# Specific Domains

**URL:** https://discourse.julialang.org/c/domain/10.md?page=133

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**Page:** 134

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## [Plotting ODEProblem solutions with Makie](https://discourse.julialang.org/t/plotting-odeproblem-solutions-with-makie/58096)

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**Author:** [@airpmb](https://discourse.julialang.org/u/airpmb)\
**Replies:** 6\
**Last updated:** [February 21, 2024, 8:39pm UTC](https://discourse.julialang.org/t/plotting-odeproblem-solutions-with-makie/58096 "2024-02-21T20:39:26Z")

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Whatever (plot recipes?) allows for the solution output from solving an ODEProblem in ModelingToolkit.jl (or maybe just OrdinaryDiffEq.jl?) to be just plotted using Plots.jl is wonderful and magical. I love how it’s poss…

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## [Lazy constraints & issues with presolve](https://discourse.julialang.org/t/lazy-constraints-issues-with-presolve/110449)

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**Author:** [@salvaguerrero](https://discourse.julialang.org/u/salvaguerrero)\
**Replies:** 3\
**Last updated:** [February 21, 2024, 7:32pm UTC](https://discourse.julialang.org/t/lazy-constraints-issues-with-presolve/110449 "2024-02-21T19:32:55Z")

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Good morning community, I’m trying to use lazy constraints, but I’m finding some issues. I would like to solve a problem iterative (benders decomposition) where in each iteration an additional constraint is added as la…

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## [Finite difference Laplacian with five-point stencil](https://discourse.julialang.org/t/finite-difference-laplacian-with-five-point-stencil/25014)

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**Author:** [@Vortico](https://discourse.julialang.org/u/Vortico)\
**Replies:** 8\
**Last updated:** [February 21, 2024, 7:23pm UTC](https://discourse.julialang.org/t/finite-difference-laplacian-with-five-point-stencil/25014 "2024-02-21T19:23:31Z")

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This is my first day learning Julia, and I’m not sure of an elegant way to compute the finite difference Laplacian on an NxM Float32 array. \\Delta f(x,y) \\approx f(x-1,y) + f(x+1,y) + f(x,y-1) + f(x,y+1) - 4f(x,y) Base…

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## [CairoMakie get 3d plots to respect z order](https://discourse.julialang.org/t/cairomakie-get-3d-plots-to-respect-z-order/110428)

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**Author:** [@p\_f](https://discourse.julialang.org/u/p_f)\
**Replies:** 5\
**Last updated:** [February 21, 2024, 6:09pm UTC](https://discourse.julialang.org/t/cairomakie-get-3d-plots-to-respect-z-order/110428 "2024-02-21T18:09:59Z")

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I’m trying to export figure as a PDF using CairoMakie. Some of my subplots are 3d axes. I’m plotting several surfaces that wrap around each other, so some parts of surface A are behind surface B and some parts are in fro…

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## [Help to find package for DSA (Discrete Stochastic Arithmetic) implementation](https://discourse.julialang.org/t/help-to-find-package-for-dsa-discrete-stochastic-arithmetic-implementation/110391)

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**Author:** [@hungpham3112](https://discourse.julialang.org/u/hungpham3112)\
**Replies:** 5\
**Last updated:** [February 21, 2024, 4:30pm UTC](https://discourse.julialang.org/t/help-to-find-package-for-dsa-discrete-stochastic-arithmetic-implementation/110391 "2024-02-21T16:30:44Z")

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Hi, I’m working in a project where we use DSA method (based-on CESTAC) to validate results of numerical software. Currently, I’m using Cadna (written in C) to solve this problem. The advantage of Cadna is it has example …

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## [Subplots CairoMakie](https://discourse.julialang.org/t/subplots-cairomakie/110504)

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**Author:** [@Sergey\_Novak](https://discourse.julialang.org/u/Sergey_Novak)\
**Replies:** 4\
**Last updated:** [February 21, 2024, 9:43am UTC](https://discourse.julialang.org/t/subplots-cairomakie/110504 "2024-02-21T09:43:43Z")

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Hello, i want plot N subplots and off for all subplots ticks on axis. For example i do it in python with matplotlib. How can i do this with CairoMakie? Thank you for your helps

