Update app.py

app.py

@@ -1,4 +1,24 @@
 # -*- coding: utf-8 -*-
+import os
+import contextlib
+        
+@contextlib.contextmanager
+def new_cd(x):
+    d = os.getcwd()
+
+    # This could raise an exception, but it's probably
+    # best to let it propagate and let the caller
+    # deal with it, since they requested x
+    os.chdir(x)
+
+    try:
+        yield
+
+    finally:
+        # This could also raise an exception, but you *really*
+        # aren't equipped to figure out what went wrong if the
+        # old working directory can't be restored.
+        os.chdir(d)
 from ipex_llm.transformers import AutoModelForCausalLM
 from transformers import LlamaTokenizer