Модель не обучается

[MihDyachkov]

Добрый день.
У меня не обучается модель на стандартных параметрах. Одинаковый результат как на питоне 2.7 так и на 3.6
Ссылка на ноутбук на GitHub (пример использования Вашей библиотеки)

Попробовал написать Вам на почту, но ответа не получил.

TypeError                                 Traceback (most recent call last)
C:\Users\mihdy_000\Anaconda3\lib\site-packages\IPython\core\formatters.py in __call__(self, obj)
    670                 type_pprinters=self.type_printers,
    671                 deferred_pprinters=self.deferred_printers)
--> 672             printer.pretty(obj)
    673             printer.flush()
    674             return stream.getvalue()

C:\Users\mihdy_000\Anaconda3\lib\site-packages\IPython\lib\pretty.py in pretty(self, obj)
    381                             if callable(meth):
    382                                 return meth(obj, self, cycle)
--> 383             return _default_pprint(obj, self, cycle)
    384         finally:
    385             self.end_group()

C:\Users\mihdy_000\Anaconda3\lib\site-packages\IPython\lib\pretty.py in _default_pprint(obj, p, cycle)
    501     if _safe_getattr(klass, '__repr__', None) not in _baseclass_reprs:
    502         # A user-provided repr. Find newlines and replace them with p.break_()
--> 503         _repr_pprint(obj, p, cycle)
    504         return
    505     p.begin_group(1, '<')

C:\Users\mihdy_000\Anaconda3\lib\site-packages\IPython\lib\pretty.py in _repr_pprint(obj, p, cycle)
    699     """A pprint that just redirects to the normal repr function."""
    700     # Find newlines and replace them with p.break_()
--> 701     output = repr(obj)
    702     for idx,output_line in enumerate(output.splitlines()):
    703         if idx:

C:\Users\mihdy_000\Anaconda3\lib\site-packages\gmdhpy\gmdh.py in __repr__(self)
    454         s += 'Test data size: {0}\n'.format(self.n_test)
    455         s += 'Selected features by index: {0}\n'.format(self.get_selected_features())
--> 456         s += 'Selected features by name: {0}\n'.format(self.get_selected_n_features_names())
    457         s += 'Unselected features by index: {0}\n'.format(self.get_unselected_features())
    458         s += 'Unselected features by name: {0}\n'.format(self.get_unselected_n_features_names())

C:\Users\mihdy_000\Anaconda3\lib\site-packages\gmdhpy\gmdh.py in get_selected_n_features_names(self)
   1103         string
   1104         """
-> 1105         return self._get_n_features_names(self.get_selected_features())
   1106 
   1107 

C:\Users\mihdy_000\Anaconda3\lib\site-packages\gmdhpy\gmdh.py in _get_n_features_names(self, features_set)
   1060         s = ''
   1061         for n, index in enumerate(features_set):
-> 1062             if len(self.feature_names) > 0:
   1063                 s += '{0}'.format(self.feature_names[index])
   1064                 if n < len(features_set)-1:

TypeError: object of type 'NoneType' has no len()