# Specific Domains

**URL:** https://discourse.julialang.org/c/domain/10.md?page=5

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

**Page:** 6

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## [Memory allocations in Flux evaluation/training (w/MVE)](https://discourse.julialang.org/t/memory-allocations-in-flux-evaluation-training-w-mve/137175)

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**Author:** [@CrashBurnRepeat](https://discourse.julialang.org/u/CrashBurnRepeat)\
**Replies:** 39\
**Last updated:** [June 6, 2026, 10:00am UTC](https://discourse.julialang.org/t/memory-allocations-in-flux-evaluation-training-w-mve/137175 "2026-06-06T10:00:29Z")

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I’m currently using Flux to do some GAN experiments and I’m finding that the training is painfully slow. On the CPU, a single epoch can take ~30min for a 286x32 sample dataloader. GPU evaluation is faster, but still feel…

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## [GPU (CUDA) vs CPU QR decomposition performance of dense wide complex matrix](https://discourse.julialang.org/t/gpu-cuda-vs-cpu-qr-decomposition-performance-of-dense-wide-complex-matrix/137448)

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**Author:** [@BambOoxX](https://discourse.julialang.org/u/BambOoxX)\
**Replies:** 0\
**Last updated:** [June 4, 2026, 3:54pm UTC](https://discourse.julialang.org/t/gpu-cuda-vs-cpu-qr-decomposition-performance-of-dense-wide-complex-matrix/137448 "2026-06-04T15:54:00Z")

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Hello all, I have an algorithm that requires to compute the QR decomposition (though I’m only interested in R) of a wide complex double precision matrix with a typical size of (400 rows x 16000 columns). I have squeeze…

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## [Reactant.jl recompiles function each time it is called](https://discourse.julialang.org/t/reactant-jl-recompiles-function-each-time-it-is-called/137429)

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**Author:** [@fastwave](https://discourse.julialang.org/u/fastwave)\
**Replies:** 7\
**Last updated:** [June 3, 2026, 5:10pm UTC](https://discourse.julialang.org/t/reactant-jl-recompiles-function-each-time-it-is-called/137429 "2026-06-03T17:10:36Z")

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I am trying to use an optimiser from Manopt.jl to train a Lux.jl neural network using Reactant.jl. It is orders of magnitude slower than without Reactant.jl. Does anyone know how to fix it? The compiled functions, when …

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## [Issues solving DifferentialEquations EnsembleProblem](https://discourse.julialang.org/t/issues-solving-differentialequations-ensembleproblem/137413)

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**Author:** [@Theodore\_Rieger](https://discourse.julialang.org/u/Theodore_Rieger)\
**Replies:** 2\
**Last updated:** [June 3, 2026, 9:50am UTC](https://discourse.julialang.org/t/issues-solving-differentialequations-ensembleproblem/137413 "2026-06-03T09:50:05Z")

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Hello, I was trying to experiment with ensemble problems from differentialequations package. I’m very quickly running into a roadblock in that even the examples from documentation are producing errors. Below is an exampl…

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## [Fuzzy Logic for Verifying Numerical Order of a Method](https://discourse.julialang.org/t/fuzzy-logic-for-verifying-numerical-order-of-a-method/137385)

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**Author:** [@leespen1](https://discourse.julialang.org/u/leespen1)\
**Replies:** 6\
**Last updated:** [June 3, 2026, 12:53am UTC](https://discourse.julialang.org/t/fuzzy-logic-for-verifying-numerical-order-of-a-method/137385 "2026-06-03T00:53:08Z")

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I often program numerical methods for solving initial value problems, and would like to test their order of convergence. However, I find that it is difficult to have automated convergence tests, due to the pre-asymptotic…

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## [Derivative-free optimization of bounded nonlinear least squares](https://discourse.julialang.org/t/derivative-free-optimization-of-bounded-nonlinear-least-squares/137302)

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**Author:** [@claudiop21](https://discourse.julialang.org/u/claudiop21)\
**Replies:** 13\
**Last updated:** [May 31, 2026, 5:28pm UTC](https://discourse.julialang.org/t/derivative-free-optimization-of-bounded-nonlinear-least-squares/137302 "2026-05-31T17:28:40Z")

