In plain words: It examines how to combine a search engine's document-finding with a language model's answer-writing, so answers can point to the sources they came from. The goal is expert-style advice backed by documents, instead of a list of links or confident guesses.
Abstract · Rethinking Search: Making Domain Experts out of Dilettantes
When experiencing an information need, users want to engage with a domain expert, but often turn to an information retrieval system, such as a search engine, instead. Classical information retrieval systems do not answer information needs directly, but instead provide references to (hopefully authoritative) answers. Successful question answering systems offer a limited corpus created on-demand by human experts, which is neither timely nor scalable. Pre-trained language models, by contrast, are capable of directly generating prose that may be responsive to an information need, but at present they are dilettantes rather than domain experts -- they do not have a true understanding of the world, they are prone to hallucinating, and crucially they are incapable of justifying their utterances by referring to supporting documents in the corpus they were trained over. This paper examines how ideas from classical information retrieval and pre-trained language models can be synthesized and evolved into systems that truly deliver on the promise of domain expert advice.
Donald Metzler, Yi Tay, Dara Bahri, Marc Najork
arXiv:2105.02274 · cs.IR, cs.CL · submitted May 5, 2021 · updated Jul 21, 2021
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Nowadays, if you have a question, you may get a bunch of competing opinions and often a Wikipedia article. The Wikipedia article, if it's not a topic with lots of eyes and some consensus, may not be particularly reliable. (Of course many people don't think of this.) I think this multitude of voices is closer to how the world and knowledge actually works. There is effort and interpretation involved.
On the other had, a question answering system is more like a short paper encyclopaedia article, except probably is less reliable (no detailed expert supervision) and appears more authoritative (Google is more ingrained into most peoples' lives than encyclopaedias ever were). This may appeal to people that would like internet to always give people the one "correct" answer, but not to me.