project_root/ ├── src/ │ ├── main.py # Hydra entry point │ ├── train.py # run_train / run_optuna / run_infer │ ├── entrypoints.py # argparse CLI adapters │ ├── data/ │ │ ├── preprocess.py # raw -> ...

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Overview: Poor data validation, leakage, and weak preprocessing pipelines cause most XGBoost and LightGBM model failures in production.Default hyperparameters, ...