class_docstr: Calculating running mean and variance
  https://en.wikipedia.org/wiki/Algorithms_for_calculating_variance#Parallel_algorithm
class_docstr_tok: ["Calculating","running","mean","and","variance","https",":","\/\/en.wikipedia.org\/wiki\/Algorithms_for_calculating_variance","#","Parallel_algorithm"]
code: def update_from_moments(self, batch_mean, batch_var, batch_count):
      (
          self.mean,
          self.var,
          self.count,
      ) = update_mean_var_count_from_moments(
          self.mean,
          self.var,
          self.count,
          batch_mean,
          batch_var,
          batch_count,
      )
  
imports: import numpy
  import gym
  import time
  from parl.env.compat_wrappers import CompatWrapper
label_desc: Use image node_id 3 for calling the RunningMeanStd obj's underlying member method code with example usage: obj.update_from_moments(batch_mean, batch_var, batch_count) without return types