I've done a triple-take on this also. For some reason I thought of differentiation in the state-space. Which is, off-course, oximoronic. Fuzzy logic-like on n-th degree???

There are nice tricks for getting differentiable discrete sampling; Gumbel Soft Max most famously.

https://casmls.github.io/general/2017/02/01/GumbelSoftmax.ht...