Scores that never see the future.
On financial panels, an honest score is the whole product, so leakage protection is built into every split, not left to the user.
- Purged walk-forward cross-validation with an embargo, plus a multi-date holdout, for time-ordered data; seeded grouped or stratified K-fold for plain tables, chosen automatically from the data's roles.
- Leakage protection proven, not assumed: a positive-control test plants a deliberately leaky column and confirms the pipeline catches it.
- Panel leaderboards rank on holdout Rank IC IR (Spearman IC mean over its standard deviation across dates), the metric a quant desk actually trades on; plain tables rank on R² or balanced accuracy.