# Specific Domains

**URL:** https://discourse.julialang.org/c/domain/10.md?no_subcategories=false&page=546

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**Page:** 547

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## [Knet v0.9.0 supports windows, beats new benchmarks](https://discourse.julialang.org/t/knet-v0-9-0-supports-windows-beats-new-benchmarks/8024)

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**Author:** [@denizyuret](https://discourse.julialang.org/u/denizyuret)\
**Replies:** 0\
**Last updated:** [December 27, 2017, 5:11pm UTC](https://discourse.julialang.org/t/knet-v0-9-0-supports-windows-beats-new-benchmarks/8024 "2017-12-27T17:11:58Z")

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Knet v0.9.0 released with significant performance improvements, new benchmarks and windows support. Compatibility Windows GPU support implemented. (tested with VS-2015, Cuda 9.1) MacOS GPU support improved: nvml only u…

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## [Announcement: An Update on DataFrames Future Plans](https://discourse.julialang.org/t/announcement-an-update-on-dataframes-future-plans/4646)

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**Author:** [@nalimilan](https://discourse.julialang.org/u/nalimilan)\
**Replies:** 40\
**Last updated:** [December 27, 2017, 5:03pm UTC](https://discourse.julialang.org/t/announcement-an-update-on-dataframes-future-plans/4646 "2017-12-27T17:03:42Z")

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This post summarizes the current roadmap for DataFrames.jl and the data ecosystem in general for the Julia 1.0 milestone. Plans have changed significantly since the previous post. Indeed, it has appeared that representin…

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## [Why is the result of the operation between \`SharedMatrix\`es not a \`SharedMatrix\`?](https://discourse.julialang.org/t/why-is-the-result-of-the-operation-between-sharedmatrix-es-not-a-sharedmatrix/8013)

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**Author:** [@usefulhyun](https://discourse.julialang.org/u/usefulhyun)\
**Replies:** 1\
**Last updated:** [December 27, 2017, 5:57am UTC](https://discourse.julialang.org/t/why-is-the-result-of-the-operation-between-sharedmatrix-es-not-a-sharedmatrix/8013 "2017-12-27T05:57:30Z")

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I created two sharedmatrix as the below sm1 = SharedMatrix{Float64}( rand(1000, 1000) ) sm2 = SharedMatrix{Float64}( rand(1000, 1000) ) sm3 = sm1 \* sm2 ---- (1) However, sm3 is of type Matrix{Float64} not of type Sha…

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## [Questions on parallel programming and Threads.@threads vs @parallel with SharedArray](https://discourse.julialang.org/t/questions-on-parallel-programming-and-threads-threads-vs-parallel-with-sharedarray/7985)

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**Author:** [@mohamed82008](https://discourse.julialang.org/u/mohamed82008)\
**Replies:** 7\
**Last updated:** [December 26, 2017, 4:16am UTC](https://discourse.julialang.org/t/questions-on-parallel-programming-and-threads-threads-vs-parallel-with-sharedarray/7985 "2017-12-26T04:16:50Z")

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Hi! I have a few questions on parallel programming and multi-threading. If I understand correctly, the Threads.@threads feature is modeled after OpenMP’s and Cilk’s multi-threading schemes, where one and only one thread…

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## [TensorFlow.jl on a cluster](https://discourse.julialang.org/t/tensorflow-jl-on-a-cluster/7718)

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**Author:** [@Alexander-Barth](https://discourse.julialang.org/u/Alexander-Barth)\
**Replies:** 0\
**Last updated:** [December 12, 2017, 7:45pm UTC](https://discourse.julialang.org/t/tensorflow-jl-on-a-cluster/7718 "2017-12-12T19:45:19Z")

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We have a cluster with 64 nodes and two 8-core processors. Is it possible to use multiple CPUs with TensorFlow.jl using either 16 cores on a single node or multiple nodes ? Are the corresponding functions from the Pyth…

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## [Issues running on a PBS cluster](https://discourse.julialang.org/t/issues-running-on-a-pbs-cluster/7900)

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**Author:** [@juliohm](https://discourse.julialang.org/u/juliohm)\
**Replies:** 0\
**Last updated:** [December 21, 2017, 6:14pm UTC](https://discourse.julialang.org/t/issues-running-on-a-pbs-cluster/7900 "2017-12-21T18:14:52Z")

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I think this is probably related to the issue I am having with a PBS cluster at my university. We can’t use SSH and I still didn’t figure out how to make addprocs\_pbs(100) to work. Do you have recommendations on how to …

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## [Issues with machinefile and SLURM](https://discourse.julialang.org/t/issues-with-machinefile-and-slurm/7882)

