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Which forward-chaining engine do you use? Something based on prolog?

Currently https://github.com/nilp0inter/experta but https://github.com/noxdafox/clipspy seems nice, I just shied away from using it due to uneasiness about FFI and debugging, even though the original CLIPS is still awesome and has a very interesting manual.

There's also https://github.com/jruizgit/rules but haven't tried it yet.

Interesting. I guess your driving factor was that you can use those directly from Python. How's the performance (with many many rules)?

Yes exactly, I want to be able to do rich auditing of the predictions. Not sure about performance yet, still prototyping!