Fiddling with the coloring

[gdalle]

Continuing the conversation in #275 on coloring improvements, here is something else you can try to see if it makes a difference in sparse autodiff efficiency:

using StableRNGs
# try the best of several orders
coloring_algorithm = GreedyColoringAlgorithm((
    NaturalOrder(),
    LargestFirst(),
    SmallestLast(),
    IncidenceDegree(),
    DynamicLargestFirst(),
    RandomOrder(StableRNG(0), 0)
))

Efficiency can be judged by

ncolors(hess_prep)