code: def __len__(self):
      return len(self.colors)
  
file_path: PaddleSeg/EISeg/eiseg/util/colormap.py
imports: import os.path
  import random
  from eiseg import pjpath
label_desc: Use image node_id 3 for calling the ColorMap obj's underlying member method code with example usage: obj.__len__() and returns: len