# Specific Domains

**URL:** https://discourse.julialang.org/c/domain/10.md?no_subcategories=false&page=345

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**Page:** 346

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## [GPU-Kernel function for fast matrix multiplication using shared memory](https://discourse.julialang.org/t/gpu-kernel-function-for-fast-matrix-multiplication-using-shared-memory/66341)

<div class="topic-metadata">

**Author:** [@DanielZ](https://discourse.julialang.org/u/DanielZ)\
**Replies:** 1\
**Last updated:** [August 13, 2021, 2:08pm UTC](https://discourse.julialang.org/t/gpu-kernel-function-for-fast-matrix-multiplication-using-shared-memory/66341 "2021-08-13T14:08:20Z")

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\[Copied from a Slack-Conversation:\] Me (Daniel): Hello, we try to implement a matrix multiplication in a kernel function using shared memory. However, our code in the kernel\_matmul\_fast function calculates a wrong resu…

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## [Row number in DataFrames groupby query](https://discourse.julialang.org/t/row-number-in-dataframes-groupby-query/57319)

<div class="topic-metadata">

**Author:** [@bdeonovic](https://discourse.julialang.org/u/bdeonovic)\
**Replies:** 5\
**Last updated:** [August 13, 2021, 1:30pm UTC](https://discourse.julialang.org/t/row-number-in-dataframes-groupby-query/57319 "2021-08-13T13:30:10Z")

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I’m trying to understand how to do data manipulations in DataFrames (+ Query or + DataFramesMeta or +LINQ), in particular today I am looking to get rownumber in a groupby query For MWE consider df = DataFrame(a=repeat(…

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## [Combining multiple-shooting with out-of-ODE multithreading](https://discourse.julialang.org/t/combining-multiple-shooting-with-out-of-ode-multithreading/66338)

<div class="topic-metadata">

**Author:** [@cmarcotte](https://discourse.julialang.org/u/cmarcotte)\
**Replies:** 1\
**Last updated:** [August 13, 2021, 12:05pm UTC](https://discourse.julialang.org/t/combining-multiple-shooting-with-out-of-ode-multithreading/66338 "2021-08-13T12:05:41Z")

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DiffEqFlux has examples for multiple shooting and out-of-ODE multithreading here and here, respectively. This seems like a natural pairing, but it seems like multiple\_shoot is written for a completely serial implementat…

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## [Gradient of expression with JuMP variables](https://discourse.julialang.org/t/gradient-of-expression-with-jump-variables/66259)

<div class="topic-metadata">

**Author:** [@ver\_kh](https://discourse.julialang.org/u/ver_kh)\
**Replies:** 3\
**Last updated:** [August 13, 2021, 7:16am UTC](https://discourse.julialang.org/t/gradient-of-expression-with-jump-variables/66259 "2021-08-13T07:16:53Z")

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Hi! I have a complex nonlinear expression built with JuMP variables. And now I want to find gradient of this expression with respect to these variables. What package will be helpful in this situation?

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## [AssertionError GCNConv FeaturedGraph GeometricFlux](https://discourse.julialang.org/t/assertionerror-gcnconv-featuredgraph-geometricflux/66061)

<div class="topic-metadata">

**Author:** [@riegel\_gestr](https://discourse.julialang.org/u/riegel_gestr)\
**Replies:** 1\
**Last updated:** [August 13, 2021, 7:09am UTC](https://discourse.julialang.org/t/assertionerror-gcnconv-featuredgraph-geometricflux/66061 "2021-08-13T07:09:24Z")

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I am trying the GeometricFlux library by doing some test (coming from torch\_geometric). So test that I am doing is a simple graphs classification and I have considered very simple input: N = 100 k = 10 g = erdos\_renyi(…

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## [Manning liveProject on data science with Julia](https://discourse.julialang.org/t/manning-liveproject-on-data-science-with-julia/65692)

<div class="topic-metadata">

**Author:** [@bkamins](https://discourse.julialang.org/u/bkamins)\
**Replies:** 5\
**Last updated:** [August 13, 2021, 6:04am UTC](https://discourse.julialang.org/t/manning-liveproject-on-data-science-with-julia/65692 "2021-08-13T06:04:52Z")

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I am soon releasing a liveProject with Manning on doing data science with Julia. You can find the link to it here. The liveProject is - as its name says - project oriented, so expect it to be challenging for someone jus…

