I’d like to let everyone know about an upcoming breaking change in how JuMP deals with user-defined functions. Previously, functions registered using JuMP.register were global in scope, making them complicated to deal with in a modular way. Since PR #930, JuMP.register now takes a JuMP model as the first argument, and the registration of the function will remain local to that model.
Before:
mysquare(x) = x^2
JuMP.register(:mysquare, 1, mysquare, autodiff=true)
m = Model()
@variable(m, x)
@NLobjective(m, Min, mysquare(x))
After:
mysquare(x) = x^2
m = Model()
JuMP.register(m, :mysquare, 1, mysquare, autodiff=true)
@variable(m, x)
@NLobjective(m, Min, mysquare(x))
Uses of JuMP.register without a model as the first argument will produce an error. My intention is to release this relatively soon (<1 month) in JuMP 0.16. Feedback and bug reports are welcome as always.