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Hello everybody! I am looking for an optimization package to solve the following minimization problem: \\min\_{\\bf x \\in \\Omega} \\frac{1}{2}||{\\bf f} ({\\bf x})||^2 + \\lambda ||{\\bf x}||^2, where \\Omega is a bounded dom…

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## [Legend items with italic parts in AlgebraOfGraphics](https://discourse.julialang.org/t/legend-items-with-italic-parts-in-algebraofgraphics/137341)

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**Author:** [@stelmo](https://discourse.julialang.org/u/stelmo)\
**Replies:** 4\
**Last updated:** [May 30, 2026, 8:35am UTC](https://discourse.julialang.org/t/legend-items-with-italic-parts-in-algebraofgraphics/137341 "2026-05-30T08:35:04Z")

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Is there a way to display legend items in AoG that are made of rich text objects? For example, in biology it is usual for species names to be written in italics. It seems the best way to do this with Makie is to use Rich…

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## [Request for Computational Review: Laser-Assisted Vapor-Quench Synthesis Model (Metamaterials)](https://discourse.julialang.org/t/request-for-computational-review-laser-assisted-vapor-quench-synthesis-model-metamaterials/137332)

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**Author:** [@Taxi\_Schramm](https://discourse.julialang.org/u/Taxi_Schramm)\
**Replies:** 0\
**Last updated:** [May 29, 2026, 2:39am UTC](https://discourse.julialang.org/t/request-for-computational-review-laser-assisted-vapor-quench-synthesis-model-metamaterials/137332 "2026-05-29T02:39:38Z")

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Hello everyone, I am an independent researcher at Malt Studios, operating under an Open Source Humanity framework. I am looking to get a rigorous peer review and stress test on the physical parameters for a localized la…

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## [Makie cascading menus](https://discourse.julialang.org/t/makie-cascading-menus/136488)

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**Author:** [@Jake](https://discourse.julialang.org/u/Jake)\
**Replies:** 2\
**Last updated:** [May 28, 2026, 11:28am UTC](https://discourse.julialang.org/t/makie-cascading-menus/136488 "2026-05-28T11:28:45Z")

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I am trying to build some cascading menus in Makie.jl. If we call them menu1, menu2, menu3, then the options in menu2 will depend upon the result of menu1, and likewise the options in menu3 will depend up the selection …

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## [Surrogate with derivatives](https://discourse.julialang.org/t/surrogate-with-derivatives/137277)

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**Author:** [@Tamas\_Papp](https://discourse.julialang.org/u/Tamas_Papp)\
**Replies:** 6\
**Last updated:** [May 26, 2026, 11:42am UTC](https://discourse.julialang.org/t/surrogate-with-derivatives/137277 "2026-05-26T11:42:02Z")

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I am solving an implicit function f(x, y(x)) = 0 with x, y \\in \\mathbb{R}^n (typical n is 50–200), using iterative methods (trust region), at many x’s. This question is about finding a good initial value y\_0(x) for ea…

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## [DRM Radio 📻 & Julia](https://discourse.julialang.org/t/drm-radio-julia/136346)

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**Author:** [@raman\_kumar](https://discourse.julialang.org/u/raman_kumar)\
**Replies:** 10\
**Last updated:** [May 25, 2026, 3:59pm UTC](https://discourse.julialang.org/t/drm-radio-julia/136346 "2026-05-25T15:59:05Z")

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I see that Digital Radio Mondiale is replacing analog radios in many countries. Can Julia be used in this DE9180 Demonstration and Prototyping Kit for the DRM1000 Broadcast Receiver Module | CMLMicro ? CMLMicro is using …

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## [CUDA backward real complex FFT](https://discourse.julialang.org/t/cuda-backward-real-complex-fft/137254)

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**Author:** [@FerreolS](https://discourse.julialang.org/u/FerreolS)\
**Replies:** 2\
**Last updated:** [May 23, 2026, 9:12pm UTC](https://discourse.julialang.org/t/cuda-backward-real-complex-fft/137254 "2026-05-23T21:12:58Z")

