# Specific Domains

**URL:** https://discourse.julialang.org/c/domain/10.md?page=417

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**Page:** 418

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## [Obscure multiplication method error when using sciml\_train](https://discourse.julialang.org/t/obscure-multiplication-method-error-when-using-sciml-train/45906)

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**Author:** [@told](https://discourse.julialang.org/u/told)\
**Replies:** 7\
**Last updated:** [October 7, 2020, 5:28pm UTC](https://discourse.julialang.org/t/obscure-multiplication-method-error-when-using-sciml-train/45906 "2020-10-07T17:28:26Z")

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Julia newbie here. I solve a convection diffusion reaction problem in tow variables where the reaction term is replaced with an ANN with two inputs and one output. This should be trained against measured data c\_true. D…

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## [Button doesn't do anything in Pluto](https://discourse.julialang.org/t/button-doesnt-do-anything-in-pluto/46381)

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**Author:** [@Daneel](https://discourse.julialang.org/u/Daneel)\
**Replies:** 7\
**Last updated:** [October 7, 2020, 3:50pm UTC](https://discourse.julialang.org/t/button-doesnt-do-anything-in-pluto/46381 "2020-10-07T15:50:08Z")

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I’m trying to create a simple plotting interface in Pluto.jl but because of the slowness of loading data I need to prevent Pluto from plotting until all of the settings are chosen. The button seemed like a good method bu…

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## [Using the noise parameters sol.W.W from an SDE solution throws an error when taking gradients](https://discourse.julialang.org/t/using-the-noise-parameters-sol-w-w-from-an-sde-solution-throws-an-error-when-taking-gradients/47640)

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**Author:** [@MikeKlocCZ](https://discourse.julialang.org/u/MikeKlocCZ)\
**Replies:** 3\
**Last updated:** [October 7, 2020, 2:13pm UTC](https://discourse.julialang.org/t/using-the-noise-parameters-sol-w-w-from-an-sde-solution-throws-an-error-when-taking-gradients/47640 "2020-10-07T14:13:03Z")

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I need to work with individual Wiener increments from an SDE solution in my loss function. Whenever I try to get these values from sol.W.W command, the ERROR: type Nothing has no field W pops up when computing the gradie…

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## [Estimating the parameters of ODEs with multiple initial conditions using Bayesian methods](https://discourse.julialang.org/t/estimating-the-parameters-of-odes-with-multiple-initial-conditions-using-bayesian-methods/47903)

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**Author:** [@nyubachi](https://discourse.julialang.org/u/nyubachi)\
**Replies:** 2\
**Last updated:** [October 7, 2020, 2:45am UTC](https://discourse.julialang.org/t/estimating-the-parameters-of-odes-with-multiple-initial-conditions-using-bayesian-methods/47903 "2020-10-07T02:45:15Z")

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Hello. https://tutorials.sciml.ai/html/ode\_extras/04-monte\_carlo\_parameter\_estim.html In the above tutorial, MonteCarloProblem() is used to estimate the parameters for ODEs with multiple initial conditions. I would li…

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## [Variables declaration in JuliaPro 1.5.2-1](https://discourse.julialang.org/t/variables-declaration-in-juliapro-1-5-2-1/47802)

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**Author:** [@RaquelSantos](https://discourse.julialang.org/u/RaquelSantos)\
**Replies:** 10\
**Last updated:** [October 6, 2020, 7:58pm UTC](https://discourse.julialang.org/t/variables-declaration-in-juliapro-1-5-2-1/47802 "2020-10-06T19:58:44Z")

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When compiling @variabel on my model, julia displays the following message Expected ModeloDeterministico to be a JuMP model, but it has type DataType error(::String, ::Type{T} where T) at error.jl:42 validmodel(::Type{T…

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## [What is defination of dims](https://discourse.julialang.org/t/what-is-defination-of-dims/47878)

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**Author:** [@Batuhan\_Guvenc](https://discourse.julialang.org/u/Batuhan_Guvenc)\
**Replies:** 1\
**Last updated:** [October 6, 2020, 6:39pm UTC](https://discourse.julialang.org/t/what-is-defination-of-dims/47878 "2020-10-06T18:39:14Z")

