REFINE_PROMPT_TMPL = (

REFINE_PROMPT_TMPL = (
"原始查询如下: {query_str}\n"
"我们已经提供了一个现有的答案: {existing_answer}\n"
"我们有机会用下面的更多上下文来改进现有的答案(仅在需要时)。\n"
"------------\n"
"{context_msg}\n"
"------------\n"
"给定新的上下文，改进原始答案以更好地回答查询。"
"如果上下文没有用，则返回原始答案。\n"
"改进后的答案: "
)
REFINE_PROMPT = PromptTemplate(REFINE_PROMPT_TMPL)

query_engine = index.as_query_engine(
sub_retrievers=[
llm_synonym,
vector_context,
],
llm=CustomLLM(),
refine_template=REFINE_PROMPT
)


In the above code, refine_template is not in effect, how can I fix this? Can someone take a look at this for me? Thanks