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scikit-learn__scikit-learn-25570

Based on the issue description and my knowledge of scikit-learn's ColumnTransformer, I can analyze the bug and create the fix. The issue is in the _hstack method of _column_transformer.py where the pandas output handling doesn't properly…

  • Skills
  • AI research
  • 4

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A skill that teaches Claude Code to do ai research tasks well. It is packaged knowledge the model uses whenever it is relevant.

  1. Install the skill (command above).
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Install (Claude Code)

mkdir -p .claude/skills/scikit-learn-scikit-learn-25570 && curl -fsSL https://doutorai.pt/data/lib/skills__scikit-learn-scikit-learn-25570.md -o .claude/skills/scikit-learn-scikit-learn-25570/SKILL.md

Paste this command into the terminal, in your project folder, and the component installs automatically.

Content

Based on the issue description and my knowledge of scikit-learn's ColumnTransformer, I can analyze the bug and create the fix. The issue is in the `_hstack` method of `_column_transformer.py` where the pandas output handling doesn't properly account for transformers with zero features.

Looking at the traceback:
1. Line 750: `fit_transform` calls `self._hstack(list(Xs))`
2. Line 862: `output.columns = names_out` - This is where the error occurs

The bug is that when generating feature names for pandas output, `_add_prefix_for_feature_names_out` uses `self._iter(fitted=True)` which skips transf

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