code: def expand(self, child_priors):
      self.is_expanded = True
      self.total_value = 0
      self.parent.child_total_value[self.action] = 0
      self.child_priors = child_priors
  
imports: import collections
  import copy
  import math
  import numpy
label_desc: Use image node_id 10 for calling the Node obj's underlying member method code with example usage: obj.expand(child_priors) without return types