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## [Loading touchstone (.snp) files](https://discourse.julialang.org/t/loading-touchstone-snp-files/66012)

<div class="topic-metadata">

**Author:** [@Valery](https://discourse.julialang.org/u/Valery)\
**Replies:** 8\
**Last updated:** [August 13, 2021, 4:03am UTC](https://discourse.julialang.org/t/loading-touchstone-snp-files/66012 "2021-08-13T04:03:08Z")

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At the moment, what is the most convenient way to load touchstone (.snp) files in Julia ? I typically want to load scattering parameter of a multi-channel array extracted from software like Advanced Software Design (ADS…

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## [Recent AI developments: Roformer (transformer w/Rotary Position Embedding) and DL to Rejuvenate Symbolic AI: Neural Production](https://discourse.julialang.org/t/recent-ai-developments-roformer-transformer-w-rotary-position-embedding-and-dl-to-rejuvenate-symbolic-ai-neural-production/66314)

<div class="topic-metadata">

**Author:** [@Palli](https://discourse.julialang.org/u/Palli)\
**Replies:** 4\
**Last updated:** [August 13, 2021, 12:56am UTC](https://discourse.julialang.org/t/recent-ai-developments-roformer-transformer-w-rotary-position-embedding-and-dl-to-rejuvenate-symbolic-ai-neural-production/66314 "2021-08-13T00:56:08Z")

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A. Seems important: ROFORMER: ENHANCED TRANSFORMER WITH ROTARY POSITION EMBEDDING We investigate various methods to encode positional information in transformer-based language models and propose a novel implementati…

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## [FeaturedGraph Explanation](https://discourse.julialang.org/t/featuredgraph-explanation/66294)

<div class="topic-metadata">

**Author:** [@NFSturm](https://discourse.julialang.org/u/NFSturm)\
**Replies:** 0\
**Last updated:** [August 12, 2021, 8:33pm UTC](https://discourse.julialang.org/t/featuredgraph-explanation/66294 "2021-08-12T20:33:34Z")

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Dear Julia Community, I was recently becoming interested in Machine Learning on graphs I found the GeometricFlux library that seems to be quite useful in that regard. My understanding of graphs in general is rather basi…

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## [Landau distribution or something similar](https://discourse.julialang.org/t/landau-distribution-or-something-similar/66063)

<div class="topic-metadata">

**Author:** [@tamasgal](https://discourse.julialang.org/u/tamasgal)\
**Replies:** 23\
**Last updated:** [August 12, 2021, 4:45pm UTC](https://discourse.julialang.org/t/landau-distribution-or-something-similar/66063 "2021-08-12T16:45:46Z")

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Good day everyone! I need a tiny toss in the right direction since I am stuck with some statistics problems. I am investigating signals which are similar to a Landau distribution but I don’t have a good physical model …

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## [Plot using for loop](https://discourse.julialang.org/t/plot-using-for-loop/66167)

<div class="topic-metadata">

**Author:** [@Phonindra](https://discourse.julialang.org/u/Phonindra)\
**Replies:** 10\
**Last updated:** [August 12, 2021, 4:22pm UTC](https://discourse.julialang.org/t/plot-using-for-loop/66167 "2021-08-12T16:22:11Z")

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I have ode like this Now if I need the result for a series of different values of the parameter “p”, I was trying to use for loop to do that, here is the code Which shows the following error! Please help me t…

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## [Equating two symbolically symmetric matrices in JuMP without redundant constraints](https://discourse.julialang.org/t/equating-two-symbolically-symmetric-matrices-in-jump-without-redundant-constraints/66274)

<div class="topic-metadata">

**Author:** [@Shuvomoy\_Das\_Gupta](https://discourse.julialang.org/u/Shuvomoy_Das_Gupta)\
**Replies:** 2\
**Last updated:** [August 12, 2021, 3:14pm UTC](https://discourse.julialang.org/t/equating-two-symbolically-symmetric-matrices-in-jump-without-redundant-constraints/66274 "2021-08-12T15:14:06Z")

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Dear All, I am trying to define a constraint to equate two symbolically symmetric matrices and I am wondering if there is a compact way so that JuMP does not store redundant constraints. A simple example is as follows u…

