A meta-comment, but, what is the difference between "learnings" and "lessons"? Why use the former when we have the latter?
Beyond what's noted there (contemporary business jargon), English is diffused across the globe and has many regional variations that are different than class-signalling/formal American and British usage. As we all encounter each other online, it's not always worth over-analyzing word choice when you can understand the intent.
https://www.opensourceshakespeare.org/views/plays/play_view....
From a correctness stand-point, I think a descriptionist would be satisfied with an attested usage, especially from such a source. From a style point of view, I still find myself feeling embarrassed for the author when I encounter this usage (which is my own problem).
IMO in this context it is basically shorthand for “things I learned/lessons learned while tuning LLM…,” and either would be fine. It is sort of an informal list of stuff the author learned.
In my experience (nothing special, just another native speaker) “lessons from <event>” is the more typical American (at least) English phrase. But it is sort of close to “Lessons on.” “Lessons on” would imply more refined material that is more narrowly focused on teaching. So I wonder if the author decided they just didn’t want to worry about any confusion, or the possibility that they might misuse a phrase.
;-)
But where the Swedish word sounds natural in that language, "learnings" just sounds wrong in English, even though it apparently is technically correct.