removed source documents

app.py

@@ -25,10 +25,10 @@ s3.download_file('rad-rag-demos', 'vectorstores/chroma.sqlite3', './chroma_db/ch
      
 db = Chroma(persist_directory="./chroma_db", embedding_function=embeddings)
 db.get()
-retriever = db.as_retriever()
+retriever = db.as_retriever(search_type = "mmr")
 
 global qa 
-qa = RetrievalQA.from_chain_type(llm=model_id, chain_type="stuff", retriever=retriever, return_source_documents=True)
+qa = RetrievalQA.from_chain_type(llm=model_id, chain_type="stuff", retriever=retriever)
 
 
 def add_text(history, text):
@@ -38,11 +38,7 @@ def add_text(history, text):
 def bot(history):
     response = infer(history[-1][0])
     history[-1][1] = response['result']
-    sources = [doc.metadata.get("source") for doc in response['source_documents']]
-    src_list = '\n'.join(sources)
-    print_this = response['result']+"\n\n\n Sources: \n\n\n"+src_list
-   # return history
-    return print_this
+    return history
 
 def infer(question):  
     query = question