code: def stdev(self):
      return statistics.stdev(self.data) if len(self.data) > 1 else 0
  
imports: import logging
  import math
  import statistics
  from typing import TYPE_CHECKING, Any, Callable, Dict, Optional
  import numpy
  import torch
  import torch.distributed
  from monai.config import IgniteInfo
  from monai.metrics import compute_dice
  from monai.utils import min_version, optional_import
label_desc: Use image node_id 5 for calling the RegionDice obj's underlying member method code with example usage: obj.stdev() and returns: unknown