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I’m trying to perform a convolution using CUDA fft and something puzzle me when comparing CPU and GPU result: using Adapt, CUDA, FFTW, AbstractFFTs T = Float32 sz = (2048,2048) x = randn(T,sz); x\_gpu = adapt(CuArray,x);…

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## [Inconsistent unknown selection in MTK with identical systems (@mtkcompile)](https://discourse.julialang.org/t/inconsistent-unknown-selection-in-mtk-with-identical-systems-mtkcompile/137225)

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**Author:** [@celia.bat](https://discourse.julialang.org/u/celia.bat)\
**Replies:** 3\
**Last updated:** [May 22, 2026, 5:01pm UTC](https://discourse.julialang.org/t/inconsistent-unknown-selection-in-mtk-with-identical-systems-mtkcompile/137225 "2026-05-22T17:01:13Z")

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I encountered an inconsistent behavior with ModelingToolkit.jl regarding the selected unknowns after structural simplification / compilation. I built a minimal working example (MWE) where simply changing the name of one…

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## [Lux & Reactant on Colab TPUs](https://discourse.julialang.org/t/lux-reactant-on-colab-tpus/126926)

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**Author:** [@avikpal](https://discourse.julialang.org/u/avikpal)\
**Replies:** 5\
**Last updated:** [May 21, 2026, 5:30pm UTC](https://discourse.julialang.org/t/lux-reactant-on-colab-tpus/126926 "2026-05-21T17:30:22Z")

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Colab now has Lux and Reactant pre-installed. Here’s a starter script for TPUs (change the runtime, and it will automatically work on CPU or GPU)

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## [Possible color error in plot(seriestype=:shape)](https://discourse.julialang.org/t/possible-color-error-in-plot-seriestype-shape/137162)

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**Author:** [@dankelley](https://discourse.julialang.org/u/dankelley)\
**Replies:** 3\
**Last updated:** [May 21, 2026, 11:42am UTC](https://discourse.julialang.org/t/possible-color-error-in-plot-seriestype-shape/137162 "2026-05-21T11:42:15Z")

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I’m finding that a plot() call with seriestype=:shape can use the wrong colour. This is on a fairly large dataset (over 50Mb) so I pared it down to the attached. The second plot gets yellow paint, not the gray paint th…

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## [Creating JuMP decision variables more cautiously](https://discourse.julialang.org/t/creating-jump-decision-variables-more-cautiously/137208)

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**Author:** [@WalterMadelim](https://discourse.julialang.org/u/WalterMadelim)\
**Replies:** 4\
**Last updated:** [May 21, 2026, 2:52am UTC](https://discourse.julialang.org/t/creating-jump-decision-variables-more-cautiously/137208 "2026-05-21T02:52:31Z")

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I’m studying the Unit Commitment problem which typically has a 24-hour planning horizon. So each generator (if we use the 2-Bin formulation with turn-on decision u and ON/OFF state decision x) will have at least 48 binar…

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## [Reactant.jl CUDA Version](https://discourse.julialang.org/t/reactant-jl-cuda-version/137211)

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**Author:** [@csvance](https://discourse.julialang.org/u/csvance)\
**Replies:** 0\
**Last updated:** [May 20, 2026, 11:45am UTC](https://discourse.julialang.org/t/reactant-jl-cuda-version/137211 "2026-05-20T11:45:16Z")

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Is there a recommended CUDA driver version + version of CUDA.jl I should be using with Reactant.jl? It looks like there are conflicting versions of CUDA somewhere. I0000 00:00:1779236186.222218 3515013 service.cc:178\] X…

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## [CUDA.jl random number generation](https://discourse.julialang.org/t/cuda-jl-random-number-generation/137209)

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**Author:** [@shiroghost](https://discourse.julialang.org/u/shiroghost)\
**Replies:** 2\
**Last updated:** [May 20, 2026, 11:11am UTC](https://discourse.julialang.org/t/cuda-jl-random-number-generation/137209 "2026-05-20T11:11:29Z")

