code: def train_func(config):
      logger = None
      if ray.train.get_context().get_world_rank() == 0:
          logger = CometLogger(api_key=os.environ["COMET_API_KEY"])
  
      ptl_trainer = pl.Trainer(
          max_epochs=5,
          accelerator="cpu",
          logger=logger,
          log_every_n_steps=1,
      )
      model = DummyModel()
      ptl_trainer.fit(model, train_dataloaders=dataloader)
  
file_path: ray/python/ray/train/examples/experiment_tracking/lightning_exp_tracking_comet.py
imports: from lightning_exp_tracking_model_dl import DummyModel, dataloader
  import os
  import pytorch_lightning
  from pytorch_lightning.loggers.comet import CometLogger
  import ray
  from ray.train import ScalingConfig
  from ray.train.torch import TorchTrainer
label_desc: Use image node_id 1 for calling a global function with example usage: train_func(config) without return types