This function returns the examples in the raw (text) form.

def _generate_examples(self, data_file):
    """This function returns the examples in the raw (text) form."""
    with tf.io.gfile.GFile(data_file) as f:
      reader = csv.DictReader(f, delimiter='\t', quoting=csv.QUOTE_NONE)
      for row in reader:
        # Everything in the row except for 'talk_name' will be a translation.
        # Missing/incomplete translations will contain the string "__NULL__" or
        # "_ _ NULL _ _".
        yield {
            'translations': {
                lang: text
                for lang, text in six.iteritems(row)
                if lang != 'talk_name' and _is_translation_complete(text)
            },
            'talk_name': row['talk_name']
        }