# Specific Domains

**URL:** https://discourse.julialang.org/c/domain/10.md?no_subcategories=false&page=6

[Latest](https://discourse.julialang.org/latest.md) · [Categories](https://discourse.julialang.org/categories.md) · [Tags](https://discourse.julialang.org/tags.md)

**Page:** 7

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## [Oxygen.jl is faster than FastAPI, Flask and Rocket](https://discourse.julialang.org/t/oxygen-jl-is-faster-than-fastapi-flask-and-rocket/100389)

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**Author:** [@Jose\_Diaz](https://discourse.julialang.org/u/Jose_Diaz)\
**Replies:** 9\
**Last updated:** [May 12, 2026, 12:18pm UTC](https://discourse.julialang.org/t/oxygen-jl-is-faster-than-fastapi-flask-and-rocket/100389 "2026-05-12T12:18:54Z")

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Running some benchmarks ---- 1000 HTTP Requests ---- Flask Server --- 1.7611534595489502 seconds in total --- --- 0.0017611534595489502 seconds per iteration --- FastAPI Server --- 1.5010621547698975 seconds in total --…

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## [Kernel Density Estimate boundary problems](https://discourse.julialang.org/t/kernel-density-estimate-boundary-problems/115200)

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**Author:** [@vh94](https://discourse.julialang.org/u/vh94)\
**Replies:** 6\
**Last updated:** [May 11, 2026, 7:17am UTC](https://discourse.julialang.org/t/kernel-density-estimate-boundary-problems/115200 "2026-05-11T07:17:57Z")

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Hello everyone, I am currently trying to calculate probability density curves using the KernelDensity.jl package, however I ran into some issues due to the nature of my data. I am not a statistician so i will have to e…

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## [How to train dense nets several times faster than with Adam](https://discourse.julialang.org/t/how-to-train-dense-nets-several-times-faster-than-with-adam/137009)

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**Author:** [@uwestoehr](https://discourse.julialang.org/u/uwestoehr)\
**Replies:** 4\
**Last updated:** [May 8, 2026, 10:36am UTC](https://discourse.julialang.org/t/how-to-train-dense-nets-several-times-faster-than-with-adam/137009 "2026-05-08T10:36:59Z")

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I had the pleasure to give a lecture about the basics of neural nets at a university and purposely used Julia also for the practical lessons. As a side effect I wanted to explain my students how an optimizer can be deri…

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## [Plots bug - arrows & xflip?](https://discourse.julialang.org/t/plots-bug-arrows-xflip/137024)

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**Author:** [@BLI](https://discourse.julialang.org/u/BLI)\
**Replies:** 2\
**Last updated:** [May 7, 2026, 7:44pm UTC](https://discourse.julialang.org/t/plots-bug-arrows-xflip/137024 "2026-05-07T19:44:23Z")

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Consider: plot(sin; lw=2, xlim=\[0,2pi\],label="") plot!(\[(1,-0.5),(pi,0)\]; lw=2, lc=:red, arrow=arrow(:closed, :head, 2.0, 2.0), label="") providing (as expected): But if I flip the x axis, I get something “wrong”… …

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## [Tree-Structured Parzen Estimator (TPE) algorithm](https://discourse.julialang.org/t/tree-structured-parzen-estimator-tpe-algorithm/137001)

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**Author:** [@Resul.Akay](https://discourse.julialang.org/u/Resul.Akay)\
**Replies:** 1\
**Last updated:** [May 6, 2026, 8:37am UTC](https://discourse.julialang.org/t/tree-structured-parzen-estimator-tpe-algorithm/137001 "2026-05-06T08:37:49Z")

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Hello everyone, Is there any package that implements Tree-Structured Parzen Estimator (TPE) algorithm in Julia. TPE is the same algorithm behind Optuna and Hyperopt, two of the most widely used hyperparameter tuning fr…

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## [API for FB Prophet model](https://discourse.julialang.org/t/api-for-fb-prophet-model/74138)

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**Author:** [@mobar](https://discourse.julialang.org/u/mobar)\
**Replies:** 11\
**Last updated:** [May 6, 2026, 2:11am UTC](https://discourse.julialang.org/t/api-for-fb-prophet-model/74138 "2026-05-06T02:11:52Z")

