PS, for context, I'm building my own picture management app with Electron so I'm interested in anything like this, it's a feature I planned to add to have a one-up but seems like no longer.
> Photos uses a number of machine learning algorithms, running privately on-device, to help curate and organize images, Live Photos, and videos. An algorithm foundational to this goal recognizes people from their visual appearance. Photos can also learn from identity information to build a private, on-device knowledge graph that identifies interesting patterns in a user’s library, such as important groups of people, frequent places, past trips, events, the last time a user took an image of a certain person, and more. The knowledge graph powers the beloved Memories feature in Photos, which creates engaging video vignettes centered around different themes in a user’s library.