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search func which gives sum of every matris rows in a list for matris like this 1 0 1 0 1 0 output \[2,1\] i fins sum(list,dims=2) func but i dont want use this for examle i use " +(list…) "instead of "sum(list) "i…

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## [GMT.jl errors when trying to plot- problem with PNG?](https://discourse.julialang.org/t/gmt-jl-errors-when-trying-to-plot-problem-with-png/47860)

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**Author:** [@mihalybaci](https://discourse.julialang.org/u/mihalybaci)\
**Replies:** 4\
**Last updated:** [October 6, 2020, 4:33pm UTC](https://discourse.julialang.org/t/gmt-jl-errors-when-trying-to-plot-problem-with-png/47860 "2020-10-06T16:33:43Z")

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For some reason, I cannot get GMT.jl to work. When I attempt to do the “Hello, World” example plot I get the following message: Error: /undefined in PSL\_movie\_label\_completion (skipping the stacktrace...) ERROR: Some…

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## [Error when calling 2D dynamic kernel with view argument](https://discourse.julialang.org/t/error-when-calling-2d-dynamic-kernel-with-view-argument/47647)

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**Author:** [@barrettp](https://discourse.julialang.org/u/barrettp)\
**Replies:** 2\
**Last updated:** [October 6, 2020, 2:23pm UTC](https://discourse.julialang.org/t/error-when-calling-2d-dynamic-kernel-with-view-argument/47647 "2020-10-06T14:23:16Z")

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The following MWE returns a kernel of type Union{} for a 2D dynamic kernel with at least one argument being a view(). The kernel compiles fine if the dynamic kernel is 1D or has no view() arguments. I’d be much obliged …

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## [Partial SVD](https://discourse.julialang.org/t/partial-svd/47820)

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**Author:** [@mleprovost](https://discourse.julialang.org/u/mleprovost)\
**Replies:** 7\
**Last updated:** [October 6, 2020, 6:57am UTC](https://discourse.julialang.org/t/partial-svd/47820 "2020-10-06T06:57:27Z")

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Hello, Is there a command to only perform a partial SVD decomposition of a non-square matrix?

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## [How can I get the loss functions in a multi-class classification Flux.jl neural network to work with Flux.onehotbatch?](https://discourse.julialang.org/t/how-can-i-get-the-loss-functions-in-a-multi-class-classification-flux-jl-neural-network-to-work-with-flux-onehotbatch/47767)

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**Author:** [@qingyanz](https://discourse.julialang.org/u/qingyanz)\
**Replies:** 2\
**Last updated:** [October 5, 2020, 8:45pm UTC](https://discourse.julialang.org/t/how-can-i-get-the-loss-functions-in-a-multi-class-classification-flux-jl-neural-network-to-work-with-flux-onehotbatch/47767 "2020-10-05T20:45:50Z")

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I am trying to set up a model to predict a 8-label classification problem. Suppose the labels are ycat = \["a", "b", "c", "d", "e", "f", "g"\] and I have a sample set of labels to train & test on: ysample = \["a", "a", "g",…

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## [JuliaDB error loading tables](https://discourse.julialang.org/t/juliadb-error-loading-tables/47795)

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**Author:** [@David\_Ortley](https://discourse.julialang.org/u/David_Ortley)\
**Replies:** 1\
**Last updated:** [October 5, 2020, 4:37pm UTC](https://discourse.julialang.org/t/juliadb-error-loading-tables/47795 "2020-10-05T16:37:32Z")

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I frequently have problems reloading the JuliaDB tables that I save. Sometimes they’re smaller tables on the order of a few MBs and sometimes a couple of GBs, but never anything close to how much RAM my machine has. I’…

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## [List of resources using Turing](https://discourse.julialang.org/t/list-of-resources-using-turing/47784)

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**Author:** [@mystis](https://discourse.julialang.org/u/mystis)\
**Replies:** 2\
**Last updated:** [October 5, 2020, 3:23pm UTC](https://discourse.julialang.org/t/list-of-resources-using-turing/47784 "2020-10-05T15:23:30Z")

