libcaffeconverter import error for caffe to onnx

Question

Problem Description

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I'm following the caffe to onnx tutorial at https://github.com/onnx/onnx-docker/blob/master/onnx-ecosystem/converter_scripts/caffe_coreml_onnx.ipynb and I encounter this error: ImportError: cannot import name 'libcaffeconverter' from 'coremltools'

On further investigation, I realized that there is no libcaffeconverter in the coremltools directory.

System information

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OS Platform and Distribution: Windows 10 x64 ONNX version: 1.7.0 Python version: 3.7.7 Protobuf version: 3.13.0 Visual Studio version (if applicable): 2017 version 15.9.28307.1234

Reproduction instructions

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Create a NEW environment and run "pip install coremltools==4.0b3"

Run the code at https://github.com/onnx/onnx-docker/blob/master/onnx-ecosystem/converter_scripts/caffe_coreml_onnx.ipynb

OR

Run:

import coremltools coremltools.converters.caffe.convert(None)

Expected behavior

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I expected the code to create and save a an onnx file based on the caffe file specified in the code

Answer 1

TL;DR: switch to python 3.6

like the OP the problem was with import coremltools coremltools.converters.caffe.convert(None), producing `ImportError: cannot import name 'libcaffeconverter' This can be avoided by using a virtual environment with python 3.6

Workaround:

1. Create a python 3.6 environment with your package manager of choice in the terminal: conda create -n <your env name here> python=3.6 anaconda OR virtualenv --python=/usr/bin/python3.6

2. activate the virtual environment conda activate <your env name here> (or pip equivalent)

3. navigate to your project directory and run your file python <your script here>.py

now it should work as planned