class_docstr: A mutable class that allows us to aggregate values and report mean/stddev.
class_docstr_tok: ["A","mutable","class","that","allows","us","to","aggregate","values","and","report","mean\/stddev","."]
code: def _update_mean_variance_stddev(self):
      self._update_stddev()
  
file_path: H2O/h2o_hf/helm/src/helm/benchmark/metrics/statistic.py
imports: from dataclasses import dataclass, replace
  import math
  from typing import Dict, Optional
  from .metric_name import MetricName
label_desc: Use image node_id 8 for calling the Stat obj's underlying member method code with example usage: obj._update_mean_variance_stddev() without return types