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Has anyone yet created an eay-to-use API in Julia for Facebook’s prophet model with a basic “fit” and “predict” functionality? (Quick Start | Prophet) I’m simply asking because there’s a good chance someone also has al…

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## [Plots/GR & fill color of shapes?](https://discourse.julialang.org/t/plots-gr-fill-color-of-shapes/136993)

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**Author:** [@BLI](https://discourse.julialang.org/u/BLI)\
**Replies:** 0\
**Last updated:** [May 5, 2026, 4:18pm UTC](https://discourse.julialang.org/t/plots-gr-fill-color-of-shapes/136993 "2026-05-05T16:18:48Z")

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I figured it out – it was a stupidity done by Google AI Studio… for some weird reason, it had added a rectangle on top of the white rectangle… Arrrrghhhh

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## [How to contribute an optimizer to the Optimisers.jl package](https://discourse.julialang.org/t/how-to-contribute-an-optimizer-to-the-optimisers-jl-package/136975)

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**Author:** [@uwestoehr](https://discourse.julialang.org/u/uwestoehr)\
**Replies:** 0\
**Last updated:** [May 4, 2026, 4:07am UTC](https://discourse.julialang.org/t/how-to-contribute-an-optimizer-to-the-optimisers-jl-package/136975 "2026-05-04T04:07:17Z")

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Since almost 2 years I use Flux and Lux and thus the Optimisers.jl package. Since I need for scientific reasons also tests with optimizers not supported by the Optimisers.jl package, I wrote them for my own. I want now …

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## [Multi objective Markov decision processes](https://discourse.julialang.org/t/multi-objective-markov-decision-processes/111982)

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**Author:** [@slwu89](https://discourse.julialang.org/u/slwu89)\
**Replies:** 11\
**Last updated:** [May 3, 2026, 10:49am UTC](https://discourse.julialang.org/t/multi-objective-markov-decision-processes/111982 "2026-05-03T10:49:14Z")

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Hi all. If this is the wrong section, please let me know and I’ll move my question. I am curious if there is any work on multi-objective MDPs in Julia. I’m not very familiar with the MDP landscape in Julia; I perused th…

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## [Subplots and axis labels](https://discourse.julialang.org/t/subplots-and-axis-labels/136960)

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**Author:** [@bernardofpc](https://discourse.julialang.org/u/bernardofpc)\
**Replies:** 1\
**Last updated:** [May 2, 2026, 1:37pm UTC](https://discourse.julialang.org/t/subplots-and-axis-labels/136960 "2026-05-02T13:37:26Z")

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I’ve been using Plots.jl for some time, but never managed to figure out the correct way of producing a figure with subplots and axis labels. In most cases, it seems axis labels are positioned outside of the plot area, a…

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## [Gurobi fails to invoke the primal simplex method when doing column generation?](https://discourse.julialang.org/t/gurobi-fails-to-invoke-the-primal-simplex-method-when-doing-column-generation/133675)

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**Author:** [@WalterMadelim](https://discourse.julialang.org/u/WalterMadelim)\
**Replies:** 18\
**Last updated:** [April 30, 2026, 9:17pm UTC](https://discourse.julialang.org/t/gurobi-fails-to-invoke-the-primal-simplex-method-when-doing-column-generation/133675 "2026-04-30T21:17:20Z")

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I have a refreshing discovery today, based on my acquaintance Column generation · JuMP wherein, the only thing I changed was the solver (I used Gurobi instead of HiGHS). This is the master LP’s re-solving logging I acq…

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## [Speed issue for Quadratic Program](https://discourse.julialang.org/t/speed-issue-for-quadratic-program/136898)

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**Author:** [@vaibhav.u](https://discourse.julialang.org/u/vaibhav.u)\
**Replies:** 4\
**Last updated:** [April 30, 2026, 9:16pm UTC](https://discourse.julialang.org/t/speed-issue-for-quadratic-program/136898 "2026-04-30T21:16:30Z")

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I am dealing with a projection problem in a space defined by multiple linear constraints, with a problem dimension of about 1000, and I have 1000 such problems in a ‘for’ loop. I initially used the OSQP solver with JuMP,…

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## [How to update Makie.jl plot based on ComputeGraph?](https://discourse.julialang.org/t/how-to-update-makie-jl-plot-based-on-computegraph/136730)

