title: Plotting reward curve in reinforcement learning
body: <p>I'm wondering how to plot reward curves in reinforcement learning.</p>
  
  <p>Especially, my simulated environment has significant randomness.
  So there are so many zig-zag patterns in raw data of reward even though the output policy is converged.</p>
  
  <p>Is there any way to plot in this case?</p>