title: sklearn (Bad Input Shape) ValueError
body: <p>I am new to the world of ML and sklearn. I tried to use GaussianNB on a dataset with <code>X_train[2500,800]</code>, <code>Y_train[2500,8]</code>. </p>
  
  <pre><code>from sklearn.naive_bayes import GaussianNB
  clf = GaussianNB()
  clf.fit(X, Y)
  </code></pre>
  
  <p>On running the program, it is showing </p>
  
  <blockquote>
    <p>ValueError: bad input shape (2500, 8). </p>
  </blockquote>
  
  <p>How do i convert <code>Y_train[2500,8]</code> to <code>Y_train[2500,1]</code>?</p>