code: def objective(config, checkpoint_dir=None):
      for _i in range(30):
          loss = config["mean"] + config["sd"] * np.random.randn()
          session.report({"loss": loss})
  
file_path: wandb/tests/functional_tests/t0_main/raytune/t2_callback.py
imports: import numpy
  from _test_support import get_wandb_api_key_file
  from ray import air, tune
  from ray.air import session
  from ray.air.callbacks.wandb import WandbLoggerCallback
label_desc: Use image node_id 1 for calling a global function with example usage: objective(config, checkpoint_dir) without return types