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**Author:** [@nickeubank](https://discourse.julialang.org/u/nickeubank)\
**Replies:** 6\
**Last updated:** [December 21, 2017, 6:08pm UTC](https://discourse.julialang.org/t/issues-with-machinefile-and-slurm/7882 "2017-12-21T18:08:37Z")

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Spent last week fighting with issues on a slurm cluster, and having finally figured it out, I wanted to share the result (and a warning): I had been parallelizing through a slurm batch script with this call: julia --ma…

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## [JLD unable to load files from separate folders? ](https://discourse.julialang.org/t/jld-unable-to-load-files-from-separate-folders/7886)

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**Author:** [@gaomrx](https://discourse.julialang.org/u/gaomrx)\
**Replies:** 0\
**Last updated:** [December 20, 2017, 8:48pm UTC](https://discourse.julialang.org/t/jld-unable-to-load-files-from-separate-folders/7886 "2017-12-20T20:48:35Z")

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Duplicate of open issue #201 on Github

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## [Compositional data analysis](https://discourse.julialang.org/t/compositional-data-analysis/7863)

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**Author:** [@juliohm](https://discourse.julialang.org/u/juliohm)\
**Replies:** 1\
**Last updated:** [December 20, 2017, 3:56pm UTC](https://discourse.julialang.org/t/compositional-data-analysis/7863 "2017-12-20T15:56:47Z")

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Any package for compositional data analysis? I may start one if there is no work already on the way.

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## [Generate random value from a given function, out of box](https://discourse.julialang.org/t/generate-random-value-from-a-given-function-out-of-box/5793)

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**Author:** [@misha\_mikhasenko](https://discourse.julialang.org/u/misha_mikhasenko)\
**Replies:** 17\
**Last updated:** [December 20, 2017, 3:50pm UTC](https://discourse.julialang.org/t/generate-random-value-from-a-given-function-out-of-box/5793 "2017-12-20T15:50:49Z")

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Hi, I am looking for a simple way to generate a random number according to a given distribution. The function is not easy to invert and I do not want to do it. I will be happy to find a numerical method. It could digi…

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## [DataFrame unmelt-like operation](https://discourse.julialang.org/t/dataframe-unmelt-like-operation/7875)

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**Author:** [@Tamas\_Papp](https://discourse.julialang.org/u/Tamas_Papp)\
**Replies:** 1\
**Last updated:** [December 20, 2017, 11:53am UTC](https://discourse.julialang.org/t/dataframe-unmelt-like-operation/7875 "2017-12-20T11:53:49Z")

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I have a DataFrame with observations for 2 individuals in a household, and want to “unmelt” it so that they end up in columns, one for each person. MWE: julia\> df = DataFrame(household = repeat(1:5, inner = 2), …

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## [Debugging possible issue with \`machinefile\` option on SLURM system](https://discourse.julialang.org/t/debugging-possible-issue-with-machinefile-option-on-slurm-system/7857)

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**Author:** [@nickeubank](https://discourse.julialang.org/u/nickeubank)\
**Replies:** 9\
**Last updated:** [December 19, 2017, 7:10pm UTC](https://discourse.julialang.org/t/debugging-possible-issue-with-machinefile-option-on-slurm-system/7857 "2017-12-19T19:10:32Z")

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Trying to debug a problem that may be due to julia not using a provided nodefile on a SLURM system. It appears that jobs are getting spun-off on hosts where it shouldn’t be. The SLURM batch script is: #!/bin/bash #SBA…

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## [Parse NLconstraint in JuMP](https://discourse.julialang.org/t/parse-nlconstraint-in-jump/7841)

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**Author:** [@CanLi1](https://discourse.julialang.org/u/CanLi1)\
**Replies:** 2\
**Last updated:** [December 19, 2017, 5:04pm UTC](https://discourse.julialang.org/t/parse-nlconstraint-in-jump/7841 "2017-12-19T17:04:34Z")

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Hi folks, I want do the following in JuMP but I don’t know how to do it. Suppose I already have a model m. In model m, I defined variables x (for simplicity let’s just represent all the variables in x, which is a R^n v…

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## [Type stable matrix factorization corner case with ForwardDiff](https://discourse.julialang.org/t/type-stable-matrix-factorization-corner-case-with-forwarddiff/7791)

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**Author:** [@Tamas\_Papp](https://discourse.julialang.org/u/Tamas_Papp)\
**Replies:** 9\
**Last updated:** [December 19, 2017, 1:21pm UTC](https://discourse.julialang.org/t/type-stable-matrix-factorization-corner-case-with-forwarddiff/7791 "2017-12-19T13:21:16Z")

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I am calculating the log likelihood of multivariate normals with a function like below, and I want it to work smoothly with ForwardDiff.jl. The catch is that when the variance is not psd (eg with zero eigenvalues), I wan…

