code: def device_name(self, device_index=None):
      if device_index == None:
          return "cuda"
      return "cuda:{}".format(device_index)
  
imports: from deepspeed.accelerator.abstract_accelerator import DeepSpeedAccelerator
  import torch.cuda
label_desc: Use image node_id 2 for calling the CUDA_Accelerator obj's underlying member method code with example usage: obj.device_name(device_index) and returns: str, str