code: def get_data_dir():
      pkg = os.path.abspath(__file__)
      pkg, _ = os.path.split(pkg)
      pkg, _ = os.path.split(pkg)
      return os.path.join(pkg, "test_data")
  
file_path: tensor2tensor/tensor2tensor/utils/checkpoint_compatibility_test.py
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import os
  import numpy
  from six.moves import range
  from tensor2tensor import models
  from tensor2tensor import problems
  from tensor2tensor.utils import data_reader
  from tensor2tensor.utils import trainer_lib
  import tensorflow.compat.v1
label_desc: Use image node_id 1 for calling a global function with example usage: get_data_dir() and returns: os