docstr: Get RMS for each layer
docstr_tok: ["Get","RMS","for","each","layer"]
code: def _getrms(self):
      """Get RMS for each layer"""
      return [
          math.sqrt(self.sum2[i] / self.count[i]) for i in self.bands
      ]
  
file_path: pillow/src/PIL/ImageStat.py
imports: from __future__ import annotations
  import math
label_desc: Use image node_id 9 for calling the Stat obj's underlying member method code with example usage: obj._getrms() and returns: unknown