Data Splits and Leakage
Block target, group, temporal, and preprocessing leakage by defining prediction time, entities, and train-only pipelines.
Block target, group, temporal, and preprocessing leakage by defining prediction time, entities, and train-only pipelines.
Start from deployment distribution, splits, metrics, thresholds, and uncertainty instead of treating one test score as universal ability.
Build forecasts from data available at prediction time, evaluate multiple horizons at rolling origins, and separate model selection, trading costs, and the final holdout.