while direct fits raise an error.
- Changing objective-weight normalization, softmax stabilization, metric-type
validation, or bound publication resets label HPO selection state
- (selection schema 4). The persisted best-params JSON layout remains
+ (selection schema 3). The persisted best-params JSON layout remains
independently versioned.
### Backtest evaluation protocol
"""
-_OPTUNA_LABEL_SELECTION_SCHEMA_VERSION: Final[int] = 4
+_OPTUNA_LABEL_SELECTION_SCHEMA_VERSION: Final[int] = 3
"""Version of the label-namespace Optuna best-trial selection algorithm.
Incremented on any change to tie-break, normalization, distance-metric