DOC add missing parentheses in TfidfTrasnformer docstring

jnothman · jnothman · commit eabaef3145e0 · 2017-01-16T23:11:29.000+11:00
diff --git a/sklearn/feature_extraction/text.py b/sklearn/feature_extraction/text.py
@@ -966,7 +966,7 @@ class TfidfTransformer(BaseEstimator, TransformerMixin):
     If ``smooth_idf=True`` (the default), the constant "1" is added to the
     numerator and denominator of the idf as if an extra document was seen
     containing every term in the collection exactly once, which prevents
-    zero divisions: idf(d, t) = log [ (1 + n) / 1 + df(d, t) ] + 1.
+    zero divisions: idf(d, t) = log [ (1 + n) / (1 + df(d, t)) ] + 1.
 
     Furthermore, the formulas used to compute tf and idf depend
     on parameter settings that correspond to the SMART notation used in IR
