IVGCVSW-2353 Ignore control inputs in TensorFlow parser

 * Allow control inputs from TensorFlow graph but ignore them in ArmNN graph.
 * Add utility function to test ArmNN graph structure.
 * Add ArmNN graph structure tests in TensorFlow paresr to ensure that control inputs
   are ignored in ArmNN graph as well as their inputs that are not used anywhere else.

Change-Id: Ib0ea0d2df85e3fc79b748fa4c9d20e0649352bc1

3 files changed, 76 insertions, 27 deletions

diff --git a/src/armnn/test/GraphTests.cpp b/src/armnn/test/GraphTests.cpp
index 0c0ba8b000..cca4653509 100644
--- a/src/armnn/test/GraphTests.cpp
+++ b/src/armnn/test/GraphTests.cpp
@@ -29,18 +29,6 @@ bool CheckOrder(const armnn::Graph& graph, const armnn::Layer* first, const armn
     return (secondPos != order.end());
 }
 
-static armnn::Layer* GetFirstLayerWithName(armnn::Graph& graph, const std::string& name)
-{
-    for (auto&& layer : graph)
-    {
-        if (layer->GetNameStr() == name)
-        {
-            return layer;
-        }
-    }
-    return nullptr;
-}
-
 BOOST_AUTO_TEST_SUITE(Graph)
 
 BOOST_AUTO_TEST_CASE(ClassGraph)
diff --git a/src/armnn/test/GraphUtils.cpp b/src/armnn/test/GraphUtils.cpp
new file mode 100644
index 0000000000..1f9bb44d3d
--- /dev/null
+++ b/src/armnn/test/GraphUtils.cpp
@@ -0,0 +1,63 @@
+//
+// Copyright © 2017 Arm Ltd. All rights reserved.
+// SPDX-License-Identifier: MIT
+//
+
+#include "GraphUtils.hpp"
+
+bool GraphHasNamedLayer(const armnn::Graph& graph, const std::string& name)
+{
+    for (auto&& layer : graph)
+    {
+        if (layer->GetName() == name)
+        {
+            return true;
+        }
+    }
+    return false;
+}
+
+armnn::Layer* GetFirstLayerWithName(armnn::Graph& graph, const std::string& name)
+{
+    for (auto&& layer : graph)
+    {
+        if (layer->GetNameStr() == name)
+        {
+            return layer;
+        }
+    }
+    return nullptr;
+}
+
+bool CheckNumberOfInputSlot(armnn::Layer* layer, unsigned int num)
+{
+    return layer->GetNumInputSlots() == num;
+}
+
+bool CheckNumberOfOutputSlot(armnn::Layer* layer, unsigned int num)
+{
+    return layer->GetNumOutputSlots() == num;
+}
+
+bool IsConnected(armnn::Layer* srcLayer, armnn::Layer* destLayer,
+                 unsigned int srcSlot, unsigned int destSlot,
+                 const armnn::TensorInfo& expectedTensorInfo)
+{
+    const armnn::IOutputSlot& outputSlot = srcLayer->GetOutputSlot(srcSlot);
+    const armnn::TensorInfo& tensorInfo = outputSlot.GetTensorInfo();
+    if (expectedTensorInfo != tensorInfo)
+    {
+        return false;
+    }
+    const unsigned int numConnections = outputSlot.GetNumConnections();
+    for (unsigned int c = 0; c < numConnections; ++c)
+    {
+        auto inputSlot = boost::polymorphic_downcast<const armnn::InputSlot*>(outputSlot.GetConnection(c));
+        if (inputSlot->GetOwningLayer().GetNameStr() == destLayer->GetNameStr() &&
+            inputSlot->GetSlotIndex() == destSlot)
+        {
+            return true;
+        }
+    }
+    return false;
+}
diff --git a/src/armnn/test/GraphUtils.hpp b/src/armnn/test/GraphUtils.hpp
index 04f9727dc0..b51e4d179e 100644
--- a/src/armnn/test/GraphUtils.hpp
+++ b/src/armnn/test/GraphUtils.hpp
@@ -8,18 +8,16 @@
 
 #include <string>
 
-namespace
-{
-
-bool GraphHasNamedLayer(const armnn::Graph& graph, const std::string& name)
-{
-    for (auto&& layer : graph)
-    {
-        if (layer->GetName() == name)
-        {
-            return true;
-        }
-    }
-    return false;
-}
-}
\ No newline at end of file
+
+bool GraphHasNamedLayer(const armnn::Graph& graph, const std::string& name);
+
+armnn::Layer* GetFirstLayerWithName(armnn::Graph& graph, const std::string& name);
+
+bool CheckNumberOfInputSlot(armnn::Layer* layer, unsigned int num);
+
+bool CheckNumberOfOutputSlot(armnn::Layer* layer, unsigned int num);
+
+bool IsConnected(armnn::Layer* srcLayer, armnn::Layer* destLayer,
+                 unsigned int srcSlot, unsigned int destSlot,
+                 const armnn::TensorInfo& expectedTensorInfo);
+