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Hi everyone, I thought it would nice to have a “Learning” section for Turing, something similar to what exists on the Julialang website. I know there are tutorials and links to Statistical Rethinking but I thought that …

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## [Checking membership in a MathOptInterface Set](https://discourse.julialang.org/t/checking-membership-in-a-mathoptinterface-set/47642)

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**Author:** [@1ozturkbe](https://discourse.julialang.org/u/1ozturkbe)\
**Replies:** 5\
**Last updated:** [October 5, 2020, 3:13pm UTC](https://discourse.julialang.org/t/checking-membership-in-a-mathoptinterface-set/47642 "2020-10-05T15:13:59Z")

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Hello folks, I hope this is an easy question, but unfortunately some of the internals of MathOptInterface and JuMP are opaque. constraint\_object(constraint::ConstraintRef) operation in JuMP returns a ScalarConstraint, w…

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## [StackOverflow Error when plotting DataFrame data](https://discourse.julialang.org/t/stackoverflow-error-when-plotting-dataframe-data/47774)

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**Author:** [@b.lind](https://discourse.julialang.org/u/b.lind)\
**Replies:** 16\
**Last updated:** [October 5, 2020, 1:18pm UTC](https://discourse.julialang.org/t/stackoverflow-error-when-plotting-dataframe-data/47774 "2020-10-05T13:18:04Z")

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I’ve recently adopted Julia to analyze some sensor data recorded in a \*.csv file. I used the code shown below to plot a subset of my data, however the last code block to plot the data fails with the following error: St…

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## [Pmap with multiple GPUs](https://discourse.julialang.org/t/pmap-with-multiple-gpus/47698)

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**Author:** [@theogf](https://discourse.julialang.org/u/theogf)\
**Replies:** 8\
**Last updated:** [October 5, 2020, 8:15am UTC](https://discourse.julialang.org/t/pmap-with-multiple-gpus/47698 "2020-10-05T08:15:31Z")

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Hi, First CUDA.jl is simply amazing and really to use, kudos to you all! Now in my problem I have multiple GPUs and I would like to parallelize the training of my networks in parallel. So basically have one training of…

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## [Numerical Continuation in Julia?](https://discourse.julialang.org/t/numerical-continuation-in-julia/5522)

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**Author:** [@s-marashi](https://discourse.julialang.org/u/s-marashi)\
**Replies:** 9\
**Last updated:** [October 4, 2020, 12:49pm UTC](https://discourse.julialang.org/t/numerical-continuation-in-julia/5522 "2020-10-04T12:49:44Z")

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What are available options for numerical continuation in Julia? While it’s irrelated does any body know about Auto software?

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## [\[Question\] Distributions.jl with CUDA](https://discourse.julialang.org/t/question-distributions-jl-with-cuda/47707)

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**Author:** [@sheevy](https://discourse.julialang.org/u/sheevy)\
**Replies:** 0\
**Last updated:** [October 3, 2020, 9:21pm UTC](https://discourse.julialang.org/t/question-distributions-jl-with-cuda/47707 "2020-10-03T21:21:07Z")

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Hi, I’m writing a program which I wish could easily work both cpu and gpu, similarly to what one can achieve in Flux with cpu and gpu functions. I was under impression that different Julia packages compose well, so I ex…

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## [Run time constraints in optimisation](https://discourse.julialang.org/t/run-time-constraints-in-optimisation/47657)

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**Author:** [@JohnZ](https://discourse.julialang.org/u/JohnZ)\
**Replies:** 8\
**Last updated:** [October 3, 2020, 8:05pm UTC](https://discourse.julialang.org/t/run-time-constraints-in-optimisation/47657 "2020-10-03T20:05:08Z")

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In an optimisation problem, I have some variables which must take same values. A simple example is given below where the optimisation variables with a unique identifier should have same values: using DataFrames using Ju…

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## [Turing type error: expected Float64, got ForwardDiff.Dual](https://discourse.julialang.org/t/turing-type-error-expected-float64-got-forwarddiff-dual/47670)