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Hi all, I am trying to understand Random Numbers generated in CUDA. In particular which RNG is used in each version/case. If I understood this correctly: using CUDA v = randn(Float64, N) will use CUDA.jl interface, …

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## [Ideal diode switching with multiple voltage sources in ModelingToolkit , solver gets stuck at t=0](https://discourse.julialang.org/t/ideal-diode-switching-with-multiple-voltage-sources-in-modelingtoolkit-solver-gets-stuck-at-t-0/137086)

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**Author:** [@JaviJR](https://discourse.julialang.org/u/JaviJR)\
**Replies:** 48\
**Last updated:** [May 20, 2026, 10:59am UTC](https://discourse.julialang.org/t/ideal-diode-switching-with-multiple-voltage-sources-in-modelingtoolkit-solver-gets-stuck-at-t-0/137086 "2026-05-20T10:59:57Z")

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Hi everyone, My research team and I have been working with Julia and ModelingToolkit for a while now and have obtained quite satisfactory results overall (our focus is on wind turbine modeling). Recently, however, we st…

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## [Metal 4 TensorOps](https://discourse.julialang.org/t/metal-4-tensorops/137202)

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**Author:** [@JarJar](https://discourse.julialang.org/u/JarJar)\
**Replies:** 0\
**Last updated:** [May 19, 2026, 10:46pm UTC](https://discourse.julialang.org/t/metal-4-tensorops/137202 "2026-05-19T22:46:54Z")

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Hi, Does Metal.jl support the new Metal 4 TensorOps API? Thanks!

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## [Does anybody know OpenMDAO](https://discourse.julialang.org/t/does-anybody-know-openmdao/122840)

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**Author:** [@ufechner7](https://discourse.julialang.org/u/ufechner7)\
**Replies:** 3\
**Last updated:** [May 19, 2026, 4:08pm UTC](https://discourse.julialang.org/t/does-anybody-know-openmdao/122840 "2026-05-19T16:08:39Z")

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One of our project partners suggested to use GitHub - OpenMDAO/OpenMDAO: OpenMDAO repository. for control co-design, which is based on Python. Is this a good framework, or are there better alternatives using Julia?

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## [Raycore.jl Binding TLAS does not exist](https://discourse.julialang.org/t/raycore-jl-binding-tlas-does-not-exist/137193)

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**Author:** [@xor0110](https://discourse.julialang.org/u/xor0110)\
**Replies:** 0\
**Last updated:** [May 19, 2026, 3:13pm UTC](https://discourse.julialang.org/t/raycore-jl-binding-tlas-does-not-exist/137193 "2026-05-19T15:13:17Z")

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I’m trying to use the package Raycore, but as I try to follow the basic example on the README: using Raycore, GeometryBasics, LinearAlgebra # Create geometry mesh = normal\_mesh(Sphere(Point3f(0, 0, 2), 1.0f0)) # Build…

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## [Significantly Higher VRAM Usage and Slower Training on Flux Compared to PyTorch](https://discourse.julialang.org/t/significantly-higher-vram-usage-and-slower-training-on-flux-compared-to-pytorch/137124)

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**Author:** [@JoshuaBillson](https://discourse.julialang.org/u/JoshuaBillson)\
**Replies:** 25\
**Last updated:** [May 18, 2026, 2:59pm UTC](https://discourse.julialang.org/t/significantly-higher-vram-usage-and-slower-training-on-flux-compared-to-pytorch/137124 "2026-05-18T14:59:25Z")

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I’ve been working on a project where I’m converting Timm models to Flux along with their pre-trained weights. Everything is going well so far, but I noticed that Flux has significantly higher VRAM consumption and takes a…

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## [GSoC 2026: Out-of-Core Computing in Dagger - Initial Prototyping](https://discourse.julialang.org/t/gsoc-2026-out-of-core-computing-in-dagger-initial-prototyping/137161)

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**Author:** [@rainerrodrigues](https://discourse.julialang.org/u/rainerrodrigues)\
**Replies:** 0\
**Last updated:** [May 18, 2026, 11:16am UTC](https://discourse.julialang.org/t/gsoc-2026-out-of-core-computing-in-dagger-initial-prototyping/137161 "2026-05-18T11:16:30Z")

