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Warn when _validate_features sets feature_names #4937

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Warn when _validate_features sets feature_names #4937

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3 changes: 3 additions & 0 deletions python-package/xgboost/core.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1819,6 +1819,9 @@ def _validate_features(self, data):
Set feature_names and feature_types from DMatrix
"""
if self.feature_names is None:
warnings.warn("Booster's feature_names did not exist. Booster's "
"feature_names and feature_types are being set to "
"match the data.")
self.feature_names = data.feature_names
self.feature_types = data.feature_types
else:
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