redis is useful in usecases where people are running their apps in a Cloud Foundry instance, and redis has an open source version of their tile, but mongo doesn't. Just sharing :)

I highly doubt the bottleneck is the database. Training means text analytics means quite some processing. So i would expect the bottleneck is the computing power.

Its been a while but I really appreciate that this issue was logged. Both redis and mongodb now have various degrees of support for vector search. I'm starting to do some reading and research to learn more, but so far it seems like redis is a really prime candidate.