cannot import name 'FEATURE_IMPORTANCE_TYPE_MAPPER' from 'lightgbm.basic'

[nitish20899]

This issue arises while attempting to utilize onnxmltools.convert.convert_lightgbm. It invokes the method at /opt/conda/lib/python3.8/site-packages/onnxmltools/convert/lightgbm/operator_converters/LightGbm.py:267, specifically within dump_booster_model(self, num_iteration, start_iteration, importance_type, verbose). Here is the snippet related to the issue:

265 if getattr(self, 'is_mock', False):
266     return self.dump_model(), None
--> 267 from lightgbm.basic import (
268     _LIB, FEATURE_IMPORTANCE_TYPE_MAPPER, _safe_call,

The problem stems from the fact that it is attempting to call FEATURE_IMPORTANCE_TYPE_MAPPER, which has been modified to _FEATURE_IMPORTANCE_TYPE_MAPPER as per the following issue: issue link.

It appears that the code in onnxmltools has not been updated to reflect this change, leading to the current discrepancy.

[xadupre]

CI now inlcudes lightgbm 4 so this should be fixed if you install onnxmltools from github.

[yungcero]

Commenting just because I just got this error too when running the light gbm converter for the first time today (EDIT: but got it working when installing from github). When do you think this fix will be pushed to the pip repo? @xadupre

[xadupre]

The plan is to release before 12/15.

[ElvisWai]

I'm experiencing the same issue. Please release the latest version as soon as possible.

[xadupre]

Hi sorry for the delay. skl2onnx was released this week. I did not have time to complete the PR #670 to fix xgboost converter for xgboost >= 2. It should be done on Monday.