title: Predicting probability
body: <p>Trying to use <code>SVC</code> from <code>sklearn</code> to do a classification problem. Given a bunch of data, and information telling me whether some subject is in a certain class or not, I want to be able to give a probability that a new, unknown subject is in a class.</p>
  
  <p>I only have 2 classes, so the problem is binary.  Here is my code and some of my errors</p>
  
  <pre><code>from sklearn.svm import SVC
  clf=SVC()
  
  clf=clf.fit(X,Y)
  
  
  SVC(probability=True)
  print clf.predict_proba(W) #Error is here
  </code></pre>
  
  <p>But it returns the following error:</p>
  
  <pre><code>NotImplementedError: probability estimates must be enabled to use this method 
  </code></pre>
  
  <p>How can I fix this?</p>