Update app.py

app.py

@@ -14,9 +14,7 @@ from langchain.chains.llm import LLMChain
 from langchain.chains.combine_documents.stuff import StuffDocumentsChain
 from langchain.chat_models import ChatOpenAI
 from langchain.chains import RetrievalQA
-from langchain_core.retrievers import BaseRetriever
-from langchain_core.callbacks import CallbackManagerForRetrieverRun
-from langchain.schema.document import Document
+
 
 #Carga de DATASET
 dataset_name = "Waflon/FAQ"