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## [How to hand-craft an edge into a Pluto's a computational graph?](https://discourse.julialang.org/t/how-to-hand-craft-an-edge-into-a-plutos-a-computational-graph/108619)

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**Author:** [@vvbond](https://discourse.julialang.org/u/vvbond)\
**Replies:** 11\
**Last updated:** [February 21, 2024, 9:00am UTC](https://discourse.julialang.org/t/how-to-hand-craft-an-edge-into-a-plutos-a-computational-graph/108619 "2024-02-21T09:00:33Z")

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Consider the following contrived example of a Pluto notebook: First of all, I have a hard time even to visualise the corresponding computational graph. Below is my attempt to indicate by the dashed arrow that the com…

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## [Shared legend for subplots in Plotly](https://discourse.julialang.org/t/shared-legend-for-subplots-in-plotly/110497)

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**Author:** [@PeX](https://discourse.julialang.org/u/PeX)\
**Replies:** 0\
**Last updated:** [February 21, 2024, 4:58am UTC](https://discourse.julialang.org/t/shared-legend-for-subplots-in-plotly/110497 "2024-02-21T04:58:12Z")

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I’ve seen variations of this question, but nothing fits my case exactly so I’m trying.: I want to create three subplots in Plotly that share the same legend, I use the following code: p = \[p\_1; p\_2; p\_3\] relayout!(p, h…

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## [Trouble writing custom rule in Enzyme: \`AssertionError: !(overwritten\[end\])\`](https://discourse.julialang.org/t/trouble-writing-custom-rule-in-enzyme-assertionerror-overwritten-end/108939)

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**Author:** [@Gianluca\_Fuwa](https://discourse.julialang.org/u/Gianluca_Fuwa)\
**Replies:** 3\
**Last updated:** [February 20, 2024, 11:25pm UTC](https://discourse.julialang.org/t/trouble-writing-custom-rule-in-enzyme-assertionerror-overwritten-end/108939 "2024-02-20T23:25:57Z")

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Hi, I am currently trying to use Enzyme to get the derivative of a function that takes a multidimensional array of 3x3 matrices and outputs a scalar. The caveat is that these matrices are elements of the Lie-group of sp…

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## [LoadError: UndefVarError: \`libglpk\` not defined](https://discourse.julialang.org/t/loaderror-undefvarerror-libglpk-not-defined/110480)

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**Author:** [@Carl\_Baier](https://discourse.julialang.org/u/Carl_Baier)\
**Replies:** 7\
**Last updated:** [February 20, 2024, 11:16pm UTC](https://discourse.julialang.org/t/loaderror-undefvarerror-libglpk-not-defined/110480 "2024-02-20T23:16:52Z")

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Hello, i have this code: using libglpk using GLPK using JuMP using Gurobi using DataFrames using BlockDecomposition, Coluna; I\_list = \[1, 2, 3\] T\_list = \[1, 2, 3, 4, 5, 6, 7\] K\_list = \[1, 2, 3\] alpha=0.01 M = 10000 Ma…

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## [Matrix for storage sol from DifferentialEquations](https://discourse.julialang.org/t/matrix-for-storage-sol-from-differentialequations/110464)

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**Author:** [@Sergey\_Novak](https://discourse.julialang.org/u/Sergey_Novak)\
**Replies:** 2\
**Last updated:** [February 20, 2024, 5:12pm UTC](https://discourse.julialang.org/t/matrix-for-storage-sol-from-differentialequations/110464 "2024-02-20T17:12:07Z")

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Hello, i solve system with different initial condition and i want to save all sol. I’m thinking about creating a matrix or vector and storing solutions there for various initial conditions. How can this be done? Thank yo…

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## [Autodiff Enzyme reverse mode sometimes fails on on repeated evaluation](https://discourse.julialang.org/t/autodiff-enzyme-reverse-mode-sometimes-fails-on-on-repeated-evaluation/110017)

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**Author:** [@dchang10](https://discourse.julialang.org/u/dchang10)\
**Replies:** 7\
**Last updated:** [February 20, 2024, 3:27pm UTC](https://discourse.julialang.org/t/autodiff-enzyme-reverse-mode-sometimes-fails-on-on-repeated-evaluation/110017 "2024-02-20T15:27:04Z")

