Khalim Conn-Kowlessar 6072d8795a slice 16i: MAE + RMSE in metrics; sample_weight_fn + low_sap_tail_weight ... train_baseline now returns mae + rmse alongside mape/smape/r2. MAE is the user-facing metric ("predicted SAP within N points"); RMSE the quadratic counterpart. Both come straight from sklearn. New sample_weight_fn parameter: callable(y_train) -> per-row weights. Threads into LGBMRegressor.fit's sample_weight argument. Default None preserves existing behaviour. Default tail strategy exposed as low_sap_tail_weight(y, threshold=58, weight=3): 3x weight where SAP < 58. Threshold picked from slice 16h's per-decile residuals — decile 0 (SAP 1-58) carries 17% MAPE vs <5% body. Three TDD tracers, all AAA.		2026-05-17 14:48:00 +00:00
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unit	slice 16i: MAE + RMSE in metrics; sample_weight_fn + low_sap_tail_weight	2026-05-17 14:48:00 +00:00
__init__.py	slice 14a: ml_training_data pkg + sample.py (CSV filter + random sample)	2026-05-16 17:39:43 +00:00