[moco-tf] Introduce ConcatV2Canonicalizer (#6360)

* [moco-tf] Introduce ConcatV2Canonicalizer

This will introduce ConcatV2Canonicalizer that converts TFConcatV2 to canonical TensorConcat node

Signed-off-by: SaeHie Park <saehie.park@samsung.com>
* fix typo

* remove unused header

diff --git a/compiler/moco-tf/src/Canonicalization/ConcatV2Canonicalizer.cpp b/compiler/moco-tf/src/Canonicalization/ConcatV2Canonicalizer.cpp
new file mode 100644 (file)
index 0000000..2100fe4
--- /dev/null
+++ b/compiler/moco-tf/src/Canonicalization/ConcatV2Canonicalizer.cpp
@@ -0,0 +1,98 @@
+/*
+ * 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 "ConcatV2Canonicalizer.h"
+
+#include "Dialect/TFDialect.h"
+#include "Dialect/TFNodes.h"
+#include "Dialect/TFNodeVisitor.h"
+#include "Dialect/TFNodeImpl.h"
+
+#include <stdex/Memory.h>
+
+namespace
+{
+
+bool canonicalize_concat(loco::Graph *graph, moco::tf::TFConcatV2 *node)
+{
+  /**
+   * @note This will replace TFConcatV2 node with Canonical TensorConcat
+   *
+   *       Before
+   *                 A --- TFConcatV2 -- C
+   *                 B --/
+   *       After
+   *                    +------ TFConcatV2 --
+   *                    |     /
+   *                 B -------
+   *                    |     \
+   *                 A -+------ TensorConcat -- C
+   *
+   *       Where
+   *                 A : lhs of TFConcatV2
+   *                 B : rhs of TFConcatV2
+   *                 C : a node that uses TFConcatV2 as an input
+   *                 TFConcatV2 is disconnected from C
+   */
+
+  auto tensorconcat_node = graph->nodes()->create<loco::TensorConcat>();
+
+  // copy attribute(s)
+  tensorconcat_node->axis(node->axis());
+
+  auto node_A = node->lhs();
+  auto node_B = node->rhs();
+
+  // update connections
+  tensorconcat_node->lhs(node_A);
+  tensorconcat_node->rhs(node_B);
+
+  // replace node
+  replace(node).with(tensorconcat_node);
+
+  return true;
+}
+
+} // namespace
+
+namespace moco
+{
+namespace tf
+{
+
+bool ConcatV2Canonicalizer::run(loco::Graph *graph)
+{
+  auto active_nodes = loco::active_nodes(loco::output_nodes(graph));
+  bool changed = false;
+
+  for (auto node : active_nodes)
+  {
+    if (node->dialect() == TFDialect::get())
+    {
+      auto tf_node = dynamic_cast<moco::tf::TFConcatV2 *>(node);
+      if (tf_node != nullptr)
+      {
+        if (canonicalize_concat(graph, tf_node))
+          changed = true;
+      }
+    }
+  }
+
+  return changed;
+}
+
+} // namespace tf
+} // namespace moco

diff --git a/compiler/moco-tf/src/Canonicalization/ConcatV2Canonicalizer.h b/compiler/moco-tf/src/Canonicalization/ConcatV2Canonicalizer.h
new file mode 100644 (file)
index 0000000..4448ddb
--- /dev/null
+++ b/compiler/moco-tf/src/Canonicalization/ConcatV2Canonicalizer.h
@@ -0,0 +1,44 @@
+/*
+ * 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.
+ */
+
+#ifndef __MOCO_TF_CONCATV2_CANONICALIZER_H__
+#define __MOCO_TF_CONCATV2_CANONICALIZER_H__
+
+#include "Transform.h"
+
+#include <loco.h>
+
+namespace moco
+{
+namespace tf
+{
+
+/**
+ * @brief  Convert TFConcatV2 to Canonical TensorConcat
+ */
+class ConcatV2Canonicalizer : public Transform
+{
+public:
+  const char *name(void) const final { return "ConcatV2Canonicalizer"; }
+
+public:
+  bool run(loco::Graph *graph) override;
+};
+
+} // namespace tf
+} // namespace moco
+
+#endif // __MOCO_TF_CONCATV2_CANONICALIZER_H__