Node (https://arxiv.org/src/1911.08265v1/anc/pseudocode.py)

pseudocode.py

class Node(object):

  def __init__(self, prior: float):
    self.visit_count = 0
    self.to_play = -1
    self.prior = prior
    self.value_sum = 0
    self.children = {}
    self.hidden_state = None
    self.reward = 0

  def expanded(self) -> bool:
    return len(self.children) > 0

  def value(self) -> float:
    if self.visit_count == 0:
      return 0
    return self.value_sum / self.visit_count