code: def _get_pixel(im, x, y, c):
      return im[c][y][x]
  
imports: from __future__ import division
  import math
  from collections import namedtuple
  from functools import cmp_to_key
  import numpy
label_desc: Use image node_id 15 for calling a global function with example usage: _get_pixel(im, x, y, c) and returns: im