Fix/val_sample_weight error for models inherited from RegressionModel #2626
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Checklist before merging this PR:
Fix the bug in #2579 that causes an error when
val_sample_weight
is set in the CatBoost and XGBoost models.Summary
The CatBoost and XGBoost models, which inherit from the RegressionModel class, encounter an error when setting val_sample_weight. This issue is resolved by modifying the _add_val_set_to_kwargs method in RegressionModel, changing val_weights = val_weight to val_weights = [val_weight].
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