code: def _get(self, field):
          
  
          opts = {'model': self.__proxy__, 'field': field}
          response = _turicreate.extensions._text.topicmodel_get_value(opts)
          return response['value']
docs: Return the value of a given field. The list of all queryable fields is
          detailed below, and can be obtained with the
          :py:func:`~TopicModel._list_fields` method.
  
          +-----------------------+----------------------------------------------+
          |      Field            | Description                                  |
          +=======================+==============================================+
          | topics                | An SFrame containing a column with the unique|
          |                       | words observed during training, and a column |
          |                       | of arrays containing the probability values  |
          |                       | for each word given each of the topics.      |
          +-----------------------+----------------------------------------------+
          | vocabulary            | An SArray containing the words used. This is |
          |                       | same as the vocabulary column in the topics  |
          |                       | field above.                                 |
          +-----------------------+----------------------------------------------+
  
          Parameters
          ----------
          field : string
              Name of the field to be retrieved.
  
          Returns
          -------
          out
              Value of the requested field.