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## [DataFrames 0.11 released](https://discourse.julialang.org/t/dataframes-0-11-released/7296)

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**Author:** [@nalimilan](https://discourse.julialang.org/u/nalimilan)\
**Replies:** 23\
**Last updated:** [December 19, 2017, 1:19pm UTC](https://discourse.julialang.org/t/dataframes-0-11-released/7296 "2017-12-19T13:19:00Z")

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After a long and complex development period, we are glad to announce that version 0.11.0 of DataFrames has been released. Among other features listed in the release notes, the major change introduced by this version is t…

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## [TensorFlow.jl, set learning rate as Variable](https://discourse.julialang.org/t/tensorflow-jl-set-learning-rate-as-variable/7848)

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**Author:** [@davidavdav](https://discourse.julialang.org/u/davidavdav)\
**Replies:** 0\
**Last updated:** [December 19, 2017, 11:39am UTC](https://discourse.julialang.org/t/tensorflow-jl-set-learning-rate-as-variable/7848 "2017-12-19T11:39:46Z")

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Hello, I’d like to control the learning rate of the optimizer in TensorFlow, so in different stages of the training (actually fixing different parts of the network) I want to be able to set different learning rates. Fr…

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## [Compatibility of Query and Union{T, Missing}](https://discourse.julialang.org/t/compatibility-of-query-and-union-t-missing/7362)

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**Author:** [@davidanthoff](https://discourse.julialang.org/u/davidanthoff)\
**Replies:** 3\
**Last updated:** [November 28, 2017, 5:13pm UTC](https://discourse.julialang.org/t/compatibility-of-query-and-union-t-missing/7362 "2017-11-28T17:13:19Z")

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I just posted this on the slack channel re status of Query/IterableTables/Missings: I don’t see a path for Query and iterable tables to use missing in the julia 1.0 time frame. My read of that discussion so far is that…

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## [Flux 3, now with 100% more Julia!](https://discourse.julialang.org/t/flux-3-now-with-100-more-julia/5824)

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**Author:** [@MikeInnes](https://discourse.julialang.org/u/MikeInnes)\
**Replies:** 18\
**Last updated:** [December 18, 2017, 9:54pm UTC](https://discourse.julialang.org/t/flux-3-now-with-100-more-julia/5824 "2017-12-18T21:54:49Z")

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Flux v0.3 is a big release, with a brand new, pure-Julia backend for machine learning. This lets us immediately support all of Julia’s most powerful features, without having to compile them to a more limited backend like…

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## [Append one line to similar DataFrame gives eltype error](https://discourse.julialang.org/t/append-one-line-to-similar-dataframe-gives-eltype-error/7763)

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**Author:** [@Fred](https://discourse.julialang.org/u/Fred)\
**Replies:** 3\
**Last updated:** [December 18, 2017, 9:38am UTC](https://discourse.julialang.org/t/append-one-line-to-similar-dataframe-gives-eltype-error/7763 "2017-12-18T09:38:29Z")

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Hi, I try top append a line to 2 similar DataFrames, using the strategy described here before DataFrame recent update : But I have some problem because I do not manage to use append!() function without eltype error. …

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## [Build issues with IPOPT](https://discourse.julialang.org/t/build-issues-with-ipopt/7829)

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**Author:** [@Rahul\_Sharma](https://discourse.julialang.org/u/Rahul_Sharma)\
**Replies:** 0\
**Last updated:** [December 18, 2017, 8:12am UTC](https://discourse.julialang.org/t/build-issues-with-ipopt/7829 "2017-12-18T08:12:07Z")

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I am trying to install IPOPT package. But, the Pkg.build("Ipopt") gives the following error (There are a lot of logs but I thought pasting all the output might be helpful. The error is at the last if you want to skip to…

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## [Clarification on pmap master-worker model](https://discourse.julialang.org/t/clarification-on-pmap-master-worker-model/7824)

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**Author:** [@juliohm](https://discourse.julialang.org/u/juliohm)\
**Replies:** 3\
**Last updated:** [December 18, 2017, 3:17am UTC](https://discourse.julialang.org/t/clarification-on-pmap-master-worker-model/7824 "2017-12-18T03:17:14Z")

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In the master-worker model with pmap, what is the correct way of checking for parallel vs. serial execution? if nprocs() \> 1 # do task in parallel else # fallback to serial execution end or if nprocs() \> 2 # do …

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## [Trouble with addprocs](https://discourse.julialang.org/t/trouble-with-addprocs/7818)

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**Author:** [@jebej](https://discourse.julialang.org/u/jebej)\
**Replies:** 9\
**Last updated:** [December 18, 2017, 3:26am UTC](https://discourse.julialang.org/t/trouble-with-addprocs/7818 "2017-12-18T03:26:57Z")

