The name itself is confusing to begin with.
I come across reduce once in a few months, then I think it's a neat trick and a nice to have function.
then I forget it's even available and don't ever use unless these days LLM brings it up again.
I come across reduce once in a few months, then I think it's a neat trick and a nice to have function.
then I forget it's even available and don't ever use unless these days LLM brings it up again.
Maybe there's just a better way to think about it and I'm still thinking about it way too much like a programmer
You "accumulate" an answer one item at a time, but there's no guarantee any dimensions are getting reduced.
You can easily duplicate the effects of map with reduce, for example, so the dims would stay the same. You could even expand dimensions, if you like, turning a 1-d array with n elements into an s X t 2-d array. If the reducing function tracks the total number of elements seen, it can easily know when to start a new row.
This is part of why people keep pointing out the name, "reduce", is a bit misleading.