code: def plot(self):
      import matplotlib.pyplot as plt
  
      plt.hist(self.rets)
      plt.savefig("histogram_rets.png")
      plt.close()
  
file_path: baselines/baselines/gail/dataset/mujoco_dset.py
imports: from baselines import logger
  import numpy
label_desc: Use image node_id 4 for calling the Mujoco_Dset obj's underlying member method code with example usage: obj.plot() without return types