The research is still ongoing, although perhaps lower-profile than what appears in the press. RETRO did get press, but it was not the first retrieval model, an

The research is still ongoing, although perhaps lower-profile than what appears in the press. RETRO did get press, but it was not the first retrieval model, and in fact was not SOTA when it got published; FiD was, which later evolved into Atlas[0], published a few months ago. [0]: https://github.com/facebookresearch/atlas https://github.com/facebookresearch/atlas