[pixelpoet]

It seems they have some ML stuff in there for specific features, e.g. sky / land light balance and hot pixel removal (probably similar to how denoising for MC path tracing works).

Aside: randomly recognised Ryan Geiss in the credits, he did the Milkdrop plugin for Winamp back in the day, and also some cool tech demos for Nvidia...

[mirsadm]

There's no machine learning involved for hot pixel removal. The way I have heard it described is that hot pixels stay in the same place across multiple images. One of the processing steps is to figure out the location of the hot pixels by looking at multiple frames. Stars will shift slightly in between the longer exposures where as hot pixels will not.