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print(f"{len(df_train)} samples in train") df_val, df_test = train_test_split(df_val, stratify=df_val['target'], test_size=0.5) print(f"{len(df_val)} samples in val") print(f"{len(df_test)} samples in test") return df_train, df_val, df_test # src/train.py import catboost as cb import pandas as pd