code: def Contrast_setup():
      tforms = {}
      tforms["contrast_<<0"] = Contrast(-10)
      tforms["contrast_<0"] = Contrast(-1)
      tforms["contrast_=0"] = Contrast(0)
      tforms["contrast_>0"] = Contrast(1)
      tforms["contrast_>>0"] = Contrast(10)
  
      tforms["random_contrast_01"] = RandomContrast(-10, -1)
      tforms["random_contrast_02"] = RandomContrast(-1, 0)
      tforms["random_contrast_03"] = RandomContrast(0, 1)
      tforms["random_contrast_04"] = RandomContrast(1, 10)
  
      tforms["random_choice_saturation_01"] = RandomChoiceContrast(
          [-1, 0, 1]
      )
      tforms["random_choice_saturation_02"] = RandomChoiceContrast(
          [-10, 0, 10], p=[0.2, 0.5, 0.3]
      )
      tforms["random_choice_saturation_03"] = RandomChoiceContrast(
          [1, 1], p=[0.5, 0.5]
      )
  
      return tforms
  
file_path: pywick/tests/unit/transforms/test_image_transforms.py
imports: import torch
  from pywick.transforms import Grayscale, RandomGrayscale, Gamma, RandomGamma, RandomChoiceGamma, Brightness, RandomBrightness, RandomChoiceBrightness, Saturation, RandomSaturation, RandomChoiceSaturation, Contrast, RandomContrast, RandomChoiceContrast
label_desc: Use image node_id 9 for calling a global function with example usage: Contrast_setup() and returns: tforms