Update app.py

app.py

@@ -3,8 +3,6 @@ from langchain_anthropic import ChatAnthropic
 from langchain.prompts import ChatPromptTemplate, MessagesPlaceholder
 from langchain.schema import StrOutputParser
 from langchain.schema.runnable import Runnable
-from langchain.schema.runnable import Runnable, RunnablePassthrough, RunnableLambda
-from langchain.schema.runnable.config import RunnableConfig
 from langchain_pinecone import PineconeVectorStore
 from langchain_huggingface import HuggingFaceEmbeddings
 from langchain_community.chat_message_histories import ChatMessageHistory