Update app.py

app.py

@@ -78,7 +78,7 @@ def main():
     st.header("Chat with multiple PDFs :books:")
 
     
-
+    retriever = create_retriever_from_chroma(vectorstore_path="docs/chroma/", search_type='mmr', k=7, chunk_size=250, chunk_overlap=20)
     user_question = st.text_input("Ask a question about your documents:")
     if "messages" not in st.session_state:
         st.session_state["messages"] = [
@@ -89,7 +89,7 @@ def main():
         st.chat_message(msg["role"]).write(msg["content"])
     
     
-    retriever = create_retriever_from_chroma(vectorstore_path="docs/chroma/", search_type='mmr', k=7, chunk_size=250, chunk_overlap=20)
+    
  
     if user_question:
         handle_userinput(user_question,retriever)