DOC add feature_names_in_ in the docsring of ColumnTransformer (#27130)

glemaitre · web-flow · commit d8e131c1640f · 2023-09-12T13:04:31.000Z
diff --git a/sklearn/compose/_column_transformer.py b/sklearn/compose/_column_transformer.py
@@ -172,6 +172,12 @@ class ColumnTransformer(TransformerMixin, _BaseComposition):
 
         .. versionadded:: 0.24
 
+    feature_names_in_ : ndarray of shape (`n_features_in_`,)
+        Names of features seen during :term:`fit`. Defined only when `X`
+        has feature names that are all strings.
+
+        .. versionadded:: 1.0
+
     See Also
     --------
     make_column_transformer : Convenience function for
