[npu] change device to accelerator api (#5239)

* update accelerator

* fix timer

* fix amp

* update

* fix

* update bug

* add error raise

* fix autocast

* fix set device

* remove doc accelerator

* update doc

* update doc

* update doc

* use nullcontext

* update cpu

* update null context

* change time limit for example

* udpate

* update

* update

* update

* [npu] polish accelerator code

---------

Co-authored-by: Xuanlei Zhao <xuanlei.zhao@gmail.com>
Co-authored-by: zxl <43881818+oahzxl@users.noreply.github.com>

examples/language/palm/train.py

@@ -14,12 +14,12 @@ from palm_pytorch.autoregressive_wrapper import AutoregressiveWrapper
 from torch.utils.data import DataLoader, Dataset
 
 import colossalai
+from colossalai.accelerator import get_accelerator
 from colossalai.booster import Booster
 from colossalai.booster.plugin import GeminiPlugin, LowLevelZeroPlugin, TorchDDPPlugin
 from colossalai.lazy import LazyInitContext
 from colossalai.logging import disable_existing_loggers, get_dist_logger
 from colossalai.nn import HybridAdam
-from colossalai.utils import get_current_device
 
 # constants
 
@@ -159,7 +159,11 @@ if args.distplan == "colossalai":
     logger.info(f"plugin: {plugin}")
     booster = Booster(plugin=plugin, **booster_kwargs)
 
-    ctx = LazyInitContext(default_device=get_current_device()) if args.plugin == "gemini" else nullcontext()
+    ctx = (
+        LazyInitContext(default_device=get_accelerator().get_current_device())
+        if args.plugin == "gemini"
+        else nullcontext()
+    )
 
     with ctx:
         model = PaLM(num_tokens=50304, dim=4096, depth=64)