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Migrate DecisionTreeDiscretiser to narwhals, add polars support - #1042

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solegalli merged 10 commits into

narwhals-migrationfrom

narwhals-decision-tree-discretiser

Sep 18, 2026

Merged

Migrate DecisionTreeDiscretiser to narwhals, add polars support#1042
solegalli merged 10 commits into
narwhals-migrationfrom
narwhals-decision-tree-discretiser

Commits on Sep 18, 2026
- Migrate DecisionTreeDiscretiser to narwhals, add polars support
  
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  8ec3881
- Use shared backend test fixtures and helpers in DecisionTreeDiscretiser tests
  
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  8fbee37
- Use frame_to_dict after the shared helper rename in #1045
  
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  f8b079a
- Group init tests and match errors in DecisionTreeDiscretiser tests, check bin_output type
  
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  c3a7ffb
- Move DecisionTreeDiscretiser helper functions into the class as private methods
  
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  fc12998
- Simplify the n_jobs note in the DecisionTreeDiscretiser user guide
  
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  0afb0d2
- Use the scikit-learn wording for n_jobs in DecisionTreeDiscretiser
  
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  c701ca4
- Call is_pandas_dataframe in the condition instead of storing it
  
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  8460d13
- Shorten comment in DecisionTreeDiscretiser.transform
  
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  68ae21c
- Reorder DecisionTreeDiscretiser tests to the test file convention
  
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  f9c58a8