---
title: Retriever Modes | Developer Documentation
---

Here we show the mapping from `retriever_mode` configuration to the selected retriever class.

> Note that `retriever_mode` can mean different thing for different index classes.

## Vector Index

Specifying `retriever_mode` has no effect (silently ignored). `vector_index.as_retriever(...)` always returns a VectorIndexRetriever.

## Summary Index

- `default`: SummaryIndexRetriever
- `embedding`: SummaryIndexEmbeddingRetriever
- `llm`: SummaryIndexLLMRetriever

## Tree Index

- `select_leaf`: TreeSelectLeafRetriever
- `select_leaf_embedding`: TreeSelectLeafEmbeddingRetriever
- `all_leaf`: TreeAllLeafRetriever
- `root`: TreeRootRetriever

## Keyword Table Index

- `default`: KeywordTableGPTRetriever
- `simple`: KeywordTableSimpleRetriever
- `rake`: KeywordTableRAKERetriever

## Knowledge Graph Index

- `keyword`: KGTableRetriever
- `embedding`: KGTableRetriever
- `hybrid`: KGTableRetriever

## Document Summary Index

- `llm`: DocumentSummaryIndexLLMRetriever
- `embedding`: DocumentSummaryIndexEmbeddingRetrievers