Function is_int4

dnn/src/fallback/relayout/opr_impl.cpp:120–123

}

bool is_int4(const TensorLayout& layout) {
    return layout.dtype.enumv() == DTypeEnum::QuantizedS4 ||
           layout.dtype.enumv() == DTypeEnum::Quantized4Asymm;
}

inline bool check_dtype_support_transparam(
        bool trans, bool is_bit4, const relayout::TransposeParam& param) {