code: def contrast_center_param():
      return fn.random.uniform(range=[0.0, 1.0], seed=123)
  
imports: import nvidia.dali.fn
  from nvidia.dali import pipeline_def
  import nvidia.dali.types
  import numpy
  from test_utils import compare_pipelines, python_function
  from test_utils import RandomDataIterator
  from sequences_test_utils import ArgCb, video_suite_helper
  import random
label_desc: Use image node_id 7 for calling a global function with example usage: contrast_center_param() and returns: fn