ForwardDiff with distributed closures

forwarddiff_parallel_closure.jl

#=
Demonstrate a tagging issue with ForwardDiff when used with Distributed.
=#

using Distributed
length(ARGS) ≥ 1 ? addprocs(parse(Int64, ARGS[1])) : addprocs()

# comment this out if using global environment
@everywhere begin
    using Pkg
    Pkg.activate(Base.source_dir())
end

@everywhere begin
    using ForwardDiff, Dagger

    function do_calc(x, t)
        fetch(reduce(+, map(r -> (val=x*r.a,), t))).val
    end
end

function main()
    table = (a=[1, 1, 1, 1, 1], b=[6, 7, 8, 9, 10]);
    d = DTable(table, 2)

    deriv = ForwardDiff.derivative(x -> do_calc(x, d), 42)
    println(deriv)  # should be 5
end

main()

Manifest.toml

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