Can't run simple JuMP example

I am learning the basics of JuMP and tried running the code below, which computes the MLE of the parameters of a Gaussian distribution (mean and variance, source):

using JuMP, Ipopt, Random, Statistics


n = 1_000
data = randn(n)

mle = Model(optimizer_with_attributes(Ipopt.Optimizer, "print_level" => 0))
@NLparameter(mle, problem_data[i = 1:n] == data[i])

μ0 = randn()
σ0 = rand() + 1
@info "Starting guess, mean: $μ0, std: $σ0"

@variable(mle, μ, start = μ0)
@variable(mle, σ >= 0.0, start = σ0)

@NLexpression(mle, loglikelihood,
    -(n / 2) * (log(2π) + 2 * log(σ)) - inv(2 * σ^2) * sum((xi - μ)^2 for xi in problem_data)

@NLobjective(mle, Max, loglikelihood)


It gives me the following error, however:

The terminal process "C:\Users\dan\AppData\Local\Programs\Julia-1.6.2\bin\julia.exe '-i', '--banner=no', '--project=C:\Users\dan\.julia\environments\v1.6', 'c:\Users\dan\.vscode\extensions\julialang.language-julia-1.4.0\scripts\terminalserver\terminalserver.jl', '\\.\pipe\vsc-jl-repl-96af58fe-00fa-44a6-a1c9-b3f2a023a715', '\\.\pipe\vsc-jl-cr-a2d7320e-3e0e-4bb4-8651-8e0b2284c0d8', 'USE_REVISE=true', 'USE_PLOTPANE=true', 'USE_PROGRESS=true', 'DEBUG_MODE=false'" terminated with exit code: 3221226356.

Any ideas how to fix this? Thanks!

Hi @Dan.phi,

How were you running this? This looks like an error with vs-code.

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Yes, vs code

I guess to clarify: how in VS-Code? Is your language-julia extension up-to-date?

Yes, I have Julia 1.6.2 and the Julia extension is 1.4.0.

I run it in Julia directly and it essentially closed when I hit optimize!(mle), so most likely it is not a VS Code-related issue

The example runs in Juno with Julia 1.6.2 no problem:
Extrapolating from here: c++ - The terminal process terminated with exit code: 3221226356 - Stack Overflow it seems that your vs code is looking for things in the wrong places.

No idea how to fix it, though.

I run it in Julia directly

From the command line REPL?

What is import Pkg; Pkg.status() and versioninfo()?

Yes, from the REPL. Also:

Please update to Ipopt.jl 0.7.0. The 0.6.3 release is more than a year old, and I’ve fixed a number of problems like this in it.

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It worked!! Thank you very much!!!

1 Like