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- StandardScaler: handle zero-variance/null columns (ZeroDivisionError fix) - DropHighNaNRatio: rename threshold= -> max_ratio= in docs and examples - VarianceFilter: rename threshold= -> min_var= in docs and examples - CorrelationFilter: rename threshold= -> max_corr= in docs and examples - Pipeline: use keyword arg steps=[...] instead of positional list in docs and tests
…umns When a column has equal min and max values (zero range), computing 1.0 / (max - min) raises ZeroDivisionError. Apply the same guard pattern used in StandardScaler: set scale to 0.0 for constant or all-null columns instead of dividing by zero.
safe divide in scaler.py
Format with black minmax_scalaer
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Optimize discretizers for performance