title: How to generate ROC curve for decision tree?
body: <p>I have implemented a decision tree, I wish to evaluate it by ROC curve. </p>
  
  <p>However, I have no idea how to define the threshold for it. As far as I known, the performance of a decision tree can be represented by a single confusion matrix, so it should correspond to a single point in the ROC graph. How should I make a curve?</p>
  
  <p>Thanks!</p>