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## [Chebyshev Coefficients for 1/(1+x^2); interpretation of equations in paper](https://discourse.julialang.org/t/chebyshev-coefficients-for-1-1-x-2-interpretation-of-equations-in-paper/66001)

<div class="topic-metadata">

**Author:** [@blackeneth](https://discourse.julialang.org/u/blackeneth)\
**Replies:** 6\
**Last updated:** [August 12, 2021, 2:04pm UTC](https://discourse.julialang.org/t/chebyshev-coefficients-for-1-1-x-2-interpretation-of-equations-in-paper/66001 "2021-08-12T14:04:40Z")

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I need to calculate C2k from the paper, Modification of of Owen’s Method for Computing the Bivariate Normal Integral (DM Borth, 1973). The relevant bit of math is here: Note the sentence, Letting\\ C\_{2k} \\ be\\ the…

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## [Dash.jl slider doesn't display labels](https://discourse.julialang.org/t/dash-jl-slider-doesnt-display-labels/66253)

<div class="topic-metadata">

**Author:** [@Iulian.Cioarca](https://discourse.julialang.org/u/Iulian.Cioarca)\
**Replies:** 1\
**Last updated:** [August 12, 2021, 11:16am UTC](https://discourse.julialang.org/t/dash-jl-slider-doesnt-display-labels/66253 "2021-08-12T11:16:24Z")

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I was messing around with dcc\_slider and observed that labels are missing if the marks argument is constructed using an array of Floats, with zero as decimal (ex: 0.0:10.0). The labels are displayed fine if I use either …

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## [Query optimizer support for indicator constraints](https://discourse.julialang.org/t/query-optimizer-support-for-indicator-constraints/66244)

<div class="topic-metadata">

**Author:** [@SupplyChef](https://discourse.julialang.org/u/SupplyChef)\
**Replies:** 1\
**Last updated:** [August 12, 2021, 3:39am UTC](https://discourse.julialang.org/t/query-optimizer-support-for-indicator-constraints/66244 "2021-08-12T03:39:30Z")

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Hello, Is there a way to query if a solver supports indicator constraints? I’d like to write a function that produces a model that uses indicator constraints if they are supported and reverts to a big-M constraints if n…

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## [Arrow.jl reading compressed(lz4 and zstd) arrow/feather format may have memory leak](https://discourse.julialang.org/t/arrow-jl-reading-compressed-lz4-and-zstd-arrow-feather-format-may-have-memory-leak/52177)

<div class="topic-metadata">

**Author:** [@jesseventura](https://discourse.julialang.org/u/jesseventura)\
**Replies:** 3\
**Last updated:** [August 12, 2021, 1:47am UTC](https://discourse.julialang.org/t/arrow-jl-reading-compressed-lz4-and-zstd-arrow-feather-format-may-have-memory-leak/52177 "2021-08-12T01:47:19Z")

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refer to memory leaking when reading compressed arrow files · Issue #80 · apache/arrow-julia · GitHub I found only when i have a compressed arrow format(lz4 or zstd) , the memory leak problem occurs. uncompressed forma…

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## [Creating an array of symmetric matrix variables in \`JuMP\`](https://discourse.julialang.org/t/creating-an-array-of-symmetric-matrix-variables-in-jump/66229)

<div class="topic-metadata">

**Author:** [@Shuvomoy\_Das\_Gupta](https://discourse.julialang.org/u/Shuvomoy_Das_Gupta)\
**Replies:** 2\
**Last updated:** [August 11, 2021, 9:13pm UTC](https://discourse.julialang.org/t/creating-an-array-of-symmetric-matrix-variables-in-jump/66229 "2021-08-11T21:13:23Z")

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Dear All, I am trying to create an array of symmetric matrix variables in JuMP, i.e., an array of matrix variables X\_i\\in\\mathbf{S}^n for i\\in\\{1,2,\\ldots,N\\}. If I had only one symmetric matrix variable X\\in\\mathbf{S}^…

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## [Get training data from saved machine](https://discourse.julialang.org/t/get-training-data-from-saved-machine/66114)

<div class="topic-metadata">

**Author:** [@Vishal\_Sharma1](https://discourse.julialang.org/u/Vishal_Sharma1)\
**Replies:** 1\
**Last updated:** [August 11, 2021, 9:13pm UTC](https://discourse.julialang.org/t/get-training-data-from-saved-machine/66114 "2021-08-11T21:13:08Z")

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Using MLJ, after saving and retrieving a machine - Is there any method to retrieve the training data that was used to train this machine. I am unable to find any such method in documentation.

