'Compute the extraneous material in the hypothesis.
:param toktype: distinguish Named Entities from ordinary words
:type toktype: \'ne\' or \'word\''

def hyp_extra(self, toktype, debug=True):

    ne_extra = set((token for token in self._hyp_extra if ne(token)))
    if (toktype == 'ne'):
        return ne_extra
    elif (toktype == 'word'):
        return (self._hyp_extra - ne_extra)
    else:
        raise ValueError(("Type    not    recognized:    '%s'" % toktype))
