Update app.py

app.py

@@ -3,6 +3,28 @@ Gradio interface for WAN-VACE video generation
 """
 import gradio as gr
 import torch
+
+# -----------------------------------------------------------------------------
+# XPU shim for CPU‑only environments
+#
+# `diffusers` attempts to access `torch.xpu.empty_cache()` when cleaning up
+# device memory. On CPU‑only builds of PyTorch (or builds without Intel
+# extension support), the `xpu` attribute does not exist on the `torch`
+# module. Defining a dummy `torch.xpu` prevents AttributeError during
+# import.
+# -----------------------------------------------------------------------------
+if not hasattr(torch, "xpu"):
+    class _DummyXPU:
+        @staticmethod
+        def empty_cache() -> None:
+            return None
+        @staticmethod
+        def is_available() -> bool:
+            return False
+        @staticmethod
+        def device_count() -> int:
+            return 0
+    torch.xpu = _DummyXPU()  # type: ignore[attr-defined]
 import time
 from typing import Optional