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## [Julia v1.7.0-beta3 installs old Turing version](https://discourse.julialang.org/t/julia-v1-7-0-beta3-installs-old-turing-version/66185)

<div class="topic-metadata">

**Author:** [@stst](https://discourse.julialang.org/u/stst)\
**Replies:** 4\
**Last updated:** [August 11, 2021, 4:53pm UTC](https://discourse.julialang.org/t/julia-v1-7-0-beta3-installs-old-turing-version/66185 "2021-08-11T16:53:57Z")

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\] add Turing in the REPL of a fresh Julia v1.7.0-beta3 install on Windows with an emtpy .julia folder installs Turing v0.15.1 instead of the most recent v0.17.0. \] add Turing@v0.17.0 results in an unsatisfiable requirem…

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## [Automatic differentiation of \`cispi\`](https://discourse.julialang.org/t/automatic-differentiation-of-cispi/66075)

<div class="topic-metadata">

**Author:** [@RainerHeintzmann](https://discourse.julialang.org/u/RainerHeintzmann)\
**Replies:** 4\
**Last updated:** [August 11, 2021, 3:43pm UTC](https://discourse.julialang.org/t/automatic-differentiation-of-cispi/66075 "2021-08-11T15:43:20Z")

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I think the rrule for cispi seems to be missing. Maybe it should be included in the basic set of rules? function loss2(data) sum(abs.(cispi.(data))) end data = ones(2,2) loss2(data) gradient(loss2, data) yields: j…

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## [Inconsitency in matrix multiplication](https://discourse.julialang.org/t/inconsitency-in-matrix-multiplication/66193)

<div class="topic-metadata">

**Author:** [@Joseph\_S\_Rebeirro](https://discourse.julialang.org/u/Joseph_S_Rebeirro)\
**Replies:** 4\
**Last updated:** [August 11, 2021, 12:40pm UTC](https://discourse.julialang.org/t/inconsitency-in-matrix-multiplication/66193 "2021-08-11T12:40:27Z")

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Hi All, I was playing with the Quantum optics package and I saw something weird So the resulting matrix is inconsistent in comparison with other CAS systems (Mathematica) Mathematica: # Spin operators Sx = 1/Sq…

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## [Solving inequations](https://discourse.julialang.org/t/solving-inequations/58410)

<div class="topic-metadata">

**Author:** [@statspy](https://discourse.julialang.org/u/statspy)\
**Replies:** 8\
**Last updated:** [August 11, 2021, 9:42am UTC](https://discourse.julialang.org/t/solving-inequations/58410 "2021-08-11T09:42:20Z")

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is there a package to solve inequations in Julia? 2x + 3 \<= x + 7 answer: x\<= 4 Thanks

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## [How to make R, C, etc. parameters in Acausal Component-Based Model (ModelingToolkit example)](https://discourse.julialang.org/t/how-to-make-r-c-etc-parameters-in-acausal-component-based-model-modelingtoolkit-example/66115)

<div class="topic-metadata">

**Author:** [@TS-CUBED](https://discourse.julialang.org/u/TS-CUBED)\
**Replies:** 6\
**Last updated:** [August 11, 2021, 9:04am UTC](https://discourse.julialang.org/t/how-to-make-r-c-etc-parameters-in-acausal-component-based-model-modelingtoolkit-example/66115 "2021-08-11T09:04:39Z")

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Hello, I am trying to move my models to the new ModelingToolkit framework and so far everything works nicely and it creates the models nicely. For simplicity I refer here to the example as outlined in Acausal Component…

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## [Laplace approximation for mixed models in Julia (TMB-like functionality)](https://discourse.julialang.org/t/laplace-approximation-for-mixed-models-in-julia-tmb-like-functionality/61796)

<div class="topic-metadata">

**Author:** [@monnahc](https://discourse.julialang.org/u/monnahc)\
**Replies:** 35\
**Last updated:** [August 10, 2021, 10:26pm UTC](https://discourse.julialang.org/t/laplace-approximation-for-mixed-models-in-julia-tmb-like-functionality/61796 "2021-08-10T22:26:53Z")

