Method get_ans

dnn/src/naive/pooling/opr_impl.cpp:31–36

        fed = true;
    }
    ctype get_ans() {
        if (!fed) {
            megdnn_throw("The pooling window lies outside completely");
        }
        return answer;
    }
};

//! WARNING:for Integer, if sum ctype_ set incorrectly may cause overflow such as