## Environment
```
torch        2.7.1
torch_npu    2.7.1rc1
deepspeed    0.17.3
```
## Issue
An `AttributeError` is raised when `init_process_group` on NPU device
since deepspeed v0.17.3.
The issue is similar to
deepspeedai#7488.

Trace:
```
Traceback (most recent call last):
  File "/home/welsper/.local/lib/python3.10/site-packages/swift/cli/sft.py", line 10, in <module>
    sft_main()
  File "/home/welsper/.local/lib/python3.10/site-packages/swift/llm/train/sft.py", line 331, in sft_main
    return SwiftSft(args).main()
  File "/home/welsper/.local/lib/python3.10/site-packages/swift/llm/train/sft.py", line 27, in __init__
    super().__init__(args)
  File "/home/welsper/.local/lib/python3.10/site-packages/swift/llm/base.py", line 19, in __init__
    self.args = self._parse_args(args)
  File "/home/welsper/.local/lib/python3.10/site-packages/swift/llm/base.py", line 31, in _parse_args
    args, remaining_argv = parse_args(self.args_class, args)
  File "/home/welsper/.local/lib/python3.10/site-packages/swift/utils/utils.py", line 152, in parse_args
    args, remaining_args = parser.parse_args_into_dataclasses(argv, return_remaining_strings=True)
  File "/home/welsper/.local/lib/python3.10/site-packages/transformers/hf_argparser.py", line 358, in parse_args_into_dataclasses
    obj = dtype(**inputs)
  File "<string>", line 325, in __init__
  File "/home/welsper/.local/lib/python3.10/site-packages/swift/llm/argument/train_args.py", line 175, in __post_init__
    self.training_args = TrainerFactory.get_training_args(self)
  File "/home/welsper/.local/lib/python3.10/site-packages/swift/trainers/trainer_factory.py", line 70, in get_training_args
    return training_args_cls(**args_dict)
  File "<string>", line 167, in __init__
  File "/home/welsper/.local/lib/python3.10/site-packages/swift/trainers/arguments.py", line 152, in __post_init__
    super().__post_init__()
  File "/home/welsper/.local/lib/python3.10/site-packages/swift/trainers/arguments.py", line 133, in __post_init__
    super().__post_init__()
  File "/home/welsper/.local/lib/python3.10/site-packages/transformers/training_args.py", line 1803, in __post_init__
    self.device
  File "/home/welsper/.local/lib/python3.10/site-packages/transformers/training_args.py", line 2332, in device
    return self._setup_devices
  File "/home/welsper/.local/lib/python3.10/site-packages/transformers/utils/generic.py", line 74, in __get__
    cached = self.fget(obj)
  File "/home/welsper/.local/lib/python3.10/site-packages/transformers/training_args.py", line 2259, in _setup_devices
    self.distributed_state = PartialState(**accelerator_state_kwargs)
  File "/home/welsper/.local/lib/python3.10/site-packages/accelerate/state.py", line 216, in __init__
    dist.init_distributed(dist_backend=self.backend, auto_mpi_discovery=False, **kwargs)
  File "/home/welsper/.local/lib/python3.10/site-packages/deepspeed/comm/comm.py", line 854, in init_distributed
    cdb = TorchBackend(dist_backend, timeout, init_method, rank, world_size)
  File "/home/welsper/.local/lib/python3.10/site-packages/deepspeed/comm/torch.py", line 120, in __init__
    self.init_process_group(backend, timeout, init_method, rank, world_size)
  File "/home/welsper/.local/lib/python3.10/site-packages/deepspeed/comm/torch.py", line 163, in init_process_group
    torch.distributed.init_process_group(backend, **kwargs)
  File "/home/welsper/.local/lib/python3.10/site-packages/torch/distributed/c10d_logger.py", line 81, in wrapper
    return func(*args, **kwargs)
  File "/home/welsper/.local/lib/python3.10/site-packages/torch/distributed/c10d_logger.py", line 95, in wrapper
    func_return = func(*args, **kwargs)
  File "/home/welsper/.local/lib/python3.10/site-packages/torch/distributed/distributed_c10d.py", line 1717, in init_process_group
    default_pg, _ = _new_process_group_helper(
  File "/home/welsper/.local/lib/python3.10/site-packages/torch/distributed/distributed_c10d.py", line 1831, in _new_process_group_helper
    if device_id is not None and (device_id.index is None or device_id.type == "cpu"):
AttributeError: 'device' object has no attribute 'index'
```

## Fix
Switch `torch.npu.device(device_index)` to `torch.device('npu',
device_index)`.

Now:

https://github.com/deepspeedai/DeepSpeed/blob/d40a0f5de84cf825b4e59dec041a50a1b3106989/accelerator/npu_accelerator.py#L47-L48

After fix:
```python
 def device(self, device_index=None): 
     return torch.device('npu', device_index) 
```

Signed-off-by: welsper <[email protected]>
Co-authored-by: welsper <[email protected]>
Co-authored-by: Olatunji Ruwase <[email protected]>
Co-authored-by: Ma, Guokai <[email protected]>