title: how to tokenize a set of documents into unigram + bigram bagofwords using gensim?
body: <p>I know from using scikit learn i could use,</p>
  
  <pre><code>vectorizer = TfidfVectorizer(min_df=2,ngram_range=(1, 2),norm='l2')
  
  corpus = vectorizer.fit_transform(text)
  </code></pre>
  
  <p>This piece of code. But how could i do this with gensim?</p>