title: unable to use TfidfVectorizer in Google app engine
body: <p>I am writing a python program in Google App Engine that calculates tf-idf using TfidfVectorizer in sklearn. </p>
  
  <p>I have added sklearn library and have the import as: </p>
  
  <pre><code>from sklearn.feature_extraction.text import TfidfVectorizer
  </code></pre>
  
  <p>However it gives me <code>no module named _check_build</code> although it is in the library that I have imported.</p>
  
  <p>Note: I have the same code in pure python and it works just fine so there is nothing wrong with the python syntax or imports; The problem starts with GAE.</p>
  
  <p>Do you know any way to solve this issue?</p>