ZeroDivisionError: float division by zero

[hamidhaghdoost]

Hi, I have following error when I want to train_batch() my model

ZeroDivisionError                         Traceback (most recent call last)
<ipython-input-13-a2ffe646197f> in <module>
     10 
     11 model.train_batch(max_epochs=1000, 
---> 12                  max_iterations_first=1
     13                  )

~/anaconda3/lib/python3.7/site-packages/flatcat/flatcat.py in train_batch(self, min_iteration_cost_gain, min_epoch_cost_gain, max_epochs, max_iterations_first, max_iterations, max_resegment_iterations, max_shift_distance, min_shift_remainder)
    861         msg = 'Must initialize model and tag corpus before training'
    862         assert self._corpus_tagging_level == "full", msg
--> 863         self._epoch_update(no_increment=True)
    864         previous_cost = self.get_cost()
    865         wl_force_another = False

~/anaconda3/lib/python3.7/site-packages/flatcat/flatcat.py in _epoch_update(self, no_increment)
   1650             _logger.info('Cost balance (W Corp / W Anno): {}'.format(
   1651                 self._corpus_coding.get_cost() /
-> 1652                 self._annot_coding.get_cost()))
   1653 
   1654         self._operation_number = 0

ZeroDivisionError: float division by zero