onnx error:

import onnx



Traceback (most recent call last):
  File "torch2onnx.py", line 3, in 
    import onnx
  File "/home/dy/anaconda3/envs/torch/lib/python3.6/site-packages/onnx/__init__.py", line 5, in 
    from .onnx_cpp2py_export import ONNX_ML
ImportError: /home/dy/anaconda3/envs/torch/lib/python3.6/site-packages/onnx/onnx_cpp2py_export.cpython-36m-x86_64-linux-gnu.so: undefined symbol: _ZN6google8protobuf7Message17CopyWithSizeCheckEPS1_RKS1_

Solution:

git clone https://github.com/onnx/onnx.git

cd onnx

git submodule update –init –recursive

# Optional: prefer lite proto

export CMAKE_ARGS=”-DONNX_USE_PROTOBUF_SHARED_LIBS=ON”

export CMAKE_ARGS=-DONNX_USE_LITE_PROTO=ON

pip install -e .

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