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I’m developing a package which has a function defined the following way function emission\_radius(pix::Krang.AbstractPixel, θs::T, isindir, n) where {T} α, β = screen\_coordinate(pix) θo = inclination(pix) met…

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## [Recording of Makie hist changes output](https://discourse.julialang.org/t/recording-of-makie-hist-changes-output/110440)

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**Author:** [@DrBurner](https://discourse.julialang.org/u/DrBurner)\
**Replies:** 2\
**Last updated:** [February 20, 2024, 1:11pm UTC](https://discourse.julialang.org/t/recording-of-makie-hist-changes-output/110440 "2024-02-20T13:11:26Z")

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I’d like to make a short video of the build up of an histogram with a little bit of white space between the bins . Unfortunately the record block seems to ignore the width keyword. using GLMakie samples=rand(1:10,100) …

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## [Access JuMP variables queried as string](https://discourse.julialang.org/t/access-jump-variables-queried-as-string/110393)

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**Author:** [@math\_opt](https://discourse.julialang.org/u/math_opt)\
**Replies:** 10\
**Last updated:** [February 20, 2024, 12:16pm UTC](https://discourse.julialang.org/t/access-jump-variables-queried-as-string/110393 "2024-02-20T12:16:06Z")

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If a user wants to know the variable values for a JuMP model that is not exposed to the user directly, what are the options? For example: using JuMP using HiGHS #some arbitrary JuMP model model = Model(HiGHS.Optimizer)…

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## [How to extract convergence status in Optim.jl?](https://discourse.julialang.org/t/how-to-extract-convergence-status-in-optim-jl/110430)

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**Author:** [@Wooheon](https://discourse.julialang.org/u/Wooheon)\
**Replies:** 2\
**Last updated:** [February 20, 2024, 12:41am UTC](https://discourse.julialang.org/t/how-to-extract-convergence-status-in-optim-jl/110430 "2024-02-20T00:41:02Z")

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I ran several optimization problems with different models, but some didn’t seem to calculate the result but spit out some random results. So, I would like to know how to extract the status of the ‘optimized’ results, but…

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## [How to pass a constraint as Lazy with Gurobi?](https://discourse.julialang.org/t/how-to-pass-a-constraint-as-lazy-with-gurobi/110294)

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**Author:** [@K5Julien](https://discourse.julialang.org/u/K5Julien)\
**Replies:** 5\
**Last updated:** [February 19, 2024, 5:57pm UTC](https://discourse.julialang.org/t/how-to-pass-a-constraint-as-lazy-with-gurobi/110294 "2024-02-19T17:57:50Z")

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I want to pass a constraint as Lazy in the beginning of my JuMP model. Note that I do not want it to be a lazy constraint called in a Callback. How am I supposed to do it? The corresponding Gurobi parameter is: It …

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## [Makie plotting: GLib-GIO-WARNING](https://discourse.julialang.org/t/makie-plotting-glib-gio-warning/64478)

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**Author:** [@JosephPollacco](https://discourse.julialang.org/u/JosephPollacco)\
**Replies:** 2\
**Last updated:** [February 19, 2024, 4:40pm UTC](https://discourse.julialang.org/t/makie-plotting-glib-gio-warning/64478 "2024-02-19T16:40:13Z")

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Hallo :grinning\_face\_with\_smiling\_eyes:, I am using the excellent Makie plotting package. When I am compiling the code I am getting the following Warnings, GLib-GIO-WARNING \*which I suspect is caused by the package Cair…

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## [Methods to solve system of linear equations with equiality constraint](https://discourse.julialang.org/t/methods-to-solve-system-of-linear-equations-with-equiality-constraint/110403)

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**Author:** [@Gregstrq](https://discourse.julialang.org/u/Gregstrq)\
**Replies:** 4\
**Last updated:** [February 19, 2024, 3:00pm UTC](https://discourse.julialang.org/t/methods-to-solve-system-of-linear-equations-with-equiality-constraint/110403 "2024-02-19T15:00:02Z")

