code: def _write_vocab(self, string_values, file_name):
      vocab_file = os.path.join(self.get_temp_dir(), file_name)
      with open(vocab_file, "w") as f:
          f.write("\n".join(string_values))
      return vocab_file
  
imports: import os
  import numpy
  from tensorflow.python.checkpoint import checkpoint
  from tensorflow.python.feature_column import feature_column_lib
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import ops
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import init_ops
  from tensorflow.python.ops import variable_scope
  from tensorflow.python.ops import variables
  from tensorflow.python.platform import test
  from tensorflow.python.training import checkpoint_utils
  from tensorflow.python.training import saver
  from tensorflow.python.training import warm_starting_util
label_desc: Use image node_id 1 for calling the WarmStartingUtilTest obj's underlying member method code with example usage: obj._write_vocab(string_values, file_name) and returns: vocab_file