[Fix] Fix AMP in Ascend and support using NPUJITCompile environment (#994)

* add npu device support

* add npu device support

mmengine/device/utils.py

 # Copyright (c) OpenMMLab. All rights reserved.
+import os
 from typing import Optional
 
 import torch
@@ -39,7 +40,8 @@ def is_npu_available() -> bool:
 
         # Enable operator support for dynamic shape and
         # binary operator support on the NPU.
-        torch.npu.set_compile_mode(jit_compile=False)
+        npu_jit_compile = bool(os.getenv('NPUJITCompile', False))
+        torch.npu.set_compile_mode(jit_compile=npu_jit_compile)
     except Exception:
         return False
     return hasattr(torch, 'npu') and torch.npu.is_available()

mmengine/runner/amp.py

@@ -126,6 +126,10 @@ def autocast(device_type: Optional[str] = None,
 
         elif device_type == 'mlu':
             pass
+
+        elif device_type == 'npu':
+            pass
+
         else:
             # Device like MPS does not support fp16 training or testing.
             # If an inappropriate device is set and fp16 is enabled, an error