Router Query Engine

class llama_index.query_engine.router_query_engine.RetrieverRouterQueryEngine(retriever: BaseRetriever, node_to_query_engine_fn: Callable, callback_manager: Optional[CallbackManager] = None)

Retriever-based router query engine.

NOTE: this is deprecated, please use our new ToolRetrieverRouterQueryEngine

Use a retriever to select a set of Nodes. Each node will be converted into a ToolMetadata object, and also used to retrieve a query engine, to form a QueryEngineTool.

NOTE: this is a beta feature. We are figuring out the right interface between the retriever and query engine.

Parameters

  • 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.

  • callback_manager (Optional[CallbackManager]) – A callback manager.

class llama_index.query_engine.router_query_engine.RouterQueryEngine(selector: BaseSelector, query_engine_tools: Sequence[QueryEngineTool], service_context: Optional[ServiceContext] = None, summarizer: Optional[TreeSummarize] = None)

Router query engine.

Selects one out of several candidate query engines to execute a query.

Parameters

  • 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.

  • service_context (Optional[ServiceContext]) – A service context.

  • summarizer (Optional[TreeSummarize]) – Tree summarizer to summarize sub-results.

class llama_index.query_engine.router_query_engine.ToolRetrieverRouterQueryEngine(retriever: ObjectRetriever[QueryEngineTool], service_context: Optional[ServiceContext] = None, summarizer: Optional[TreeSummarize] = None)

Tool Retriever router query engine.

Selects a set of candidate query engines to execute a query.

Parameters

  • retriever (ObjectRetriever) – A retriever that retrieves a set of query engine tools.

  • service_context (Optional[ServiceContext]) – A service context.

  • summarizer (Optional[TreeSummarize]) – Tree summarizer to summarize sub-results.