code: def snapshot(self, new_score: float) -> bool:
      self.num_snapshot += 1
      self._incrementer.update(new_score)
      if self.num_snapshot <= self.window_size:
          return False
      mean, std = self._incrementer.mean, self._incrementer.std
      ratio = max(abs(new_score - mean) / max(std, 1.0e-8), 1.0e-8)
      if ratio < self.plateau_threshold:
          plateau = min(
              self.max_plateau_increase,
              1.0 / ratio - 1.0 / self.plateau_threshold,
          )
          self.plateau_level += plateau
      return False
  
imports: import math
  from typing import Optional
  from cftool.misc import Incrementer
  from .schema import TrainerMonitor
label_desc: Use image node_id 3 for calling the PlateauMonitor obj's underlying member method code with example usage: obj.snapshot(new_score) and returns: False, False