title: what does this arg max notation mean in the scikit-learn docs for Naive Bayes?
body: <p>I'm referring to the following page on Naive Bayes:</p>
  
  <p><a href="http://scikit-learn.org/stable/modules/naive_bayes.html" rel="nofollow noreferrer">http://scikit-learn.org/stable/modules/naive_bayes.html</a></p>
  
  <p>Specifically the equation beginning with y-hat. I think I generally understand the equations before that, but I don't understand the "arg max y" notation on that line. What does it mean?</p>