Retrieval-augmented generation (RAG) techniques have proven to be effectivein integrating up-to-date information, mitigating hallucinations, and enhancingresponse quality, particularly in specialized domains. While many RAGapproaches have been proposed to enhance large language models throughquery-dependent retrievals, these approaches still suffer from their compleximplementation and prolonged response times. Typically, a RAG workflow involvesmultiple processing steps, each of which can be executed in various ways. Here,we investigate existing RAG approaches and their potential combinations toidentify optimal RAG practices. Through extensive experiments, we suggestseveral strategies for deploying RAG that balance both performance andefficiency. Moreover, we demonstrate that multimodal retrieval techniques cansignificantly enhance question-answering capabilities about visual inputs andaccelerate the generation of multimodal content using a "retrieval asgeneration" strategy.
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