[tools/onnx-subgraph] add onnx proto wrapper for graph parsing

tools/onnx_subgraph/CMakeLists.txt

@@ -11,11 +11,21 @@ find_package(Protobuf REQUIRED)
 find_package(jsoncpp REQUIRED)
 find_package(Python3 COMPONENTS Interpreter Development REQUIRED)
 
+set(PROTO_FILES onnx.proto)
+protobuf_generate_cpp(PROTO_SRCS PROTO_HDRS ${PROTO_FILES})
+
 include_directories(${CMAKE_CURRENT_BINARY_DIR})
+include_directories(${CMAKE_CURRENT_SOURCE_DIR}/include)
 include_directories(${Python3_INCLUDE_DIRS})
 
+file(GLOB SOURCES "src/lib/*.cpp" )
+
+add_library(onnx-subgraph-parser STATIC ${SOURCES} ${PROTO_SRCS} ${PROTO_FILES})
+target_link_libraries(onnx-subgraph-parser protobuf jsoncpp)
+
 add_executable(onnx-subgraph src/main.cpp)
-target_link_libraries(onnx-subgraph ${Python3_LIBRARIES})
+target_link_libraries(onnx-subgraph onnx-subgraph-parser)
+target_link_libraries(onnx-subgraph  ${Python3_LIBRARIES})
 
 set(ONNX_SUBGRAPH_FILES                                                 
     test_model_download.sh

tools/onnx_subgraph/include/graph.h

@@ -0,0 +1,90 @@
+/*
+ * Copyright (c) 2025 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 GRAPH_H
+#define GRAPH_H
+
+#include "onnx.pb.h"
+
+#include <iostream>
+#include <fstream>
+#include <unordered_map>
+#include <functional>
+#include <filesystem>
+
+// save the size of each node's inputs and outputs
+struct NodeIOSize
+{
+  std::vector<std::vector<int64_t>> inputSizes;
+  std::vector<std::vector<int64_t>> outputSizes;
+};
+
+struct GraphAdjacencyNode
+{
+  std::vector<int> outputNodeIndex;
+  int rank;
+  std::string name;
+  int index;
+};
+
+struct NodeTensor
+{
+  std::string name;
+  std::vector<int64_t> shape;
+
+  // Default constructor
+  NodeTensor() = default;
+
+  // Constructor with parameters
+  NodeTensor(const std::string &n, const std::vector<int64_t> &s) : name(n), shape(s) {}
+
+  // Equality comparison operator
+  bool operator==(const NodeTensor &other) const
+  {
+    return name == other.name && shape == other.shape;
+  }
+};
+
+namespace std
+{
+
+template <> struct hash<NodeTensor>
+{
+  size_t operator()(const NodeTensor &tensor) const
+  {
+    size_t hashValue = hash<string>()(tensor.name);
+    for (auto &val : tensor.shape)
+    {
+      hashValue ^= hash<int64_t>()(val) + 0x9e3779b9 + (hashValue << 6) + (hashValue >> 2);
+    }
+    return hashValue;
+  }
+};
+
+} // namespace std
+
+/**
+ * @brief     Loads an ONNX model from a file and returns the graph contained within.
+ *
+ * @param     [in] path The file path to the ONNX model.
+ * @pre       The file specified by path should exist and be a valid ONNX model.
+ * @post      The ONNX model is parsed and its graph is returned.
+ * @exception Exits the program with an error message if the file cannot be opened.
+ * @return    The ONNX GraphProto object representing the graph from the model.
+ */
+onnx::GraphProto GetGraphFromOnnx(std::string &path);
+
+#endif // GRAPH_H