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sneakyimp So you've worked with AWS Comprehend?
Not specifically. A couple/three years ago I helped out on a ML project trying to identify problematic comments in review submissions. We used Amazon ML tools, though I don't recall which specific ones. My role mainly was helping to provide data for training/evaluation. I learned some stuff about ML by osmosis and a bit of tinkering around, but haven't really touched it since then.
We got some pretty promising results, but then the business moved in a different direction and it all got put on hold. We're now using ML for a very different purpose (more for predicting things, versus evaluating things), but I'm not closely involved, other than helping out with a few ancillary support things. I think we're using a mix of AWS tools along with some open-source libraries and such.