Deduplicate ipex initialization code

library/ipex_interop.py

@@ -0,0 +1,24 @@
+import torch
+
+
+def init_ipex():
+    """
+    Try to import `intel_extension_for_pytorch`, and apply
+    the hijacks using `library.ipex.ipex_init`.
+
+    If IPEX is not installed, this function does nothing.
+    """
+    try:
+        import intel_extension_for_pytorch as ipex  # noqa
+    except ImportError:
+        return
+
+    try:
+        from library.ipex import ipex_init
+
+        if torch.xpu.is_available():
+            is_initialized, error_message = ipex_init()
+            if not is_initialized:
+                print("failed to initialize ipex:", error_message)
+    except Exception as e:
+        print("failed to initialize ipex:", e)