IVGCVSW-3277 Refactor TensorHandle factory API

 * Added backend support for multiple types of TensorHandle factories
 * Refactored the backend API to enable new tensor strategies
 * Added mechanism to determine memory strategies during optimization
 * Perform mem-copy only when Direct access is not found
 * Explicitly deleted the copy-constructor from OutputSlot to prevent
   accidental local copies that would cause the DisconnectAll to be
   called by the destructor

Change-Id: I7e812c8e5e6c1c20db1c5932749ac70fd93db7f8
Signed-off-by: Derek Lamberti <derek.lamberti@arm.com>
Signed-off-by: Matteo Martincigh <matteo.martincigh@arm.com>

1 files changed, 24 insertions, 0 deletions

diff --git a/src/armnn/Network.hpp b/src/armnn/Network.hpp
index b90e3c2f8d..8db968a3f9 100644
--- a/src/armnn/Network.hpp
+++ b/src/armnn/Network.hpp
@@ -13,6 +13,7 @@
 
 #include <string>
 #include <vector>
+#include <map>
 #include <memory>
 
 #include "Layer.hpp"
@@ -229,4 +230,27 @@ private:
     std::unique_ptr<Graph> m_Graph;
 };
 
+
+
+struct OptimizationResult
+{
+    bool m_Warning;
+    bool m_Error;
+
+    OptimizationResult()
+        : m_Warning(false)
+        , m_Error(false)
+    {}
+};
+
+using BackendsMap = std::map<BackendId, std::unique_ptr<class IBackendInternal>>;
+
+BackendsMap CreateSupportedBackends(TensorHandleFactoryRegistry& handleFactoryRegistry,
+                                    struct BackendSettings& backendSettings);
+
+OptimizationResult SelectTensorHandleStrategy(Graph& optGraph,
+                                              BackendsMap& backends,
+                                              TensorHandleFactoryRegistry& registry,
+                                              Optional<std::vector<std::string>&> errMessages);
+
 } // namespace armnn