code: def _randomly_negate(v):
      """With 50% prob, negate the value"""
      return -v if random.random() > 0.5 else v
  
imports: import math
  import numpy
  import random
  import re
  import PIL
  from PIL import Image, ImageEnhance, ImageOps
label_desc: Use image node_id 20 for calling a global function with example usage: _randomly_negate(v) and returns: unknown