Retriever Modules

We are actively adding more tailored retrieval guides. In the meanwhile, please take a look at the API References.

Index Retrievers

Please see the retriever modes for more details on how to get a retriever from any given index.

If you want to import the corresponding retrievers directly, please check out our API reference.

Comprehensive Retriever Guides

Check out our comprehensive guides on various retriever modules, many of which cover advanced concepts (auto-retrieval, routing, ensembling, and more).

Advanced Retrieval and Search

These guides contain advanced retrieval techniques. Some are common like keyword/hybrid search, reranking, and more. Some are specific to LLM + RAG pipelines, like small-to-big and auto-merging retrieval.

• Define Custom Retriever
• BM25 Hybrid Retriever
• Simple Fusion Retriever
• Reciprocal Rerank Fusion Retriever
• Auto Merging Retriever
• Metadata Replacement + Node Sentence Window
• Composable Objects

Auto-Retrieval

These retrieval techniques perform semi-structured queries, combining semantic search with structured filtering.

• A Simple to Advanced Guide with Auto-Retrieval (with Pinecone + Arize Phoenix)
• Auto-Retrieval (with Lantern)
• Auto-Retrieval (with Chroma)
• Auto-Retrieval (with BagelDB)
• Structured Hierarchical Retrieval
• Auto-Retrieval from a Vectara Index

Knowledge Graph Retrievers

• Custom Retriever (KG Index and Vector Store Index)
• Knowledge Graph RAG Retriever

Composed Retrievers

These are retrieval techniques that are composed on top of other retrieval techniques - providing higher-level capabilities like hierarchical retrieval and query decomposition.

• Recursive Retriever + Query Engine Demo
• Recursive Retriever + Node References
• Recursive Retriever + Node References + Braintrust
• Router Retriever
• Ensemble Retrieval Guide
• Google Generative Language Semantic Retriever
• Structured Hierarchical Retrieval

Managed Retrievers

• Google Generative Language Semantic Retriever
• Vectara Managed Index
• Managed Index with Zilliz Cloud Pipelines

Other Retrievers

These are guides that don’t fit neatly into a category but should be highlighted regardless.

• Chunk + Document Hybrid Retrieval with Long-Context Embeddings (Together.ai)
• You.com Retriever
• Text-to-SQL Guide (Query Engine + Retriever)
• DeepMemory (Activeloop)
• Pathway Retriever