class_docstr: Create topic model widget.
docstr: Type of model which either already has been or will be trained.
code: def model_type(self):
      """Type of model which either already has been or will be trained."""
      return self._model_type
  
imports: import warnings
  from typing import List, Optional, Dict, Tuple, TYPE_CHECKING
  import pandas
  import numpy
  from sklearn.decomposition import TruncatedSVD, NMF
  import matplotlib.pyplot
  import seaborn
  from data_describe.config._config import get_option
  from data_describe.text.text_preprocessing import create_doc_term_matrix, create_tfidf_matrix, filter_dictionary
  from data_describe.backends import _get_viz_backend
  from data_describe.compat import _compat, _requires, _in_notebook
  from data_describe._widget import BaseWidget
label_desc: Use image node_id 4 for calling the TopicModelWidget obj's underlying member method code with example usage: obj.model_type() and returns: self