def use_neutral_categories(self):
		'''
		Returns
		-------
		PriorFactory
		'''
		term_df = self.term_ranker.get_ranks()
		self.priors += term_df[[c + ' freq' for c in self._get_neutral_categories()]].sum(axis=1)
		return self
def use_neutral_categories ( self ) : term_df = self . term_ranker . get_ranks ( ) self . priors += term_df [ [ c + ' freq' for c in self . _get_neutral_categories ( ) ] ] . sum ( axis = 1 ) return self
Returns
		-------
		PriorFactory