Revert a feature tagged as DOC

glemaitre · glemaitre · commit fb03c98af557 · 2022-08-05T14:58:55.000+02:00
diff --git a/sklearn/feature_extraction/text.py b/sklearn/feature_extraction/text.py
@@ -1511,7 +1511,7 @@ class TfidfTransformer(_OneToOneFeatureMixin, TransformerMixin, BaseEstimator):
 
     Parameters
     ----------
-    norm : {'l1', 'l2'} or None, default='l2'
+    norm : {'l1', 'l2'}, default='l2'
         Each output row will have unit norm, either:
 
         - 'l2': Sum of squares of vector elements is 1. The cosine
@@ -1685,7 +1685,7 @@ def transform(self, X, copy=True):
             # *= doesn't work
             X = X * self._idf_diag
 
-        if self.norm is not None:
+        if self.norm:
             X = normalize(X, norm=self.norm, copy=False)
 
         return X
