def clear_select_fields(self):
        self.select = []
        self.values_select = []
:return: a probability distribution over sets of labels for the
dataset/ETHPy150Open django/django/django/db/models/sql/query.py/Query.clear_select_fields--crossover with--dataset/ETHPy150Open nltk/nltk/nltk/classify/api.py/MultiClassifierI.prob_classify