Another approach I saw is to build a conceptual graph using entity extraction and have the LLM suggest search paths through that graph to enhance the retrieval step. The LMM is fine-tuned on the conceptual graph for this specific task. Could work in your case, but you need to deal with an ontology that suits your use case, in other words it must already contain restaurant location, type of dishes served and opening hours.
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Another approach I saw is to build a conceptual graph using entity extraction and have the LLM suggest search paths through that graph to enhance the retrieval step. The LMM is fine-tuned on the conceptual graph for this specific task. Could work in your case, but you need to deal with an ontology that suits your use case, in other words it must already contain restaurant location, type of dishes served and opening hours.