Hi,
This is the part that confuses me. Why are you adding this complexity layer to optimization framework, specially when this is completely non-standard way to interface with it? If you want some fancy framework for differentiation why not created a wrapper function?
I fully agree!
Why would someone think about second derivatives in optimizations using finite differences? This is not used, and not stable. If the user doesn't want to deal with implementation themselves, they can use your differentiation framework as a wrapper. Why is this forced on to the user in the optimization framework?
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