IVGCVSW-2915 Add Merge Layer and no-op factory method

Change-Id: I54549671e0d3b207904cf9796a843eb2b0a631f7
Signed-off-by: Nattapat Chaimanowong <nattapat.chaimanowong@arm.com>

5 files changed, 28 insertions, 1 deletions

diff --git a/include/armnn/ILayerSupport.hpp b/include/armnn/ILayerSupport.hpp
index fe440719b0..1b75810aca 100644
--- a/include/armnn/ILayerSupport.hpp
+++ b/include/armnn/ILayerSupport.hpp
@@ -171,6 +171,11 @@ public:
                                     const TensorInfo& output,
                                     Optional<std::string&> reasonIfUnsupported = EmptyOptional()) const = 0;
 
+    virtual bool IsMergeSupported(const TensorInfo& input0,
+                                  const TensorInfo& input1,
+                                  const TensorInfo& output,
+                                  Optional<std::string&> reasonIfUnsupported = EmptyOptional()) const = 0;
+
     virtual bool IsMergerSupported(const std::vector<const TensorInfo*> inputs,
                                    const TensorInfo& output,
                                    const OriginsDescriptor& descriptor,
diff --git a/include/armnn/ILayerVisitor.hpp b/include/armnn/ILayerVisitor.hpp
index e23cf5e6dd..3a4c39b7c6 100644
--- a/include/armnn/ILayerVisitor.hpp
+++ b/include/armnn/ILayerVisitor.hpp
@@ -199,6 +199,12 @@ public:
                                 const MeanDescriptor& meanDescriptor,
                                 const char* name = nullptr) = 0;
 
+    /// Function that a merge layer should call back to when its Accept(ILayerVisitor&) function is invoked.
+    /// @param layer - pointer to the layer which is calling back to this visit function.
+    /// @param name - Optional name for the layer.
+    virtual void VisitMergeLayer(const IConnectableLayer* layer,
+                                 const char* name = nullptr) = 0;
+
     /// Function that a merger layer should call back to when its Accept(ILayerVisitor&) function is invoked.
     /// @param layer - pointer to the layer which is calling back to this visit function.
     /// @param mergerDescriptor - WindowsDescriptor to configure the merging process. Number of Views must be equal to
@@ -337,4 +343,4 @@ public:
 
 
 };
-} // namespace armnn
\ No newline at end of file
+} // namespace armnn
diff --git a/include/armnn/INetwork.hpp b/include/armnn/INetwork.hpp
index 5a9d4f246e..8243b39c36 100644
--- a/include/armnn/INetwork.hpp
+++ b/include/armnn/INetwork.hpp
@@ -235,6 +235,11 @@ public:
     virtual IConnectableLayer* AddSplitterLayer(const ViewsDescriptor& splitterDescriptor
         , const char* name = nullptr) = 0;
 
+    /// Adds a merge layer to the network.
+    /// @param name - Optional name for the layer.
+    /// @return - Interface for configuring the layer.
+    virtual IConnectableLayer* AddMergeLayer(const char* name = nullptr) = 0;
+
     /// Adds a merger layer to the network.
     /// @param mergerDescriptor - WindowsDescriptor to configure the merging process. Number of Views must be equal to
     ///                           the number of inputs, and their order must match - e.g. first view corresponds to
diff --git a/include/armnn/LayerSupport.hpp b/include/armnn/LayerSupport.hpp
index 7c6bc1372a..e23fdd0a75 100644
--- a/include/armnn/LayerSupport.hpp
+++ b/include/armnn/LayerSupport.hpp
@@ -204,6 +204,14 @@ bool IsMemCopySupported(const BackendId& backend,
                         size_t reasonIfUnsupportedMaxLength = 1024);
 
 /// Deprecated in favor of IBackend and ILayerSupport interfaces
+bool IsMergeSupported(const BackendId& backend,
+                      const TensorInfo& input0,
+                      const TensorInfo& input1,
+                      const TensorInfo& output,
+                      char* reasonIfUnsupported = nullptr,
+                      size_t reasonIfUnsupportedMaxLength = 1024);
+
+/// Deprecated in favor of IBackend and ILayerSupport interfaces
 bool IsMergerSupported(const BackendId& backend,
                        const std::vector<const TensorInfo*> inputs,
                        const TensorInfo& output,
diff --git a/include/armnn/LayerVisitorBase.hpp b/include/armnn/LayerVisitorBase.hpp
index a5459e1a32..f4e0f438be 100644
--- a/include/armnn/LayerVisitorBase.hpp
+++ b/include/armnn/LayerVisitorBase.hpp
@@ -87,6 +87,9 @@ public:
                             const ViewsDescriptor&,
                             const char*) override { DefaultPolicy::Apply(); }
 
+    void VisitMergeLayer(const IConnectableLayer*,
+                         const char*) override { DefaultPolicy::Apply(); }
+
     void VisitMergerLayer(const IConnectableLayer*,
                           const OriginsDescriptor&,
                           const char*) override { DefaultPolicy::Apply(); }