title: scikit Mixtypes of Y error
body: <p>Hi I'm a scikit newbie here. I'm trying to train the computer that given an array of float decide between the 3 classes. I was classifying the classes as 0, 0.5, and 1. I also tried 0, 1.0, and 2.0 . I still get the following error:</p>
  
  <pre><code>File "/Library/Python/2.7/site-packages/sklearn/utils/multiclass.py", line 85, in     unique_labels
  raise ValueError("Mix type of y not allowed, got types %s" % ys_types)
  ValueError: Mix type of y not allowed, got types set(['continuous', 'multiclass'])
  </code></pre>
  
  <p>I have no idea what that error means</p>