code: def auto_select_backend():
      for backend_name, test in BACKEND_TESTS.items():
          if test():
              name = backend_name
              break
      else:
          name = config.default_backend
  
      return name
  
file_path: fiber/fiber/backend.py
imports: import os
  import importlib
  import multiprocessing
  import fiber.config
label_desc: Use image node_id 3 for calling a global function with example usage: auto_select_backend() and returns: name