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248 | class RouterQueryEngine(BaseQueryEngine):
"""
Router query engine.
Selects one out of several candidate query engines to execute a query.
Args:
selector (BaseSelector): A selector that chooses one out of many options based
on each candidate's metadata and query.
query_engine_tools (Sequence[QueryEngineTool]): A sequence of candidate
query engines. They must be wrapped as tools to expose metadata to
the selector.
summarizer (Optional[TreeSummarize]): Tree summarizer to summarize sub-results.
"""
def __init__(
self,
selector: BaseSelector,
query_engine_tools: Sequence[QueryEngineTool],
llm: Optional[LLM] = None,
summarizer: Optional[TreeSummarize] = None,
verbose: bool = False,
) -> None:
self._llm = llm or Settings.llm
self._selector = selector
self._query_engines = [x.query_engine for x in query_engine_tools]
self._metadatas = [x.metadata for x in query_engine_tools]
self._summarizer = summarizer or TreeSummarize(
llm=self._llm,
summary_template=DEFAULT_TREE_SUMMARIZE_PROMPT_SEL,
)
self._verbose = verbose
super().__init__(callback_manager=Settings.callback_manager)
def _get_prompt_modules(self) -> PromptMixinType:
"""Get prompt sub-modules."""
# NOTE: don't include tools for now
return {"summarizer": self._summarizer, "selector": self._selector}
@classmethod
def from_defaults(
cls,
query_engine_tools: Sequence[QueryEngineTool],
llm: Optional[LLM] = None,
selector: Optional[BaseSelector] = None,
summarizer: Optional[TreeSummarize] = None,
select_multi: bool = False,
**kwargs: Any,
) -> "RouterQueryEngine":
llm = llm or Settings.llm
selector = selector or get_selector_from_llm(llm, is_multi=select_multi)
assert selector is not None
return cls(
selector,
query_engine_tools,
llm=llm,
summarizer=summarizer,
**kwargs,
)
def _query(self, query_bundle: QueryBundle) -> RESPONSE_TYPE:
with self.callback_manager.event(
CBEventType.QUERY, payload={EventPayload.QUERY_STR: query_bundle.query_str}
) as query_event:
result = self._selector.select(self._metadatas, query_bundle)
if len(result.inds) > 1:
responses = []
for i, engine_ind in enumerate(result.inds):
log_str = (
f"Selecting query engine {engine_ind}: " f"{result.reasons[i]}."
)
logger.info(log_str)
if self._verbose:
print_text(log_str + "\n", color="pink")
selected_query_engine = self._query_engines[engine_ind]
responses.append(selected_query_engine.query(query_bundle))
if len(responses) > 1:
final_response = combine_responses(
self._summarizer, responses, query_bundle
)
else:
final_response = responses[0]
else:
try:
selected_query_engine = self._query_engines[result.ind]
log_str = f"Selecting query engine {result.ind}: {result.reason}."
logger.info(log_str)
if self._verbose:
print_text(log_str + "\n", color="pink")
except ValueError as e:
raise ValueError("Failed to select query engine") from e
final_response = selected_query_engine.query(query_bundle)
# add selected result
final_response.metadata = final_response.metadata or {}
final_response.metadata["selector_result"] = result
query_event.on_end(payload={EventPayload.RESPONSE: final_response})
return final_response
async def _aquery(self, query_bundle: QueryBundle) -> RESPONSE_TYPE:
with self.callback_manager.event(
CBEventType.QUERY, payload={EventPayload.QUERY_STR: query_bundle.query_str}
) as query_event:
result = await self._selector.aselect(self._metadatas, query_bundle)
if len(result.inds) > 1:
tasks = []
for i, engine_ind in enumerate(result.inds):
log_str = (
f"Selecting query engine {engine_ind}: " f"{result.reasons[i]}."
)
logger.info(log_str)
if self._verbose:
print_text(log_str + "\n", color="pink")
selected_query_engine = self._query_engines[engine_ind]
tasks.append(selected_query_engine.aquery(query_bundle))
responses = run_async_tasks(tasks)
if len(responses) > 1:
final_response = await acombine_responses(
self._summarizer, responses, query_bundle
)
else:
final_response = responses[0]
else:
try:
selected_query_engine = self._query_engines[result.ind]
log_str = f"Selecting query engine {result.ind}: {result.reason}."
logger.info(log_str)
if self._verbose:
print_text(log_str + "\n", color="pink")
except ValueError as e:
raise ValueError("Failed to select query engine") from e
final_response = await selected_query_engine.aquery(query_bundle)
# add selected result
final_response.metadata = final_response.metadata or {}
final_response.metadata["selector_result"] = result
query_event.on_end(payload={EventPayload.RESPONSE: final_response})
return final_response
|