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**Author:** [@juliohm](https://discourse.julialang.org/u/juliohm)\
**Replies:** 12\
**Last updated:** [April 29, 2026, 8:29pm UTC](https://discourse.julialang.org/t/how-to-update-makie-jl-plot-based-on-computegraph/136730 "2026-04-29T20:29:18Z")

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I am using the ComputeGraph feature of Makie.jl for the first time. After adding widgets (observables) as nodes in the graph, I also added nodes for the plot objects: # initialize scene with elements # that do not depen…

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## [MTK programmatic populating initial guess values](https://discourse.julialang.org/t/mtk-programmatic-populating-initial-guess-values/136912)

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**Author:** [@mark.garnett](https://discourse.julialang.org/u/mark.garnett)\
**Replies:** 4\
**Last updated:** [April 29, 2026, 3:36pm UTC](https://discourse.julialang.org/t/mtk-programmatic-populating-initial-guess-values/136912 "2026-04-29T15:36:34Z")

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Hi all, this should be really easy but I can’t quite figure it out. When you create an MTK system, and want to solve it as a NonlinearProblem, ODEProblem, or whatever, you often need provide an initial guess or initial …

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## [Makie: how to add some gap to the right end of a figure?](https://discourse.julialang.org/t/makie-how-to-add-some-gap-to-the-right-end-of-a-figure/136907)

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**Author:** [@Datseris](https://discourse.julialang.org/u/Datseris)\
**Replies:** 5\
**Last updated:** [April 29, 2026, 9:08am UTC](https://discourse.julialang.org/t/makie-how-to-add-some-gap-to-the-right-end-of-a-figure/136907 "2026-04-29T09:08:39Z")

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I have a figure that is composed of two columns. Each column is itself a GridLayout. I am having the problem that on the right end of the figure, the axes labels go over the figure boundary: How do I fix this? I don’t…

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## [CUDA.jl with @threads causing memory leak?](https://discourse.julialang.org/t/cuda-jl-with-threads-causing-memory-leak/136853)

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**Author:** [@noetheriankoala](https://discourse.julialang.org/u/noetheriankoala)\
**Replies:** 3\
**Last updated:** [April 27, 2026, 10:23pm UTC](https://discourse.julialang.org/t/cuda-jl-with-threads-causing-memory-leak/136853 "2026-04-27T22:23:37Z")

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Hello. First of all, I am using Julia v1.12.6, CUDA v5.11.2, and FLoops v0.2.2. Consider the following code and comments. using CUDA using Base.Threads function func1() A = CuArray{Float64}(undef, 1500, 1500, 1000)…

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## [JuMP: unused \`@operator\` has critical impact](https://discourse.julialang.org/t/jump-unused-operator-has-critical-impact/136895)

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**Author:** [@cstjean](https://discourse.julialang.org/u/cstjean)\
**Replies:** 2\
**Last updated:** [April 27, 2026, 5:45am UTC](https://discourse.julialang.org/t/jump-unused-operator-has-critical-impact/136895 "2026-04-27T05:45:25Z")

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I have some model defined like fake\_fun(a,b) = 0 function my\_model() ... @operator(m, unused\_op, 2, fake\_fun) ... end where both unused\_op and fake\_fun are not used anywhere except on that line. With thi…

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## [Modify axis options when using Plots.jl with pgfplotsx backend](https://discourse.julialang.org/t/modify-axis-options-when-using-plots-jl-with-pgfplotsx-backend/121292)

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**Author:** [@lcm](https://discourse.julialang.org/u/lcm)\
**Replies:** 3\
**Last updated:** [April 26, 2026, 4:31pm UTC](https://discourse.julialang.org/t/modify-axis-options-when-using-plots-jl-with-pgfplotsx-backend/121292 "2026-04-26T16:31:33Z")

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I am using Plots.jl with the pgfplotsx() backend for emitting .tikz files. Together with the tikzscale LaTeX package this makes for nice plots for a TeX document. However, in the emitted plots there are a lot of options…

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## [AD over runtime-selected fields in nested structs — design patterns?](https://discourse.julialang.org/t/ad-over-runtime-selected-fields-in-nested-structs-design-patterns/136882)

