Categorical node expects one-hot encoded vector, but doesn't check it

[bvdmitri]

The rules should check it and throw a user friendly error

[abpolym]

I will fix this

[wouterwln]

@abpolym are you still planning on fixing this? Otherwise we might be able to fix it next week during dev session (maybe you can teach a junior phd student how to fix it and we all learn?) Let me know in either case :)

[abpolym]

Yeah I forgot about this issue, lets do it during the dev session

[abpolym]

So I guess this issue now can be closed after the PR has been merged? 😄