title: Predicting how long an scikit-learn classification will take to run
body: <p>Is there a way to predict how long it will take to run a classifier from sci-kit learn based on the parameters and dataset?  I know, pretty meta, right?</p>
  
  <p>Some classifiers/parameter combinations are quite fast, and some take so long that I eventually just kill the process.  I'd like a way to estimate in advance how long it will take.</p>
  
  <p>Alternatively, I'd accept some pointers on how to set common parameters to reduce the run time.</p>