For example: https://en.wikipedia.org/wiki/%2750s_progression

Instead, it is likely a component that powers ByteDance's commercial recommender system solution, which they market to e-commerce companies: https://www.byteplus.com/en/product/recommend

This was mentioned in past discussions of the paper on HN.

And even if aspects of this are used for TikTok: (a) it would be just one of many components of their recommendation system, and (b) the TikTok recommendation system has changed a lot during the 2+ years since this has been published.

So take what you see here with a grain of salt. After reading the paper and the code, you will NOT know how TikTok's recommendations work.

Like most problems in IT in general :-)

That said, the most interesting lessons are in the first and sixth (the 2nd 6th, the actual 6th) item: How to do a better/more widely scoped job than what you got hired for (by understanding how interests, incentives and responsibilities align in an org) and the fact that in most places, most people are not serious (meaning they tend to not go deeper, look at the big picture, etc.).

Thank you for sharing it, Adam!

I am somewhat surprised that a programmer who was unaware of arrays in Perl managed to have tests. But then again, he managed to implement their own version of arrays, maybe he came up with the concept of software testing by himself :-P

Many countries manage to have (mostly) courteous and effective professional police forces without using an insurance/private lawsuit based framework such as the one you suggest.

Yes, if you are male. Different story for women who give birth.