import error

[haofanwang]

When I run

import onnx
import onnx_caffe2.backend

I got

[libprotobuf FATAL google/protobuf/stubs/common.cc:61] This program requires version 3.4.0 of the Protocol Buffer runtime library, but the installed version is 2.6.1.  Please update your library.  If you compiled the program yourself, make sure that your headers are from the same version of Protocol Buffers as your link-time library.  (Version verification failed in "google/protobuf/any.pb.cc".)
terminate called after throwing an instance of 'google::protobuf::FatalException'
  what():  This program requires version 3.4.0 of the Protocol Buffer runtime library, but the installed version is 2.6.1.  Please update your library.  If you compiled the program yourself, make sure that your headers are from the same version of Protocol Buffers as your link-time library.  (Version verification failed in "google/protobuf/any.pb.cc".)
Aborted (core dumped)`

However,when I check,

$ protoc --version
libprotoc 3.4.0

Besides,I can run import torch.onnx and import onnx_caffe2.backend independently,but cannot run together. Note that I have successfully installed caffe2 as instruction.

Anyone can help with it?

[houseroad]

Looks like you have two different version of protobuf, 3.4.0 and 2.6.1. Try to only keep one protobuf. Build caffe2 from scratch again.