docstr: Get standard deviation for each layer
docstr_tok: ["Get","standard","deviation","for","each","layer"]
code: def _getstddev(self):
      """Get standard deviation for each layer"""
  
      v = []
      for i in self.bands:
          v.append(math.sqrt(self.var[i]))
      return v
  
file_path: catboost/contrib/python/Pillow/py2/PIL/ImageStat.py
imports: import functools
  import math
  import operator
label_desc: Use image node_id 11 for calling the Stat obj's underlying member method code with example usage: obj._getstddev() and returns: v