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Validate unique column names in pandas. #12199

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trivialfis merged 3 commits into from
May 10, 2026
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Merged

Validate unique column names in pandas. #12199

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f2ce907
Validate unique column names in pandas.
trivialfis May 8, 2026
f08114c
Potential fix for pull request finding
trivialfis May 8, 2026
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trivialfis May 9, 2026
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5 changes: 5 additions & 0 deletions python-package/xgboost/data.py
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Original file line number Diff line number Diff line change
Expand Up @@ -657,6 +657,11 @@ def _transform_pandas_df(
) -> Tuple[PandasTransformed, Optional[FeatureNames], Optional[FeatureTypes]]:
if meta and len(data.columns) > 1 and meta not in _matrix_meta:
raise ValueError(f"DataFrame for {meta} cannot have multiple columns")
if data.columns.has_duplicates:
duplicates = data.columns[data.columns.duplicated()].unique().tolist()
raise ValueError(
f"Duplicate column names are not supported. Duplicates found: {duplicates}"
)

feature_types, ref_categories = get_ref_categories(feature_types)
feature_names, feature_types = pandas_feature_info(
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