code: def main(_):
      run_toy_model_tpu()
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import mesh_tensorflow
  import numpy
  import tensorflow.compat.v1
  from tensorflow.compat.v1 import estimator
  from tensorflow.python.data.ops.dataset_ops import Dataset
  from tensorflow.python.platform import flags
  from tensorflow.python.platform import tf_logging
  from tensorflow_estimator.python.estimator import estimator
  from tensorflow_estimator.python.estimator.tpu import tpu_config
  from tensorflow_estimator.python.estimator.tpu import tpu_estimator
label_desc: Use image node_id 4 for calling a global function with example usage: main(_) without return types