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Speculative RAG By Google Research
๐ Abstract
The article discusses retrieval augmented generation (RAG), which combines the generative abilities of large language models (LLMs) with external knowledge sources to provide more accurate and up-to-date responses. It covers different approaches to RAG, including:
- Standard RAG: Incorporates all documents into the prompt, with variations using summarization, re-ranking, and user feedback.
- Self-Reflective RAG: Requires specialized instruction-tuning of the language model to generate specific tags for self-reflection.
- Corrective RAG: Uses an external retrieval evaluator to refine document quality, focusing on contextual information without enhancing reasoning capabilities.
- Speculative RAG: Leverages a larger generalist LM to efficiently verify multiple RAG drafts produced in parallel by a smaller, specialized LM, each based on a distinct subset of retrieved documents.
๐ Q&A
[01] Speculative RAG
1. What is the key idea behind Speculative RAG?
- Speculative RAG uses a smaller specialist RAG drafter to generate high-quality draft answers, with each draft coming from a distinct subset of retrieved documents.
- The larger generalist language model verifies and integrates the most promising draft into the final answer, enhancing comprehension of each subset and mitigating the lost-in-the-middle phenomenon.
- This method significantly accelerates the RAG process by having the smaller specialist LM handle drafting, while the larger generalist LM performs a single, unbiased verification pass over the drafts in parallel.
2. What are the benefits of Speculative RAG?
- Speculative RAG achieves state-of-the-art performance with reduced latency.
- It improves accuracy by up to 12.97% and reduces latency by 51% compared to traditional RAG systems.
[02] Other RAG Approaches
1. What are the key characteristics of the other RAG approaches mentioned?
- Standard RAG: Incorporates all documents into the prompt, with variations using summarization, re-ranking, and user feedback.
- Self-Reflective RAG: Requires specialized instruction-tuning of the language model to generate specific tags for self-reflection.
- Corrective RAG: Uses an external retrieval evaluator to refine document quality, focusing on contextual information without enhancing reasoning capabilities.
Shared by Daniel Chen ยท
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