DOC Remove unused import from example
@@ -1557,7 +1557,6 @@ class TfidfTransformer(_OneToOneFeatureMixin, TransformerMixin, BaseEstimator):
>>> from sklearn.feature_extraction.text import TfidfTransformer
>>> from sklearn.feature_extraction.text import CountVectorizer
>>> from sklearn.pipeline import Pipeline
- >>> import numpy as np
>>> corpus = ['this is the first document',
... 'this document is the second document',
... 'and this is the third one',
