code: def train_func():
      batch_size = 64
      single_worker_dataset = mnist_dataset(batch_size)
      single_worker_model = build_and_compile_cnn_model()
      single_worker_model.fit(
          single_worker_dataset, epochs=3, steps_per_epoch=70
      )
  
file_path: ray/python/ray/train/examples/tf/tensorflow_quick_start.py
imports: import numpy
  import tensorflow
  import json
  import os
label_desc: Use image node_id 3 for calling a global function with example usage: train_func() without return types