CountVectorizer - Vocabulary wasn't fitted

Why this is not working?

from sklearn.feature_extraction.text import CountVectorizer  bow = CountVectorizer()  X = bow.transform(["pippo","pluto"])  X.shape  

I have the following error:

CountVectorizer - Vocabulary wasn't fitted.  AppData\Local\Programs\Python\Python36\lib\site-packages\sklearn\utils\validation.py", line 951, in check_is_fitted      raise NotFittedError(msg % {'name': type(estimator).__name__})`  

https://stackoverflow.com/questions/65741120/countvectorizer-vocabulary-wasnt-fitted January 16, 2021 at 01:49AM