[nschucher]

This is called federated learning[0] at least by Google. I don't know whether they've added this to more products or whether it works well. It would be interesting to see this done in open source.

[0] https://ai.googleblog.com/2017/04/federated-learning-collabo...

[ClassAndBurn]

Thank you! I was trying to find that before posting but forgot their naming of it.