What is the requirements.txt file used for? I was wondering because it seems like we (John, Kenneth, me) use conda environments for development. But I do see that requirements.txt gets updated every now and then, so I was curious if there was a use case that I was unaware of.

Reason being, there are a bunch of package imports throughout the code that aren't listed in the requirements file, but I thought I should ask about what people used it for or the reason why some packages (like numpy) are left out before I went gung-ho on adding all of them in there.