code: def __init__(self, env, state=None):
      self.parent = None
      self.child_total_value = collections.defaultdict(float)
      self.child_number_visits = collections.defaultdict(float)
      self.env = env
      if state is None:
          self.state = env.get_state()
      else:
          self.state = state
  
imports: import collections
  import copy
  import math
  import numpy
label_desc: Use image node_id 1 to create a new RootParentNode object  with example: obj = RootParentNode(env, state)