title: XGBoost crashing kernel in jupyter notebook
body: <p>I don't know how to make the <code>XGBoost</code> classifier work. I am running the code below on Jupyter notebook, and it always generates this message <em>"The kernel appears to have died. It will restart automatically."</em></p>
  
  <pre><code>from xgboost import XGBClassifier
  model = XGBClassifier()
  model.fit(X, y)
  </code></pre>
  
  <p>There is no problem with importing the <code>XGBClassifier</code>, but it crashes upon fitting it to my data. <code>X</code> is a <code>502</code> by 33 all-numeric dataframe, <code>y</code> is the set of 0 or 1 labels for each row. 
  Does anyone know what could be the problem here? I downloaded the newest version of <code>XGBoost</code> through <code>pip3</code> install, and also through <code>Conda</code> install. </p>
  
  <p>Thanks!</p>