NPU use AIO-3399C(AI) has a built-in GTI 2801S NPU module. Note: To use the NPU function, please purchase the AIO-3399C(AI) hardware version with SPR2801S chip attached Instructions For how to use the AI module, please refer to NCC S1 related documents. **Note: The AI module device node is "/dev/sgX", usually "/dev/sg0". **