Method allocate

XM/include/Utils/memory.h:1027–1035

        }

        inline void allocate(const int gpu_id, const int size) {
            if (this->vals == nullptr) {
                this->gpu_id = gpu_id;
                this->size = size;
                CHECK_CUDA( cudaSetDevice(this->gpu_id) );
                CHECK_CUDA( cudaMalloc((void**) &this->vals, sizeof(int) * this->size) );
            }
            return;
        }

        ~DeviceDnVecInt() {
            CHECK_CUDA( cudaSetDevice(this->gpu_id) );