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Hello, everyone. I want to solve a system of linear equations Ax = b with some linear equality constraints. A is square but non-symmetric. The equation corresponds to a linearized stationary Boltzman equation, and the…

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## [Client code for SSE (Server Sent Events) with HTTP.jl](https://discourse.julialang.org/t/client-code-for-sse-server-sent-events-with-http-jl/110386)

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**Author:** [@screw\_dog](https://discourse.julialang.org/u/screw_dog)\
**Replies:** 1\
**Last updated:** [February 19, 2024, 2:08pm UTC](https://discourse.julialang.org/t/client-code-for-sse-server-sent-events-with-http-jl/110386 "2024-02-19T14:08:07Z")

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I’m attempting to receive SSE from a Mastodon instance, following the API described in the official docs. Firstly, I can’t get HTTP.open to work. Attempting: HTTP.open("get", "https://aus.social/api/v1/streaming/public…

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## [Can't run a Resnet code](https://discourse.julialang.org/t/cant-run-a-resnet-code/110303)

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**Author:** [@delcencen](https://discourse.julialang.org/u/delcencen)\
**Replies:** 3\
**Last updated:** [February 19, 2024, 1:12pm UTC](https://discourse.julialang.org/t/cant-run-a-resnet-code/110303 "2024-02-19T13:12:10Z")

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Hello, in this code i ave the 2 following errors : -ERROR: LoadError: UndefVarError: \`Resnet\` not defined -ERROR: LoadError: UndefVarError: \`get\_classes\` not defined the code of my book : using Flux using M…

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## [Rolling (time) average of a timeseries of images](https://discourse.julialang.org/t/rolling-time-average-of-a-timeseries-of-images/110352)

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**Author:** [@JonathanH](https://discourse.julialang.org/u/JonathanH)\
**Replies:** 3\
**Last updated:** [February 19, 2024, 9:59am UTC](https://discourse.julialang.org/t/rolling-time-average-of-a-timeseries-of-images/110352 "2024-02-19T09:59:36Z")

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Hi all, I am new to Julia, and this may be a very straightforward question. I have a timeseries of images, and I am trying to calculate a pixel-wise rolling time average. The obvious choice for doing this would be the m…

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## [Do not update neural network weights with a value of 0](https://discourse.julialang.org/t/do-not-update-neural-network-weights-with-a-value-of-0/110335)

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**Author:** [@kuanchiun](https://discourse.julialang.org/u/kuanchiun)\
**Replies:** 5\
**Last updated:** [February 19, 2024, 2:42am UTC](https://discourse.julialang.org/t/do-not-update-neural-network-weights-with-a-value-of-0/110335 "2024-02-19T02:42:38Z")

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Hello, I have just been exposed to the field of deep learning for a short time. Recently I was trying to create the 3-dimensional Neural Network, by giving the 3D Array as a pretrained weights. Each 2D matrix in the wei…

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## [Read\_parquet() not defined?](https://discourse.julialang.org/t/read-parquet-not-defined/110380)

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**Author:** [@austin-putz](https://discourse.julialang.org/u/austin-putz)\
**Replies:** 9\
**Last updated:** [February 19, 2024, 1:02am UTC](https://discourse.julialang.org/t/read-parquet-not-defined/110380 "2024-02-19T01:02:26Z")

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Hello, I feel kind of silly here. No idea what I did. I couldn’t seem to load a dataset with Arrow from R (feather). So I jumped to Parquet to test. I used the arrow package in R, have a .parquet file on my hard disk and…

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## [Labeling a categorical color dimension in 3d scatter in Makie](https://discourse.julialang.org/t/labeling-a-categorical-color-dimension-in-3d-scatter-in-makie/110072)

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**Author:** [@tp2750](https://discourse.julialang.org/u/tp2750)\
**Replies:** 1\
**Last updated:** [February 18, 2024, 6:43pm UTC](https://discourse.julialang.org/t/labeling-a-categorical-color-dimension-in-3d-scatter-in-makie/110072 "2024-02-18T18:43:14Z")

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I’m trying to do a 3D Iris plot in Makie, but I can not figure out how to label the color dimension. Here is what I do: using DataFrames using WGLMakie using RDatasets using CategoricalArrays iris = dataset("datasets",…

