOutputSlots(); ++output)
+        {
+            if (output->GetNumConnections() == 1)
+            {
+                for (auto&& childInput : output->GetConnections())
+                {
+                    if (childInput->GetOwningLayer().GetType() == LayerEnumOf<ChildType>())
+                    {
+                        Wrapped::Run(graph, *childInput);
+                    }
+                }
+
+                // Removes unconnected children.
+                for (unsigned int i = 0; i < output->GetNumConnections();)
+                {
+                    Layer* child = &output->GetConnection(i)->GetOwningLayer();
+
+                    if (child->IsOutputUnconnected())
+                    {
+                        graph.EraseLayer(child);
+                    }
+                    else
+                    {
+                        ++i;
+                    }
+                }
+            }
+        }
+    }
+
+protected:
+    ~OptimizeForExclusiveConnectionImpl() = default;
+};
+
+template <typename BaseType, typename ChildType, typename Wrapped>
+class OptimizeForExclusiveConnection final
+        : public OptimizeForTypeImpl<BaseType, OptimizeForExclusiveConnectionImpl<BaseType, ChildType, Wrapped>>
+{
+public:
+    using OptimizeForTypeImpl<BaseType,
+                              OptimizeForExclusiveConnectionImpl<BaseType, ChildType, Wrapped>>::OptimizeForTypeImpl;
+};
+
 } // namespace armnn