Method expect

test/model/MobileNetTest.cpp:137–139

        return this->path() + "/flt_input.txt";
    }
    virtual std::string expect() override {
        return this->path() + "/v1/expect.txt";
    }
    virtual MNN::Tensor::DimensionType dimensionType() override {
        return MNN::Tensor::CAFFE;
    }