Update chat_engine.py

chat_engine.py

@@ -92,13 +92,15 @@ def get_chat_engine(files, progress=gr.Progress()):
 
     documents = SimpleDirectoryReader(input_files=files).load_data()
   
-    sentence_node_parser = SentenceWindowNodeParser.from_defaults(
-            window_size=1,
-            window_metadata_key="window",
-            original_text_metadata_key="original_text")
+
+    splitter = TokenTextSplitter(
+        chunk_size=1024,
+        chunk_overlap=20,
+        separator=" ",
+    )
 
     progress(0.3, desc="Creating index...")
-    nodes = sentence_node_parser.get_nodes_from_documents(documents)
+    nodes = splitter.get_nodes_from_documents(documents)
     index = VectorStoreIndex(nodes)
 
     chat_text_qa_msgs = [