Update app.py

added source nodes

app.py

@@ -116,7 +116,7 @@ retriever = DocumentSummaryIndexEmbeddingRetriever(
 # set up retriever
 retriever = VectorIndexRetriever(
     index = index,
-    similarity_top_k = 10,
+    similarity_top_k = 15,
     #vector_store_query_mode="mmr",
     #vector_store_kwargs={"mmr_threshold": 0.4}
 )
@@ -198,8 +198,11 @@ with gr.Blocks() as demo:
     def bot(history):
         user_message = history[-1][0]
         #bot_message = chat_engine.chat(user_message)
+        source_nodes = ""
         bot_message = query_engine.query(user_message + "Let's think step by step to get the correct answer. If you cannot provide an answer, say you don't know.")
-        source_nodes = bot_message.source_nodes
+        source_nodes_list = bot_message.source_nodes
+        for nodes in source_nodes_list:
+            source_nodes = source_nodes + nodes + "\n\n"
         final_response = bot_message.response + "\n Source nodes: \n" + source_nodes
         history[-1][1] = ""
         for character in final_response: