code: def reset_parameters(self):
      self.mean.zero_()
      self.mean_sq.zero_()
      self.debiasing_term.zero_()
  
imports: import torch
  import torch.nn
  from torch.distributions import Categorical
  import numpy
  import parl
label_desc: Use image node_id 2 for calling the PopArt obj's underlying member method code with example usage: obj.reset_parameters() without return types