tl;dr 1. The objective of this paper is to show how the complex-step derivative approximation is related to algorithmic differentiation. 2. For a tutorial on

tl;dr 1. The objective of this paper is to show how the complex-step derivative approximation is related to algorithmic differentiation. 2. For a tutorial on complex-step differentiation, I can recommend the blog post of John Lapeyre: http://www.johnlapeyre.com/posts/complex-step-differentiation/ http://www.johnlapeyre.com/posts/complex-step-differentiatio...