code: def autocontrast(x, level):
      return _imageop(x, ImageOps.autocontrast, level)
  
imports: import random
  from collections import namedtuple
  import numpy
  from PIL import Image, ImageOps, ImageEnhance, ImageFilter
label_desc: Use image node_id 6 for calling a global function with example usage: autocontrast(x, level) and returns: _imageop