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## [Solving linear system with sum of kronecker products](https://discourse.julialang.org/t/solving-linear-system-with-sum-of-kronecker-products/109253)

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**Author:** [@Tamas\_Papp](https://discourse.julialang.org/u/Tamas_Papp)\
**Replies:** 21\
**Last updated:** [February 18, 2024, 11:35am UTC](https://discourse.julialang.org/t/solving-linear-system-with-sum-of-kronecker-products/109253 "2024-02-18T11:35:39Z")

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Suppose I have ((A \\otimes B) + (C \\otimes D))x = v where A and C and B and D have the same size, respectively. Suppose also that I particularly want to avoid instantiating the Kronecker products since they are large. …

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## [DifferentialEquations.jl -- change in \`remake\`?](https://discourse.julialang.org/t/differentialequations-jl-change-in-remake/110283)

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**Author:** [@BLI](https://discourse.julialang.org/u/BLI)\
**Replies:** 8\
**Last updated:** [February 18, 2024, 10:48am UTC](https://discourse.julialang.org/t/differentialequations-jl-change-in-remake/110283 "2024-02-18T10:48:07Z")

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Has there been a change in the remake function recently? The following code worked one month ago: prob\_rm = remake(prob, u0=\[\], p=p\_modify) sol = solve(prob\_rm, QBDF(), reltol=1e-5,tstops=t\_u\_switch) Now, I get an err…

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## [Optimizing a CUDA-based Loss Function for Neural Network Training](https://discourse.julialang.org/t/optimizing-a-cuda-based-loss-function-for-neural-network-training/110365)

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**Author:** [@josemanuel22](https://discourse.julialang.org/u/josemanuel22)\
**Replies:** 0\
**Last updated:** [February 18, 2024, 8:54am UTC](https://discourse.julialang.org/t/optimizing-a-cuda-based-loss-function-for-neural-network-training/110365 "2024-02-18T08:54:36Z")

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This post is hidden. You deleted this post 8 hours ago. I have been working on the following loss function to train neural networks based on a statistical invariant. I have tried to port the function to GPU/CUDA, and I …

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## [Using LSTM cell in Lux with explicit parameters](https://discourse.julialang.org/t/using-lstm-cell-in-lux-with-explicit-parameters/110199)

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**Author:** [@kunal](https://discourse.julialang.org/u/kunal)\
**Replies:** 0\
**Last updated:** [February 14, 2024, 4:06am UTC](https://discourse.julialang.org/t/using-lstm-cell-in-lux-with-explicit-parameters/110199 "2024-02-14T04:06:26Z")

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Hi, I was referring to the Simple LSTM tutorial, which combines classifier(Dense layer) with LSTMCell using AbstractExplicitContainerLayer. Also, in my case I am passing explicit parameters to the neural net. NN = L…

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## [MethodError in importing excel table using XLSX](https://discourse.julialang.org/t/methoderror-in-importing-excel-table-using-xlsx/110357)

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**Author:** [@PeX](https://discourse.julialang.org/u/PeX)\
**Replies:** 1\
**Last updated:** [February 17, 2024, 10:38pm UTC](https://discourse.julialang.org/t/methoderror-in-importing-excel-table-using-xlsx/110357 "2024-02-17T22:38:20Z")

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Hi everyone, I’m trying to import an excel table into a dataframe using: df\_data = DataFrame(XLSX.readtable(file\_path, "styles", columns="A:H", infer\_eltypes=true, first\_row=3)) But I’m getting MethodError: no met…

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## [Indexing problem SDDP package](https://discourse.julialang.org/t/indexing-problem-sddp-package/110291)

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**Author:** [@heiwie](https://discourse.julialang.org/u/heiwie)\
**Replies:** 4\
**Last updated:** [February 17, 2024, 10:33pm UTC](https://discourse.julialang.org/t/indexing-problem-sddp-package/110291 "2024-02-17T22:33:26Z")

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I am trying to define a hydropower production problem in Julia using the SDDP package. When running the code I get this error: “ERROR: KeyError: key Symbol(“w2\[3\]”) not found”. This error seems like it is being caused b…

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