code: def testEmptyLeading(self):
      export.export_module_from_file(
          embedding_file=self._embedding_file_path,
          export_path=self.get_temp_dir(),
          parse_line_fn=export.parse_line,
          num_oov_buckets=1,
          preprocess_text=True,
      )
      with tf.Graph().as_default():
          hub_module = hub.Module(self.get_temp_dir())
          tokens = tf.constant(["", "cat dog"])
          embeddings = hub_module(tokens)
          with tf.Session() as session:
              session.run(tf.tables_initializer())
              session.run(tf.global_variables_initializer())
              self.assertAllClose(
                  session.run(embeddings),
                  [[0.0, 0.0, 0.0], [1.49, 3.22, 4.56]],
                  rtol=0.02,
              )
  
file_path: hub/examples/text_embeddings/export_test.py
imports: import logging
  import os
  from distutils.version import LooseVersion
  import numpy
  import tensorflow.compat.v1
  import tensorflow_hub
  from examples.text_embeddings import export
label_desc: Use image node_id 6 for calling the ExportTokenEmbeddingTest obj's underlying member method code with example usage: obj.testEmptyLeading() without return types