@bjonnh I was playing with new symbol API and I managed to befriend it with autodiff and commons math optimization. It is still very preliminary since I did not manage to make commons-math optimization safe enough, but the example from this test works fine both with simplex and gradient descent.
Pretty busy this week, but I want to give it a try
10/26/2020, 3:00 PM
I've finished an example with x-y fit. It looks really nice since it combines both autodiff and gradient descent in one place with full customization, but the design is not final. There are still things I find non-intuitive. The example is the last test in the reference above.