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**Author:** [@stevenhughes](https://discourse.julialang.org/u/stevenhughes)\
**Replies:** 4\
**Last updated:** [April 26, 2026, 12:10pm UTC](https://discourse.julialang.org/t/ad-over-runtime-selected-fields-in-nested-structs-design-patterns/136882 "2026-04-26T12:10:49Z")

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We have a framework where users define models as nested structs and declare at runtime which fields are optimization variables. The framework then needs to differentiate constraints/objectives with respect to those selec…

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## [Error 10005: Cannot retrieve UnbdRay from Gurobi](https://discourse.julialang.org/t/error-10005-cannot-retrieve-unbdray-from-gurobi/136886)

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**Author:** [@WalterMadelim](https://discourse.julialang.org/u/WalterMadelim)\
**Replies:** 4\
**Last updated:** [April 26, 2026, 11:39am UTC](https://discourse.julialang.org/t/error-10005-cannot-retrieve-unbdray-from-gurobi/136886 "2026-04-26T11:39:08Z")

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Is this a bug? julia\> Gurobi.GRBsetdblattrarray(lps.o, "Obj", 1, xllen, mst.Xlb) 0 julia\> function opt\_and\_ter(m) # my definition of optimize! and return Gurobi's termination code o, r = m.o, m.refi …

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## [Ignore masked tokens (Flux.jl)](https://discourse.julialang.org/t/ignore-masked-tokens-flux-jl/75591)

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**Author:** [@spragud2](https://discourse.julialang.org/u/spragud2)\
**Replies:** 6\
**Last updated:** [April 24, 2026, 7:56pm UTC](https://discourse.julialang.org/t/ignore-masked-tokens-flux-jl/75591 "2026-04-24T19:56:14Z")

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Hi, I’m working on implementing a seq2seq model in Flux. Is there a standard method, or if not a suitable approach, for ignoring masked tokens when computing the gradient? E.g. sentences of differing lengths, following …

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## [Makie: WGLMakie after reverse proxy (nginx)](https://discourse.julialang.org/t/makie-wglmakie-after-reverse-proxy-nginx/136847)

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**Author:** [@dmolina](https://discourse.julialang.org/u/dmolina)\
**Replies:** 6\
**Last updated:** [April 24, 2026, 9:45am UTC](https://discourse.julialang.org/t/makie-wglmakie-after-reverse-proxy-nginx/136847 "2026-04-24T09:45:06Z")

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Dear all, I have a notebook in Pluto/PlutoSliderServer with several interactive graphics in a server for my students. My previous version was using Plots, but it was awfully slow, so I decided to try the WGLMakie and Ob…

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## [Unpredictable Compilation Performance of MTK-Generated Functions](https://discourse.julialang.org/t/unpredictable-compilation-performance-of-mtk-generated-functions/136827)

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**Author:** [@chen\_hardworking](https://discourse.julialang.org/u/chen_hardworking)\
**Replies:** 19\
**Last updated:** [April 24, 2026, 5:14am UTC](https://discourse.julialang.org/t/unpredictable-compilation-performance-of-mtk-generated-functions/136827 "2026-04-24T05:14:18Z")

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Problem Statement: I am reporting a critical bottleneck regarding the compilation and loading stability of functions generated by ModelingToolkit.jl. My experience shows that the complexity of the generated symbolic Jaco…

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## [Number of threads assigned via SLURM](https://discourse.julialang.org/t/number-of-threads-assigned-via-slurm/136820)

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**Author:** [@pulk\_jain](https://discourse.julialang.org/u/pulk_jain)\
**Replies:** 5\
**Last updated:** [April 24, 2026, 4:50am UTC](https://discourse.julialang.org/t/number-of-threads-assigned-via-slurm/136820 "2026-04-24T04:50:26Z")

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I am trying to run some multi-threaded code on a cluster using SLURM. #SBATCH --cpus-per-task=4 JPATH=$HOME/.juliaup/bin export JULIA\_DEPOT\_PATH="/my/storage/dir/.julia:" export JULIA\_NUM\_THREADS=auto $JPATH/julia main\_…

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## [How to improve structural\_simplify performance?](https://discourse.julialang.org/t/how-to-improve-structural-simplify-performance/127260)

