1 files changed, 66 insertions, 0 deletions
diff --git a/compiler/moco/pass/src/Passes/RemoveTFIdentityNode.cpp b/compiler/moco/pass/src/Passes/RemoveTFIdentityNode.cpp
new file mode 100644
index 000000000..d3d22c90e
--- /dev/null
+++ b/compiler/moco/pass/src/Passes/RemoveTFIdentityNode.cpp
@@ -0,0 +1,66 @@
+/*
+ * Copyright (c) 2019 Samsung Electronics Co., Ltd. All Rights Reserved
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "moco/Pass/Passes/RemoveTFIdentityNode.h"
+
+#include <moco/IR/TFDialect.h>
+#include <moco/IR/TFNode.h>
+
+#include <set>
+
+namespace moco
+{
+
+bool RemoveTFIdentityNode::run(loco::Graph *g)
+{
+  struct Collector final : public moco::TFNodeMutableVisitor<void>
+  {
+    void visit(moco::TFIdentity *node) final
+    {
+      if (node->input() != nullptr)
+      {
+        candidates.insert(node);
+      }
+    }
+
+    void visit(moco::TFNode *) final { return; }
+
+    std::set<moco::TFIdentity *> candidates;
+  };
+
+  Collector collector;
+
+  for (auto node : loco::all_nodes(g))
+  {
+    if (node->dialect() == moco::TFDialect::get())
+    {
+      auto tf_node = dynamic_cast<moco::TFNode *>(node);
+      // NOTE our analysis tool reports an error for tf_node may be nullptr
+      if (tf_node != nullptr)
+        tf_node->accept(&collector);
+    }
+  }
+
+  for (auto node : collector.candidates)
+  {
+    replace(node).with(node->input());
+    node->input(nullptr);
+  }
+
+  return collector.candidates.size() > 0;
+}
+
+} // namespace moco