fix not working cgpt

app.py

@@ -173,7 +173,7 @@ def app():
                             conversational_qa_chain,
                             {
                                 "question": prompts2,
-                                "chat_history": chistory,
+                                "chat_history": "\n".join([f"{msg['role']}: {msg['content']}" for msg in chistory])
                             },
                             num_responses=5
                         )
@@ -196,10 +196,18 @@ def generate_multiple_responses(chain, inputs, num_responses=5):
 def rerank_responses(reranker, responses):
     scores = []
     for response in responses:
-        score = reranker.invoke({"input": response})
+        score = reranker.invoke(response)
         scores.append(score)
     best_response_idx = scores.index(max(scores))
     return responses[best_response_idx]
 
+def stream_conversational_qa_chain(chain, inputs):
+    try:
+        response = chain.invoke(inputs)
+        for part in response:
+            yield part
+    except Exception as e:
+        raise e
+
 if __name__ == '__main__':
     app()