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Migrate DecisionTreeEncoder to narwhals, add polars support - #1026

Merged

solegalli merged 8 commits into

narwhals-migrationfrom

narwhals-decision-tree-encoder

Sep 18, 2026

Merged

Migrate DecisionTreeEncoder to narwhals, add polars support#1026
solegalli merged 8 commits into
narwhals-migrationfrom
narwhals-decision-tree-encoder

Commits on Sep 18, 2026
- Migrate DecisionTreeEncoder to narwhals, add polars support
  
  solegalli
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  claude
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  154f112
- Adapt DecisionTreeEncoder to narwhals-returning check_X
  
  solegalli
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  592e0a4
- Use shared backend test fixtures and helpers in DecisionTreeEncoder tests
  
  solegalli
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  9d76c81
- Use frame_to_dict after the shared helper rename in #1045
  
  solegalli
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  0f33880
- Use add_target_to_X in DecisionTreeEncoder, check encoding_method type, tidy tests
  
  solegalli
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  67ee9f7
- Shorten n_jobs docstring in DecisionTreeEncoder
  
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  ec15072
- Build DecisionTreeEncoder on OrdinalEncoder and DecisionTreeDiscretiser
  
  solegalli
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  12cb0b9
- Test DecisionTreeEncoder with integer column names
  
  solegalli
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  10e728b