Yes, I remember. It is a very good article. The step from deterministic to stochastic Wolfe looks doable and I have my C++ code for BVN and splines as well as a pluggable component architecture (based on my 2018 book) defined by small interfaces, I used scalar functions and now it will be multivariate.I don't know if I posted this paper here already, but I think you might like it. I read it, it's a good paper and comes with a complete recipe: Probabilistic Line Searches for Stochastic Optimization
A practical issue is understanding their pseudo code and mapping it to my components. That's the plan which will now be executed.