Issues

• TargetEncoder hierarchy priors depend on row order with missing values

  scikit-learn-contrib/category_encoders#555 · Filter by author AryanRG opened on Oct 31, 2026

• Pandas4Warning from OrdinalEncoder and GrayEncoder on pandas 3.1

  scikit-learn-contrib/category_encoders#553 · Filter by author bymarvin opened on Oct 27, 2026

• RankHotEncoder.inverse_transform drops a column when cols are reordered

  scikit-learn-contrib/category_encoders#548 · Filter by author AryanRG opened on Oct 19, 2026

• JamesSteinEncoder(model='binary') shares mu through a module-level global, so concurrent fits can corrupt each other

  scikit-learn-contrib/category_encoders#546 · Filter by author syahra712 opened on Oct 17, 2026

• JamesSteinEncoder binary model accepts numeric classes outside {0, 1}

  scikit-learn-contrib/category_encoders#532 · Filter by author AHMETHAKANBEZIR1 opened on Oct 2, 2026

• JamesSteinEncoder independent model returns NaN for constant targets

  scikit-learn-contrib/category_encoders#530 · Filter by author AHMETHAKANBEZIR1 opened on Oct 2, 2026

• OneHotEncoder(sparse=True)

  enhancement
  scikit-learn-contrib/category_encoders#230 · Filter by author zachmayer opened on Jan 7, 2020
  11

• K-fold target encoding to mitigate overfitting risks

  enhancement
  scikit-learn-contrib/category_encoders#133 · Filter by author fingoldo opened on Oct 15, 2018
  13