[IPEX] Fix torch.Generator hijack

modules/xpu_specific.py

@@ -94,11 +94,23 @@ def torch_xpu_scaled_dot_product_attention(
     return torch.reshape(result, (*N, L, Ev))
 
 
+def is_xpu_device(device: str | torch.device = None):
+    if device is None:
+        return False
+    if isinstance(device, str):
+        return device.startswith("xpu")
+    return device.type == "xpu"
+
+
 if has_xpu:
-    # W/A for https://github.com/intel/intel-extension-for-pytorch/issues/452: torch.Generator API doesn't support XPU device
-    CondFunc('torch.Generator',
-        lambda orig_func, device=None: torch.xpu.Generator(device),
-        lambda orig_func, device=None: device is not None and device.type == "xpu")
+    try:
+        # torch.Generator supports "xpu" device since 2.1
+        torch.Generator("xpu")
+    except:
+        # W/A for https://github.com/intel/intel-extension-for-pytorch/issues/452: torch.Generator API doesn't support XPU device (for IPEX < 2.1)
+        CondFunc('torch.Generator',
+            lambda orig_func, device=None: torch.xpu.Generator(device),
+            lambda orig_func, device=None: is_xpu_device(device))
 
     # W/A for some OPs that could not handle different input dtypes
     CondFunc('torch.nn.functional.layer_norm',