Class UniformIntNonZeroRNG

dnn/test/common/rng.h:141–150

range must be positive; each value would be negated with prob 0.5

//! range must be positive; each value would be negated with prob 0.5
class UniformIntNonZeroRNG : public UniformIntRNG {
    std::uniform_int_distribution<dt_int32> m_dist_flip{0, 1};

public:
    UniformIntNonZeroRNG(int a, int b) : UniformIntRNG(a, b) {
        megdnn_assert(a > 0 && b > a);
    }

    dt_float32 gen_single_val() override;
};

class UniformFloatRNG : public IIDRNG {
public: