Deep generative models
December 10, 2020 — November 10, 2021
Certain famous models in neural nets are generative — informally, they produce samples from some distribution. In training, the distribution of those samples is tweaked until it resembles, in some sense, the distribution of our observed data. There are many attempts now to unify fancy generative techniques such as GANs, VAEs, and neural diffusion into a single unified method, or at least a cordial family of methods, so I had better devise a page for that.
Here I mean generative in the sense that “this model will (approximately) simulate from the true distribution of interest,” which is somewhat weaker than the requirements of, e.g., MC Bayesian inference, where we assume that we can access likelihoods, or at least likelihood gradients. In such a case, we might have no likelihood at all, or variational approximations to likelihood or whatever.
1 Philosophical diversion: probability is a weird abstraction
Tangent: Learning problems involve the composition of differentiating and integrating various terms that measure how well you have approximated the state of the world. Probabilistic neural networks leverage combinations of integrals that we can solve by Monte Carlo, and derivatives that we can solve via automatic differentiation, which are both fast-ish on modern hardware. In cunning combination, these find approximate solutions to some very interesting problems in calculus. Although… There is something odd about that setup. From this perspective, generative models (such as GANs and autoencoders) solve an intractable integral by simulating samples probabilistically from it, in lieu of processing the continuous, unknowable, intractable integral that we actually wish to solve. But that continuous intractable integral was in any case a contrivance, a thought experiment imagining a world populated with such weird Platonic objects as integrals-over-possible-states-of-the-world which only mathematicians would consider reasonable. The world we live in has, as far as I know, no such thing. We do not have a world where the things we observe are stochastic samples from an ineffable probability density, but rather the observations themselves are the phenomena, and the probability density over them is a weird abstraction. It must look deeply odd from the outside when we talk about how we are solving integrals by looking at data, instead of solving data by looking at integrals.
2 Generative flow nets
See this page.
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