code: def __init__(self, tau=1e-3, scale=1, eps=1e-1):
      self.tau = tau
      self.scale = scale
      self.average_reward = 0
      self.average_reward_squared = 0
      self.eps = eps
  
file_path: chainerrl/chainerrl/misc/reward_filter.py
label_desc: Use image node_id 1 to create a new NormalizedRewardFilter object from inherited base classes: object with example: obj = NormalizedRewardFilter(tau, scale, eps)