IVGCVSW-2458 Refactor the Optimize function (Network.cpp) so that

subgraphs are optimized by the backends

 * Added a new method OptimizeSubGraph to the backend interface
 * Refactored the Optimize function so that the backend-specific
   optimization is performed by the backend itself (through the new
   OptimizeSubGraph interface method)
 * Added a new ApplyBackendOptimizations function to apply the new
   changes
 * Added some new convenient constructors to the SubGraph class
 * Added AddLayer method and a pointer to the parent graph to the
   SubGraph class
 * Updated the sub-graph unit tests to match the changes
 * Added SelectSubGraphs and ReplaceSubGraphConnections overloads
   that work with sub-graphs
 * Removed unused code and minor refactoring where necessary

Change-Id: I46181794c6a9e3b10558944f804e06a8f693a6d0

1 files changed, 4 insertions, 0 deletions

diff --git a/src/backends/backendsCommon/IBackendInternal.hpp b/src/backends/backendsCommon/IBackendInternal.hpp
index 2e6b056798..6e6d47fc90 100644
--- a/src/backends/backendsCommon/IBackendInternal.hpp
+++ b/src/backends/backendsCommon/IBackendInternal.hpp
@@ -43,6 +43,8 @@ public:
 
     using ISubGraphConverterPtr = std::unique_ptr<ISubGraphConverter>;
 
+    using SubGraphUniquePtr = std::unique_ptr<SubGraph>;
+
     virtual IMemoryManagerUniquePtr CreateMemoryManager() const = 0;
 
     virtual IWorkloadFactoryPtr CreateWorkloadFactory(
@@ -54,6 +56,8 @@ public:
 
     virtual Optimizations GetOptimizations() const = 0;
     virtual ILayerSupportSharedPtr GetLayerSupport() const = 0;
+
+    virtual SubGraphUniquePtr OptimizeSubGraph(const SubGraph& subGraph, bool& optimizationAttempted) const = 0;
 };
 
 using IBackendInternalUniquePtr = std::unique_ptr<IBackendInternal>;