The inf1/inf2 spot instances are so unpopular that they cost less than the equivalent cpu instances. Exact same (or better) hardware but 10-20% cheaper.
We're not quite seeing that on the trn1 instances yet, so someone is using them.
Heh, I was looking at an eks cluster recently that was using Cast AI autoscalar. Scratching my head as there was a bunch of inf instances. Then I realized it must be cheap spot pricing.
kcb|2 months ago