Josh Day

I'm curious if there's a better solution, but I put this together yesterday. My understanding is that `InteractiveUtils.subtypes` is slow, but for my use case it doesn't matter. ```julia function...

Very cool. I did look through your branch in ObjectiveFunctions, but I missed this. We should definitely include it.

Let me know if you'd like to start making changes here and I'll stop working directly with master.

> for performance reasons a collumn should denote an observation. This isn't universally better. It's great for SGD, but bad for coordinate descent. Enforcing one or the other may be...

Not sure I completely follow, but I think the pieces are there. Is `grad!(objfunc::RegularizedObjective)` missing data arguments?

@juliohm the latest LearnBase release breaks things downstream (PenaltyFunctions). Where did `prox` and similar functions go?

It's the proximal mapping/operator (https://en.wikipedia.org/wiki/Proximal_operator) Both `prox` and `prox!` are used in PenaltyFunctions. No need for a PR, but could you add them back and make a new release?

Do you have autocomplete-bibtex installed? At .source.gfm, all other autocompletions get disabled. https://github.com/apcshields/autocomplete-bibtex/issues/72

It looks like this severely stalls the precompilation of SimulationService.jl. I get a fun mix of warnings and errors. Happy to share the terminal output if it will help.