[moco-tf] Canonicalizer for TFStopGradient (#6731)

This will introduce Canonicalizer for TFStopGradient that converts to Canonical Forward node

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

diff --git a/compiler/moco-tf/src/Canonicalization/StopGradientCanonicalizer.cpp b/compiler/moco-tf/src/Canonicalization/StopGradientCanonicalizer.cpp
new file mode 100644 (file)
index 0000000..a52af05
--- /dev/null
+++ b/compiler/moco-tf/src/Canonicalization/StopGradientCanonicalizer.cpp
@@ -0,0 +1,90 @@
+/*
+ * 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 "StopGradientCanonicalizer.h"
+
+#include "Dialect/TFDialect.h"
+#include "Dialect/TFNodes.h"
+#include "Dialect/TFNodeVisitor.h"
+#include "Dialect/TFNodeImpl.h"
+
+#include <moco/Log.h>
+
+namespace
+{
+
+bool canonicalize_stopgradient(loco::Graph *graph, moco::tf::TFStopGradient *node)
+{
+  LOGGER(l);
+
+  INFO(l) << "TFNodeCanonicalize TFStopGradient begin";
+
+  /**
+  * This will replace shape inferred TFStopGradient node into canonical Forward
+  *
+  * Before
+  *           In --- TFStopGradient --- Out(s)
+  *
+  * After
+  *               -- TFStopGradient
+  *              /
+  *           In --- Forward --- Out(s)
+  */
+
+  // Create loco node to replace
+  auto forward_node = graph->nodes()->create<loco::Forward>();
+
+  // update connection
+  forward_node->input(node->input());
+
+  // replace node
+  replace(node).with(forward_node);
+
+  INFO(l) << "TFNodeCanonicalize TFStopGradient done";
+
+  return true;
+}
+
+} // namespace
+
+namespace moco
+{
+namespace tf
+{
+
+bool StopGradientCanonicalizer::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_stopgradient = dynamic_cast<moco::tf::TFStopGradient *>(node);
+      if (tf_stopgradient != nullptr)
+      {
+        if (canonicalize_stopgradient(graph, tf_stopgradient))
+          changed = true;
+      }
+    }
+  }
+
+  return changed;
+}
+
+} // namespace tf
+} // namespace moco

diff --git a/compiler/moco-tf/src/Canonicalization/StopGradientCanonicalizer.h b/compiler/moco-tf/src/Canonicalization/StopGradientCanonicalizer.h
new file mode 100644 (file)
index 0000000..a23a801
--- /dev/null
+++ b/compiler/moco-tf/src/Canonicalization/StopGradientCanonicalizer.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_STOPGRADIENT_CANONICALIZER_H__
+#define __MOCO_TF_STOPGRADIENT_CANONICALIZER_H__
+
+#include "Transform.h"
+
+#include <loco.h>
+
+namespace moco
+{
+namespace tf
+{
+
+/**
+* @brief Canonicalize TF-dialect TFStopGradient into canonical Forward node
+*/
+class StopGradientCanonicalizer : public Transform
+{
+public:
+  const char *name(void) const final { return "StopGradientCanonicalizer"; }
+
+public:
+  bool run(loco::Graph *graph) override;
+};
+
+} // namespace tf
+} // namespace moco
+
+#endif // __MOCO_TF_STOPGRADIENT_CANONICALIZER_H__