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**Author:** [@mangulo](https://discourse.julialang.org/u/mangulo)\
**Replies:** 9\
**Last updated:** [October 3, 2020, 5:14pm UTC](https://discourse.julialang.org/t/turing-type-error-expected-float64-got-forwarddiff-dual/47670 "2020-10-03T17:14:26Z")

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Hi All, I’m trying to do a multivariable linear regression y = \\Phi(A, x) using Turing, where y \\in \\mathbb R^N, x \\in \\mathbb R^N, and the function \\Phi is linear in the unknown parameters A \\in \\mathbb R^{N \\times N}.…

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## [Optim.jl --- Do all Methods Allow Box Constraints? Should all Work Without Them?](https://discourse.julialang.org/t/optim-jl-do-all-methods-allow-box-constraints-should-all-work-without-them/10209)

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**Author:** [@iwelch](https://discourse.julialang.org/u/iwelch)\
**Replies:** 35\
**Last updated:** [October 3, 2020, 3:28pm UTC](https://discourse.julialang.org/t/optim-jl-do-all-methods-allow-box-constraints-should-all-work-without-them/10209 "2020-10-03T15:28:35Z")

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I have been experimenting with Optim.jl. Do all optimizers offer box constraints? NOTE: All optimizers I tried can work without box constraints, except the brand new SAMIN. This example failed to use them: juli…

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## [Can't access moment\_matrix() function in SumOfSquares](https://discourse.julialang.org/t/cant-access-moment-matrix-function-in-sumofsquares/47624)

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**Author:** [@aliceee](https://discourse.julialang.org/u/aliceee)\
**Replies:** 3\
**Last updated:** [October 3, 2020, 8:25am UTC](https://discourse.julialang.org/t/cant-access-moment-matrix-function-in-sumofsquares/47624 "2020-10-03T08:25:45Z")

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Hi, I’m trying to use the moment\_matrix function in SumOfSquares package. using MultivariateMoments ν3 = moment\_matrix(constr) However, I got the following error: ArgumentError: ModelLike of type MosekModel does not s…

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## [Can you export plots with the plotly back-end as interactive plots?](https://discourse.julialang.org/t/can-you-export-plots-with-the-plotly-back-end-as-interactive-plots/31377)

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**Author:** [@ElectronicTeaCup](https://discourse.julialang.org/u/ElectronicTeaCup)\
**Replies:** 1\
**Last updated:** [October 3, 2020, 6:35am UTC](https://discourse.julialang.org/t/can-you-export-plots-with-the-plotly-back-end-as-interactive-plots/31377 "2020-10-03T06:35:26Z")

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Suppose I have to share a plot I made using Plots.jl with the plotly back-end. Can I export it in a format that would let a user (without anything Julia related installed) be able to open it and interact it with the way …

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## [Suggestion needed: Tree like structure for adaptive binning of multidim data](https://discourse.julialang.org/t/suggestion-needed-tree-like-structure-for-adaptive-binning-of-multidim-data/47602)

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**Author:** [@francesco.alemanno](https://discourse.julialang.org/u/francesco.alemanno)\
**Replies:** 6\
**Last updated:** [October 2, 2020, 9:01pm UTC](https://discourse.julialang.org/t/suggestion-needed-tree-like-structure-for-adaptive-binning-of-multidim-data/47602 "2020-10-02T21:01:52Z")

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Hi everyone, i need to perform adaptive binning of multidimensional data, in an online fashion. as far as i understand i need a dynamic kd-tree, is there something in the julia ecosystem that implements a structure re…

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## [State of JuAFEM](https://discourse.julialang.org/t/state-of-juafem/39183)

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**Author:** [@CorbinFoucart](https://discourse.julialang.org/u/CorbinFoucart)\
**Replies:** 2\
**Last updated:** [October 2, 2020, 6:17pm UTC](https://discourse.julialang.org/t/state-of-juafem/39183 "2020-10-02T18:17:09Z")

