docstr: Return number of episode rewards
  
  # Returns
      Number of episode rewards
docstr_tok: ["Return","number","of","episode","rewards","#","Returns","Number","of","episode","rewards"]
code: def nb_entries(self):
      """Return number of episode rewards
  
      # Returns
          Number of episode rewards
      """
      return len(self.total_rewards)
  
imports: from __future__ import absolute_import
  from collections import deque, namedtuple
  import warnings
  import random
  import numpy
label_desc: Use image node_id 5 for calling the EpisodeParameterMemory obj's underlying member method code with example usage: obj.nb_entries() and returns: len