onnx operator adaptor, or optimizer
mkdir build
cd budild/
cmake ..
make -j
cd ..
g++ main.cpp build/libonnx.a build/libonnx_proto.a /usr/local/lib/libprotobuf.a -std=c++11 -pthread -I/usr/local/include -I./onnx/ -o onnx_adaptor
./bin/onnx_adaptor [input_onnx_model] [output_onnx_model]