ComfyUI enable intel xpu by mistake.

[ISDHN]

Expected Behavior

I dont install ipex in my computer, thus intel xpu should not be enabled.

Actual Behavior

In comfy\model_management.py, the initial value of xpu_available is:

xpu_available = int(torch_version[0]) < 2 or (int(torch_version[0]) == 2 and int(torch_version[2]) <= 4)  # the result is true

So, in the step where the installation of ipex is checked:

try:
    import intel_extension_for_pytorch as ipex
    _ = torch.xpu.device_count()
    xpu_available = torch.xpu.is_available()
except:
    xpu_available = xpu_available or (hasattr(torch, "xpu") and torch.xpu.is_available())

If ipex is not install, code will go into the except block. In this way, the xpu_available will be true, leading to access of torch.xpu.current_device(), and cause the code to crash

Steps to Reproduce

just start comfyui without ipex

Debug Logs

Traceback (most recent call last):
  File "E:\AI\ImageGenerate\ComfyUI\main.py", line 86, in <module>
    import execution
  File "E:\AI\ImageGenerate\ComfyUI\execution.py", line 13, in <module>
    import nodes
  File "E:\AI\ImageGenerate\ComfyUI\nodes.py", line 21, in <module>
    import comfy.diffusers_load
  File "E:\AI\ImageGenerate\ComfyUI\comfy\diffusers_load.py", line 3, in <module>
    import comfy.sd
  File "E:\AI\ImageGenerate\ComfyUI\comfy\sd.py", line 5, in <module>
    from comfy import model_management
  File "E:\AI\ImageGenerate\ComfyUI\comfy\model_management.py", line 139, in <module>
    total_vram = get_total_memory(get_torch_device()) / (1024 * 1024)
  File "E:\AI\ImageGenerate\ComfyUI\comfy\model_management.py", line 106, in get_torch_device
    return torch.device("xpu", torch.xpu.current_device())
  File "C:\Program Files\Python310\lib\site-packages\torch\__init__.py", line 1833, in __getattr__
    raise AttributeError(f"module '{__name__}' has no attribute '{name}'")
AttributeError: module 'torch' has no attribute 'xpu'

Other

No response