Function is_naive

dnn/src/fallback/convolution/algos.h:167–167

    ncb_kern_t dispatch_kern(
            ConvolutionBackwardDataImpl*, const NCBKernSizeParam&) const override;
    bool is_naive() const override { return true; }
    AlgoAttribute attribute() const override {
        return AlgoAttribute::REPRODUCIBLE | AlgoAttribute::NAIVE;
    }