code: def device(self, device_index=None):
      return torch.npu.device(device_index)
  
imports: import importlib
  import inspect
  from .abstract_accelerator import DeepSpeedAccelerator
label_desc: Use image node_id 4 for calling the NPU_Accelerator obj's underlying member method code with example usage: obj.device(device_index) and returns: torch