(self,data_set)
return hit times  value of given data set
        :param data_set:
        :return:
return hit times  value of given data set
        :param data_set:
        :return:
return hit times value of given data set : param data_set : : return :
def get_hit(self,data_set):
        '''
        return hit times  value of given data set
        :param data_set:
        :return:
        '''
        pass
def get_hit ( self , data_set ) : pass