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I’m reading the JuAFEM dev docs and it’s not immediately apparent whether a few things are supported. Are: general unstructured grids (tet, hex) wedge elements nonconforming and adaptive meshes supported? Secondly, i…

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## [Hierarchical Component Models in ModelingToolkit, How to Connect](https://discourse.julialang.org/t/hierarchical-component-models-in-modelingtoolkit-how-to-connect/47626)

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**Author:** [@mefob](https://discourse.julialang.org/u/mefob)\
**Replies:** 2\
**Last updated:** [October 2, 2020, 5:20pm UTC](https://discourse.julialang.org/t/hierarchical-component-models-in-modelingtoolkit-how-to-connect/47626 "2020-10-02T17:20:49Z")

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I am trying to build a hierarchical model of groups of Lorenz oscillators. I am following the tutorial, but instead of solving the pair of coupled oscillators, I’d like to solve a set of many pairs of coupled oscillators…

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## [Flux vs pytorch cpu performance](https://discourse.julialang.org/t/flux-vs-pytorch-cpu-performance/42667)

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**Author:** [@d1cker](https://discourse.julialang.org/u/d1cker)\
**Replies:** 59\
**Last updated:** [October 2, 2020, 3:39pm UTC](https://discourse.julialang.org/t/flux-vs-pytorch-cpu-performance/42667 "2020-10-02T15:39:07Z")

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Hi, I’m trying to make my colleagues use Julia, but I got this performance issue with some simple code. At first I though that the problem is use the AD but now I think it’s with the feed forward (and because of that th…

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## [Two questions on Flux](https://discourse.julialang.org/t/two-questions-on-flux/22307)

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**Author:** [@BLI](https://discourse.julialang.org/u/BLI)\
**Replies:** 23\
**Last updated:** [October 2, 2020, 3:28pm UTC](https://discourse.julialang.org/t/two-questions-on-flux/22307 "2020-10-02T15:28:35Z")

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I’ve watched videos in JuliaAcademy (I recommend them), and continued playing around with Flux. To test Flux, I’ve tried to re-create simple results from: Bishop, Chris M. (1994). “Neural networks and their application…

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## [Pgfplotsx, plots: non-uniform colormaps only partially implemented](https://discourse.julialang.org/t/pgfplotsx-plots-non-uniform-colormaps-only-partially-implemented/47621)

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**Author:** [@AntoninDellaNoce](https://discourse.julialang.org/u/AntoninDellaNoce)\
**Replies:** 15\
**Last updated:** [October 2, 2020, 2:16pm UTC](https://discourse.julialang.org/t/pgfplotsx-plots-non-uniform-colormaps-only-partially-implemented/47621 "2020-10-02T14:16:40Z")

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Hi, I have an error at the level of pgfplots package when using pgfplotsx() backend to draw surfaces. Here is the working example provided by the Plots documentation surface(range(-3,3, length=30), range(-3,3, length=3…

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## [Random number generators](https://discourse.julialang.org/t/random-number-generators/47613)

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**Author:** [@caetanotc](https://discourse.julialang.org/u/caetanotc)\
**Replies:** 3\
**Last updated:** [October 2, 2020, 1:28pm UTC](https://discourse.julialang.org/t/random-number-generators/47613 "2020-10-02T13:28:41Z")

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Hi, I’m new to julia and have some questions about RNG’s. If I understood well, MersenneTwister is the default method, but MersenneTwister objects are linked with the Random library and rand() function isn’t. When usin…

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## [GeometricFlux: GCNConv but with different graphs](https://discourse.julialang.org/t/geometricflux-gcnconv-but-with-different-graphs/36518)

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**Author:** [@rkurchin](https://discourse.julialang.org/u/rkurchin)\
**Replies:** 12\
**Last updated:** [October 2, 2020, 5:08am UTC](https://discourse.julialang.org/t/geometricflux-gcnconv-but-with-different-graphs/36518 "2020-10-02T05:08:24Z")

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I’m working with GeometricFlux and want to adapt the GCNConv layer to allow for different adjacency matrices corresponding to each piece of training data. Since this now requires two separate “streams” of input data (the…

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