title: What does clf mean in machine learning?
body: <p>When doing fitting, I always come across code like</p>
  
  <pre><code>clf = svm.SVC(kernel='linear', C=1).fit(X_train, y_train)
  </code></pre>
  
  <p>(from <a href="http://scikit-learn.org/stable/modules/cross_validation.html#k-fold" rel="noreferrer">http://scikit-learn.org/stable/modules/cross_validation.html#k-fold</a>)</p>
  
  <p>What does <code>clf</code> stand for? I googled around but didn't find any clues.</p>