[moco/ONNX] Introduce GraphBuilder and GraphBuilderRegistry (#3322)

This commit will introduce GraphBuilder for building graph
and GraphBuilderRegistry for registering each operation's graph building

Signed-off-by: Seok NamKoong <sk.namkoong@samsung.com>

diff --git a/contrib/moco/lib/frontend/onnx/src/GraphBuilder.h b/contrib/moco/lib/frontend/onnx/src/GraphBuilder.h
new file mode 100644 (file)
index 0000000..2c0c946
--- /dev/null
+++ b/contrib/moco/lib/frontend/onnx/src/GraphBuilder.h
@@ -0,0 +1,43 @@
+/*
+ * 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_FRONTEND_ONNX_GRAPH_BUILDER_H__
+#define __MOCO_FRONTEND_ONNX_GRAPH_BUILDER_H__
+
+#include "GraphBuilderContext.h"
+
+#include <onnx/onnx.pb.h>
+
+namespace moco
+{
+namespace onnx
+{
+
+/**
+* @brief Parent class of onnx operation graph builders
+*/
+class GraphBuilder
+{
+public:
+  virtual bool validate(const ::onnx::NodeProto &) const { return true; }
+  virtual void build(const ::onnx::NodeProto &, GraphBuilderContext *) const = 0;
+  virtual ~GraphBuilder() {}
+};
+
+} // namespace onnx
+} // namespace moco
+
+#endif // __MOCO_FRONTEND_ONNX_GRAPH_BUILDER_H__

diff --git a/contrib/moco/lib/frontend/onnx/src/GraphBuilderRegistry.h b/contrib/moco/lib/frontend/onnx/src/GraphBuilderRegistry.h
new file mode 100644 (file)
index 0000000..fa0fec7
--- /dev/null
+++ b/contrib/moco/lib/frontend/onnx/src/GraphBuilderRegistry.h
@@ -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.
+ */
+
+#ifndef __MOCO_FRONTEND_ONNX_GRAPH_BUILDER_REGISTRY_H__
+#define __MOCO_FRONTEND_ONNX_GRAPH_BUILDER_REGISTRY_H__
+
+#include "GraphBuilder.h"
+
+#include <map>
+
+namespace moco
+{
+namespace onnx
+{
+
+/**
+* @brief Class to return graph builder for passed onnx Operator
+*/
+class GraphBuilderRegistry
+{
+public:
+  /**
+  * @brief Returns registered GraphBuilder pointer for operator or
+  *        nullptr if not registered
+  */
+  const GraphBuilder *lookup(const std::string &op) const
+  {
+    if (_builder_map.find(op) == _builder_map.end())
+      return nullptr;
+
+    return _builder_map.at(op).get();
+  }
+
+  static GraphBuilderRegistry &get()
+  {
+    static GraphBuilderRegistry me;
+    return me;
+  }
+
+private:
+  GraphBuilderRegistry()
+  {
+    // TODO add operations
+  }
+
+private:
+  std::map<std::string, std::unique_ptr<GraphBuilder>> _builder_map;
+};
+
+} // namespace onnx
+} // namespace moco
+
+#endif // __MOCO_FRONTEND_ONNX_GRAPH_BUILDER_REGISTRY_H__