Jacobians

[willtebbutt]

Sometimes you actually do want the jacobian of a function. If this function is a vector->vector function, the Jacobian is a matrix. It's not immediately obvious how to define the jacobian for, say, a function that accepts a struct and returns a struct. It would be nice to figure out some sensible conventions here.

[oxinabox]

Somewhere on Zygote there was an issue about this written up by @Roger-luo
I am going to end up solving this in the next few weeks.
It will be interesting to look back at the solution I end up with and what our past thoughts were.