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**Author:** [@Bart\_van\_de\_Lint](https://discourse.julialang.org/u/Bart_van_de_Lint)\
**Replies:** 17\
**Last updated:** [April 23, 2026, 4:08am UTC](https://discourse.julialang.org/t/how-to-improve-structural-simplify-performance/127260 "2026-04-23T04:08:24Z")

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Modelingtoolkits structural\_simplify can be very slow on bigger systems. What can I do to improve it’s performance? Should I write my equations in a certain way, should I split up big equations into smaller ones, or shou…

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## [Jump, MultiObjectiveAlgorithms - How do manuelly set priorities of objectives](https://discourse.julialang.org/t/jump-multiobjectivealgorithms-how-do-manuelly-set-priorities-of-objectives/136823)

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**Author:** [@Caroline](https://discourse.julialang.org/u/Caroline)\
**Replies:** 2\
**Last updated:** [April 22, 2026, 8:40pm UTC](https://discourse.julialang.org/t/jump-multiobjectivealgorithms-how-do-manuelly-set-priorities-of-objectives/136823 "2026-04-22T20:40:49Z")

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Hi everyone! I’m new to Julia and trying to use it to implement a MILP with multiple objectives. I haven’t been able to find how to set the priorities for the different objectives. Here objective 1 is x+5 and objective 2…

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## [Modeling scale-up and economic factors in DYAD (bioprocess / fermentation)](https://discourse.julialang.org/t/modeling-scale-up-and-economic-factors-in-dyad-bioprocess-fermentation/136777)

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**Author:** [@mpampuch](https://discourse.julialang.org/u/mpampuch)\
**Replies:** 1\
**Last updated:** [April 21, 2026, 6:27pm UTC](https://discourse.julialang.org/t/modeling-scale-up-and-economic-factors-in-dyad-bioprocess-fermentation/136777 "2026-04-21T18:27:29Z")

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Hi all, I’m new to DYAD, so apologies if this is a basic question. I’m exploring whether DYAD is a good fit for modeling for my purposes, particularly modelling and analyzing the feasibility of fermentation systems. My…

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## [Argmax mapreduce on GPU](https://discourse.julialang.org/t/argmax-mapreduce-on-gpu/134971)

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**Author:** [@noetheriankoala](https://discourse.julialang.org/u/noetheriankoala)\
**Replies:** 6\
**Last updated:** [April 21, 2026, 9:35am UTC](https://discourse.julialang.org/t/argmax-mapreduce-on-gpu/134971 "2026-04-21T09:35:03Z")

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Hello! I am trying to quickly compute \\text{argmax}\_{\\substack{1 \\leq s \\leq k\\\\ k+1 \\leq t \\leq n}} A\_{s,t} + (1-\\ell\_s)(1 + \\ell\_t) I do this on the CPU with the following code. f = ((i, j),) -\> (i, j, A\[i, j\]^2 + …

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## [Creating a macro to call @tullio with arbitrary dimensions](https://discourse.julialang.org/t/creating-a-macro-to-call-tullio-with-arbitrary-dimensions/135848)

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**Author:** [@nicrummel](https://discourse.julialang.org/u/nicrummel)\
**Replies:** 2\
**Last updated:** [April 20, 2026, 11:21am UTC](https://discourse.julialang.org/t/creating-a-macro-to-call-tullio-with-arbitrary-dimensions/135848 "2026-04-20T11:21:27Z")

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Hello everyone, Custom Macro I am hoping to be able to write a macro that can call @tullio to specify an arbitrary sized linear form. I think this should follow from some easy-ish fix similar to an old thread… but I am …

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## [Circuit measured using a sampling filter](https://discourse.julialang.org/t/circuit-measured-using-a-sampling-filter/136687)

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**Author:** [@josujugo](https://discourse.julialang.org/u/josujugo)\
**Replies:** 10\
**Last updated:** [April 20, 2026, 10:14am UTC](https://discourse.julialang.org/t/circuit-measured-using-a-sampling-filter/136687 "2026-04-20T10:14:42Z")

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Hi, I am trying to implement a digital filter for measuring (samplling and filtering) the voltage of a circuit. The RLC circuit is defined by an ODE. I’ve come up with a simulation using a callback for sampling, but th…

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