onnx.optimizer does not exist anymore

[londumas]

pytorch2keras/pytorch2keras/converter.py

Line 8 in 59bdb46

from onnx import optimizer

The code tries to import a library, onnx.optimizer, which no longer exists in latests onnx.
The imports work for onnx <1.9.0, does not work for >= 1.9.0.
A simple solution for now is to comment out the import

[metazool]

onnx/onnx#582 (comment) - the recommendation here is to downgrade the onnx dependency to 1.8.0... I'm curious if anyone's planning work to address this...

[jcwchen]

FYI: Actually onnxoptimizer is still available and ongoing from another repo: https://github.com/onnx/optimizer. It was moved out from ONNX package since ONNX 1.9.0. IIUC, you can still use it with the latest ONNX. Thanks!