code: def gpu(f):
      """Decorator to indicate that GPU is required to run the test.
  
      Tests can be annotated with this decorator (e.g., ``@gpu``) to
      declare that one GPU is required to run.
      """
  
      return multi_gpu(1)(f)
  
imports: import os
  import unittest
label_desc: Use image node_id 5 for calling a global function with example usage: gpu(f) and returns: multi_gpu