I was just looking at inference, meaning you need some separate infra to do the training either way. If the DB does the training too, then yeah. I think we're pretty far from that, and Postgres by itself might not be the platform for it. There are platforms with SQL-like interfaces that use databases underneath, but there's a lot happening on top.

I think it is all few months work project, given you can run any arbitrary py/c code in extension in postgres, so it is a matter of data wrangling: convert pg table to recordio, run train/inference, convert results back to pg table, wrap logic into pg/py or pg/c functions.

Postgresml.org extension can do training. End to end ml workflows within postgres... Posting this as a happy user.