Update app.py

app.py

@@ -35,7 +35,7 @@ def create_memory():
 def pdf_qa(query, memory):
     function = ConversationalRetrievalChain.from_llm(
         llm=llm,
-        retriever=vectordb.as_retriever(search_kwargs={'k': 24}),
+        retriever=vectordb.as_retriever(search_kwargs={'k': 28}),
         combine_docs_chain_kwargs={'prompt': qa_prompt},
         memory=memory
     )