title: Can you fix the false negative rate in a classifier in scikit learn
body: <p>I am using a <a href="http://scikit-learn.org/stable/modules/generated/sklearn.ensemble.RandomForestClassifier.html" rel="noreferrer">Random Forest classifer</a> in scikit learn with an imbalanced data set of two classes. I am much more worried about false negatives than  false positives.  Is it possible to fix the false negative rate (to, say, 1%) and ask scikit to optimize the false positive rate somehow?</p>
  
  <p>If this classifier doesn't support it, is there another classifier that  does?</p>