I once did Convex Optimization course with Stephen Boyd and it was totally amazing! I think it is still available here: https://www.edx.org/course/convex-optimi

I once did Convex Optimization course with Stephen Boyd and it was totally amazing! I think it is still available here: https://www.edx.org/course/convex-optimization https://www.edx.org/course/convex-optimization and the e-book https://web.stanford.edu/~boyd/cvxbook/ https://web.stanford.edu/~boyd/cvxbook/ is also freely available. I am quite jealous. :) Good luck with your PhD!