Update app.py

app.py

@@ -22,6 +22,15 @@ from langchain.retrievers.self_query.base import SelfQueryRetriever
 from langchain.chains.query_constructor.base import AttributeInfo
 
 
+lang_api_key = os.getenv("lang_api_key")
+
+os.environ["LANGCHAIN_TRACING_V2"] = "true"
+os.environ["LANGCHAIN_ENDPOINT"] = "https://api.langchain.plus"
+os.environ["LANGCHAIN_API_KEY"] = lang_api_key
+os.environ["LANGCHAIN_PROJECT"] = "Chat with multiple PDFs"
+
+
+
 def create_retriever_from_chroma(vectorstore_path="docs/chroma/", search_type='mmr', k=7, chunk_size=250, chunk_overlap=20):
     data_path = "data"
     model_name = "Alibaba-NLP/gte-base-en-v1.5"