title: Calculating AUC when using Vowpal Wabbit
body: <p>Is there anyway to compute AUC within Vowpal Wabbit?</p>
  
  <p>One of the reasons I am using Vowpal Wabbit is the large size of the data file.
  I can calculate the AUC outside of the Vowpal Wabbit environment using the output of Vowpal Wabbit but this might be problematic if the data file is large.</p>