This method will discard any classifiers for labels not in the list passed in. This is intended to
allow users to discard classifers for labels they are not interested in, but
may have uninteded side effects, like GPE labels being classified as PERSON.
This method will discard any classifiers for labels not in the list passed in. This is intended to allow users to discard classifers for labels they are not interested in, but may have uninteded side effects, like GPE labels being classified as PERSON.