docstr: Get variance for each layer
docstr_tok: ["Get","variance","for","each","layer"]
code: def _getvar(self):
      """Get variance for each layer"""
  
      v = []
      for i in self.bands:
          n = self.count[i]
          v.append((self.sum2[i] - (self.sum[i] ** 2.0) / n) / n)
      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 10 for calling the Stat obj's underlying member method code with example usage: obj._getvar() and returns: v