title: How to set `class_weight` in version 0.14 of sklearn?
body: <p>I know that there is a <code>class_weight</code> parameter in the version 0.17 of <code>sklearn.ensemble.RandomForestClassifier</code>.  </p>
  
  <p>I cannot install 0.17.  How do I access this parameter in version 0.14?  </p>
  
  <p>Or, is there another way to deal with imbalanced labels (<code>y values</code>) in a <code>RandomForestClassifier</code>?  I have a binary classifier with many more negatives than positives, which naturally skews the results, so I want to set the class weights to offset this.  </p>