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Hi everyone! I’m Rainer. I’m preparing a GSoC proposal for the Out-of-Core Computing project for Dagger.jl. Coming from a background in mechatronics and embedded systems, dealing with strict hardware memory constraint…

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## [Minimal PINN example in Julia that works with current packages?](https://discourse.julialang.org/t/minimal-pinn-example-in-julia-that-works-with-current-packages/137147)

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**Author:** [@photor](https://discourse.julialang.org/u/photor)\
**Replies:** 4\
**Last updated:** [May 18, 2026, 8:59am UTC](https://discourse.julialang.org/t/minimal-pinn-example-in-julia-that-works-with-current-packages/137147 "2026-05-18T08:59:03Z")

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Hi, I’m trying to write a simple PINN (e.g., Newton cooling ODE) in Julia. I’ve tried Flux + Zygote but keep hitting issues from recent API changes and slow higher‑order AD. What’s the current recommended stack and a min…

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## [Reading STDF Tester Data Files](https://discourse.julialang.org/t/reading-stdf-tester-data-files/14216)

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**Author:** [@Ed\_Ferrari](https://discourse.julialang.org/u/Ed_Ferrari)\
**Replies:** 1\
**Last updated:** [May 17, 2026, 8:19pm UTC](https://discourse.julialang.org/t/reading-stdf-tester-data-files/14216 "2026-05-17T20:19:56Z")

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Totally new to Julia but considering learning it to develop analysis tools for our test data. Our most common format for tester data is STDF Teradyne Test Data Format. Is there a way to import STDF file fomated data for …

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## [Open source Solver to replace CPLEX in example?](https://discourse.julialang.org/t/open-source-solver-to-replace-cplex-in-example/137097)

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**Author:** [@rt9f](https://discourse.julialang.org/u/rt9f)\
**Replies:** 6\
**Last updated:** [May 17, 2026, 8:03am UTC](https://discourse.julialang.org/t/open-source-solver-to-replace-cplex-in-example/137097 "2026-05-17T08:03:35Z")

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Ten years ago this week, I read an article entitled Optimization in Julia. It was my first introduction to Julia and a great example of how easy one can define a constrained optimization problem in JuMP. The example used…

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## [Dyad - Warning: Verbosity toggle: max\_iters](https://discourse.julialang.org/t/dyad-warning-verbosity-toggle-max-iters/137133)

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**Author:** [@gruemelmonster](https://discourse.julialang.org/u/gruemelmonster)\
**Replies:** 2\
**Last updated:** [May 15, 2026, 3:08pm UTC](https://discourse.julialang.org/t/dyad-warning-verbosity-toggle-max-iters/137133 "2026-05-15T15:08:11Z")

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I build a model of a grid rectifier with some diodes and switches (fsw ~50kHz). The simulation results look quite good, but I am getting this warning: ┌ Warning: Verbosity toggle: max\_iters │ Interrupted. Larger maxi…

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## [Avoiding Mutation vs Allocation](https://discourse.julialang.org/t/avoiding-mutation-vs-allocation/137123)

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**Author:** [@johnb](https://discourse.julialang.org/u/johnb)\
**Replies:** 7\
**Last updated:** [May 15, 2026, 2:35pm UTC](https://discourse.julialang.org/t/avoiding-mutation-vs-allocation/137123 "2026-05-15T14:35:33Z")

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I’ve been writing code for dynamic models in Julia for a few years now, and I keep running into a conflict between allocations and mutation. To improve ODE solve performance, I need to write in-place functions and preall…

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## [More Barplots](https://discourse.julialang.org/t/more-barplots/137117)

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**Author:** [@Mervyn\_Larrier](https://discourse.julialang.org/u/Mervyn_Larrier)\
**Replies:** 10\
**Last updated:** [May 15, 2026, 11:02am UTC](https://discourse.julialang.org/t/more-barplots/137117 "2026-05-15T11:02:03Z")

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Hi all. Round two of figuring out bar plots in Makie. Given the data, I would like to plot one set of data and then stack the other data on top of it. In my last question, my issue was resolved with the n\_dodge attribute…

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