Update app.py

app.py

@@ -52,10 +52,12 @@ def display_chat_history(chain):
 def create_conversational_chain(vector_store):
     load_dotenv()
     llm = Replicate(
-        streaming=True,
-        model="replicate/llama-2-70b-chat:58d078176e02c219e11eb4da5a02a7830a283b14cf8f94537af893ccff5ee781",
-        callbacks=[StreamingStdOutCallbackHandler()],
-        input={"temperature": 0.01, "max_length": 500, "top_p": 1})
+    streaming=True,
+    model="replicate/llama-2-70b-chat:58d078176e02c219e11eb4da5a02a7830a283b14cf8f94537af893ccff5ee781",
+    replicate_api_token="r8_AA3K1fhDykqLa5M74E5V0w5ss1z0P9S3foWJl",  
+    callbacks=[StreamingStdOutCallbackHandler()],
+    input={"temperature": 0.01, "max_length": 500, "top_p": 1}
+)
     memory = ConversationBufferMemory(memory_key="chat_history", return_messages=True)
 
     chain = ConversationalRetrievalChain.from_llm(llm=llm, chain_type='stuff',