code: def ray_start_4_cpus():
      address_info = ray.init(num_cpus=4)
      yield address_info
      # The code after the yield will run as teardown code.
      ray.shutdown()
  
file_path: ray/python/ray/train/tests/test_tensorflow_trainer.py
imports: import os
  import tempfile
  import pytest
  import ray
  from ray import train
  from ray.data.preprocessors import Concatenator
  from ray.train import ScalingConfig
  from ray.train.constants import TRAIN_DATASET_KEY
  from ray.train.examples.tf.tensorflow_regression_example import train_func
  from ray.train.tensorflow import TensorflowCheckpoint, TensorflowTrainer
label_desc: Use image node_id 1 for calling a global function with example usage: ray_start_4_cpus() without return types