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I came across the following error while fitting a LightGBM classification model. All of the features in use are numerical with around 20% missing values. The target variable is binary. Could I know how this error (Check failed: best_split_info.left_count > 0) is resulted?

from lightgbm import LGBMClassifier


lgb_model = LGBMClassifier()
lgb_model.fit(train[predictors], train['is_booked'])

enter image description here

Wang Shenghao
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