tokens: The best you can do is choose a precision ( either float or double ) that is big enough so that the extra error digits will not make any difference to your solution , and then chop them off when you display the number .
ner_tags: O O O O O O O O O O O B-Data_Type O B-Data_Type O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O