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Hello, \[Apologies for lack of URLs, I’m a new user so limited to only 2. I can provide more in a follow up as requested\] I’m writing to inquire about the current state of Julia with respect to the Laplace approximation…

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## [GSP Package](https://discourse.julialang.org/t/gsp-package/66132)

<div class="topic-metadata">

**Author:** [@elefthca](https://discourse.julialang.org/u/elefthca)\
**Replies:** 2\
**Last updated:** [August 10, 2021, 8:40pm UTC](https://discourse.julialang.org/t/gsp-package/66132 "2021-08-10T20:40:48Z")

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Hello everyone! I recently became interested in Graph Signal Processing and upon searching, I found nothing relevant implemented in Julia. I also saw that the call for NumFocus grants opened just a couple of days ago wh…

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## [Tips on writing kernels?](https://discourse.julialang.org/t/tips-on-writing-kernels/66074)

<div class="topic-metadata">

**Author:** [@Ribeiro](https://discourse.julialang.org/u/Ribeiro)\
**Replies:** 4\
**Last updated:** [August 10, 2021, 8:40pm UTC](https://discourse.julialang.org/t/tips-on-writing-kernels/66074 "2021-08-10T20:40:45Z")

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Hello! I’m working on a problem where I have structs with big vectors and I have to compute stuff index vs index (N square). Something like this: for i in 1:length(bigVector1) for j in 1:length(bigVector2) bigVe…

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## [Ridgelets, Shapelets, Curvelets, Radon Transform etc?](https://discourse.julialang.org/t/ridgelets-shapelets-curvelets-radon-transform-etc/45042)

<div class="topic-metadata">

**Author:** [@anon92994695](https://discourse.julialang.org/u/anon92994695)\
**Replies:** 1\
**Last updated:** [August 10, 2021, 3:48pm UTC](https://discourse.julialang.org/t/ridgelets-shapelets-curvelets-radon-transform-etc/45042 "2021-08-10T15:48:22Z")

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Anyone know of efforts in Julia to do these fancy \*-let type DSP operations? I was able to find one repository(https://github.com/NFFT/nfft), but it’s a C effort with only a partial Julia interface(it seems)? Whoever i…

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## [NeuralODE: optimal control action in a constrained optimization problem](https://discourse.julialang.org/t/neuralode-optimal-control-action-in-a-constrained-optimization-problem/63372)

<div class="topic-metadata">

**Author:** [@Antonino\_Gandolfo](https://discourse.julialang.org/u/Antonino_Gandolfo)\
**Replies:** 13\
**Last updated:** [July 26, 2021, 5:03pm UTC](https://discourse.julialang.org/t/neuralode-optimal-control-action-in-a-constrained-optimization-problem/63372 "2021-07-26T17:03:01Z")

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Hi, I’m new with Julia. I want to ask if it’s possible to optimize an differential equation using the NeuralODE. I try to create my code but the problems are the physical constrains. I don’t know how to add this equa…

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## [Mixing GPU/CPU in struct definition](https://discourse.julialang.org/t/mixing-gpu-cpu-in-struct-definition/66066)

<div class="topic-metadata">

**Author:** [@Ribeiro](https://discourse.julialang.org/u/Ribeiro)\
**Replies:** 5\
**Last updated:** [August 10, 2021, 9:37am UTC](https://discourse.julialang.org/t/mixing-gpu-cpu-in-struct-definition/66066 "2021-08-10T09:37:23Z")

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Hello, I use big structs in my code with lots of different vectors of integers and floats like so: mutable struct Bodies a:: Vector{StaticArrays.SVector{3,Float64}} b:: Int c:: Vector{StaticArrays.SVector{3…

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## [Regular JuMP-NLP developer call](https://discourse.julialang.org/t/regular-jump-nlp-developer-call/65797)

<div class="topic-metadata">

**Author:** [@frapac](https://discourse.julialang.org/u/frapac)\
**Replies:** 1\
**Last updated:** [August 10, 2021, 7:37am UTC](https://discourse.julialang.org/t/regular-jump-nlp-developer-call/65797 "2021-08-10T07:37:13Z")

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Hi everyone! Last week at JuMP-dev, we agreed on organizing a regular meeting to discuss the future of nonlinear programming in Julia/JuMP. As a follow-up, I would suggest to organize our first meeting by the end of Au…

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