Issues

• output_format="auto" chooses sparse vs dense per transform batch, breaking dense-only estimators at predict

  bug
  OpenTabular/PreTab#73 · Filter by author ChrisW09 opened on Oct 2, 2026

• Preprocessor.transform does not check n_features_in_ for ndarray input; extra columns are silently misaligned

  bug
  OpenTabular/PreTab#72 · Filter by author ChrisW09 opened on Oct 2, 2026

• Preprocessor.fit crashes when a column name starts with '_' or contains '__'

  bug
  OpenTabular/PreTab#71 · Filter by author ChrisW09 opened on Oct 2, 2026

• CART location selector can drop the dominant split because spacing is enforced in ascending location order

  bug
  OpenTabular/PreTab#70 · Filter by author ChrisW09 opened on Oct 2, 2026

• Target-aware spline placement trims selector knots by position, discarding the most informative splits; adaptive width capped at 15

  bug
  OpenTabular/PreTab#69 · Filter by author ChrisW09 opened on Oct 2, 2026

• configure_logging pins the verbosity level after the first call and duplicates lines under a configured root logger

  bug
  OpenTabular/PreTab#67 · Filter by author ChrisW09 opened on Oct 2, 2026

• to_spec / fingerprint_ fail or write unloadable specs for object arrays of numpy scalars and builtin dtypes

  bug
  OpenTabular/PreTab#66 · Filter by author ChrisW09 opened on Oct 2, 2026

• Preprocessor.get_feature_names_out(input_features) fails after fitting on an ndarray, breaking Pipeline.get_feature_names_out()

  bug
  OpenTabular/PreTab#65 · Filter by author ChrisW09 opened on Oct 2, 2026

• None / pd.NA categorical missing values are not treated as missing (nullable dtypes crash, None becomes a category)

  bug
  OpenTabular/PreTab#64 · Filter by author ChrisW09 opened on Oct 2, 2026

• MSplineTransformer: absolute clipping thresholds make the basis depend on feature scale

  bug
  OpenTabular/PreTab#63 · Filter by author ChrisW09 opened on Oct 2, 2026

• add_missing_indicator / impute_with_indicator feeds the indicator through the scaler and basis; lineage crashes

  bug
  OpenTabular/PreTab#62 · Filter by author ChrisW09 opened on Oct 2, 2026

• LightGBM placement with task="classification" always uses the binary objective on raw labels

  bug
  OpenTabular/PreTab#61 · Filter by author ChrisW09 opened on Oct 2, 2026

• set_output(transform="pandas") drops the input index, breaking ColumnTransformer/FeatureUnion composition

  bug
  OpenTabular/PreTab#60 · Filter by author ChrisW09 opened on Oct 2, 2026

• Preprocessor(numerical_method="box-cox") raises at transform for values below the training minimum

  bug
  OpenTabular/PreTab#59 · Filter by author ChrisW09 opened on Oct 2, 2026

• CrossFittedTransformer converts DataFrames to ndarray; a wrapped Preprocessor treats every column as categorical

  bug
  OpenTabular/PreTab#58 · Filter by author ChrisW09 opened on Oct 2, 2026

• Target-aware location selectors return too few, duplicate, or boundary locations on tied/discrete features

  bug
  OpenTabular/PreTab#57 · Filter by author ChrisW09 opened on Oct 2, 2026

• Spline knots on tied data land on the range boundary or repeat, producing dead columns and all-zero rows

  bug
  OpenTabular/PreTab#56 · Filter by author ChrisW09 opened on Oct 2, 2026

• Preprocessor routes integer column labels positionally, silently swapping columns

  bug
  OpenTabular/PreTab#55 · Filter by author ChrisW09 opened on Oct 2, 2026

• Preprocessor.fit crashes on any bool column under default settings

  bug
  OpenTabular/PreTab#54 · Filter by author ChrisW09 opened on Oct 2, 2026

• ISplineTransformer: 200-point trapezoid integration produces wrong and all-zero basis columns

  bug
  OpenTabular/PreTab#53 · Filter by author ChrisW09 opened on Oct 2, 2026