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                                            Zeyu1994

Upgrading to 1.0.0-rc2 results in a large drop in classification performance using LightGBMClassifier.

Same problem when using LightGBMRegressor on Databricks runtime 6.6 ML. The feature importance looks strange and a lot of zero there. v1.0 importance: `[0.0, 0.0, 0.0, 17.0, 0.0, 0.0, 0.0,...

found some annotation errors in 'longbook_qa_chn'

似乎"萧锋"是“萧炎”的替换，那么QA的就对了。但是在context里面并没有替换成功。