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I’m having trouble with addprocs. I have set up passwordless login via a key (though the key still asks for my password, in case that could be the issue, though I doubt it). I also have looked at other posts here but th…

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## [StackOverflowError](https://discourse.julialang.org/t/stackoverflowerror/7773)

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**Author:** [@bdeonovic](https://discourse.julialang.org/u/bdeonovic)\
**Replies:** 7\
**Last updated:** [December 17, 2017, 8:11pm UTC](https://discourse.julialang.org/t/stackoverflowerror/7773 "2017-12-17T20:11:56Z")

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First time using JuMP. Below is my JuMP specific code. I am getting very vague error when I try to solve the model and so I am not sure how to follow up. I’m not even sure how specific I should get: m = Model(solver=NLo…

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## [pyjulia segfaults with pytorch](https://discourse.julialang.org/t/pyjulia-segfaults-with-pytorch/7814)

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**Author:** [@agadetsky](https://discourse.julialang.org/u/agadetsky)\
**Replies:** 0\
**Last updated:** [December 17, 2017, 12:41pm UTC](https://discourse.julialang.org/t/pyjulia-segfaults-with-pytorch/7814 "2017-12-17T12:41:02Z")

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I train some rnn model and also use pyjulia to get some word embeddings during training, i.e. for each batch I use pyjulia to get word embeddings. First 5-6 epochs all is ok, but then I get the segfault error, it is stra…

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## [Contour plot of density function](https://discourse.julialang.org/t/contour-plot-of-density-function/7806)

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**Author:** [@Tamas\_Papp](https://discourse.julialang.org/u/Tamas_Papp)\
**Replies:** 9\
**Last updated:** [December 17, 2017, 12:00pm UTC](https://discourse.julialang.org/t/contour-plot-of-density-function/7806 "2017-12-17T12:00:21Z")

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I need to make plots that visualize a known probability distribution on \[0,1\]^2. Specifically, when z \\sim \\text{MvNormal}(\\mu, \\Sigma) then x = \\text{logistic}(z\_1) and y = \\text{logistic}(z\_2), which defines a pdf p…

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## [Can the following list of transformations turn a stable well conditioned algorithm into an unstable one?](https://discourse.julialang.org/t/can-the-following-list-of-transformations-turn-a-stable-well-conditioned-algorithm-into-an-unstable-one/7413)

<div class="topic-metadata">

**Author:** [@certik](https://discourse.julialang.org/u/certik)\
**Replies:** 5\
**Last updated:** [December 17, 2017, 6:56am UTC](https://discourse.julialang.org/t/can-the-following-list-of-transformations-turn-a-stable-well-conditioned-algorithm-into-an-unstable-one/7413 "2017-12-17T06:56:08Z")

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Can the following set of transformations: -(a - b) → b - a x - x → 0.0 -(a + b) → (-a) - b -(a + b) → (-b) - a x / C → x \* (1.0 / C) (a \* c) + (b \* c) → (a + b) \* c (a + b) \* c → (a \* c) + (b \* c) a \* (b / c) → (…

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## [JuMP - how to check if particular constraint already exists](https://discourse.julialang.org/t/jump-how-to-check-if-particular-constraint-already-exists/7768)

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**Author:** [@Rafal\_Machalica](https://discourse.julialang.org/u/Rafal_Machalica)\
**Replies:** 3\
**Last updated:** [December 15, 2017, 5:16pm UTC](https://discourse.julialang.org/t/jump-how-to-check-if-particular-constraint-already-exists/7768 "2017-12-15T17:16:59Z")

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Hello, I’m trying to optimize my Integer Linear Model by automatic analysing of the input data and generate lots of constraints like x\[3,45,12,7,8,1\] == 0 I have several different subalghoritms that may return partial…

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## [Small question about Nullable, Missing and DBAPI.jl](https://discourse.julialang.org/t/small-question-about-nullable-missing-and-dbapi-jl/7783)

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**Author:** [@Liso](https://discourse.julialang.org/u/Liso)\
**Replies:** 1\
**Last updated:** [December 15, 2017, 1:57pm UTC](https://discourse.julialang.org/t/small-question-about-nullable-missing-and-dbapi-jl/7783 "2017-12-15T13:57:24Z")

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DBAPI says: Null Handling All values of type T that could be null should be returned as Nullable{T}. Is it still valid?

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## [Fate of ReverseDiffSource](https://discourse.julialang.org/t/fate-of-reversediffsource/7743)

<div class="topic-metadata">

**Author:** [@cscherrer](https://discourse.julialang.org/u/cscherrer)\
**Replies:** 12\
**Last updated:** [December 15, 2017, 11:17am UTC](https://discourse.julialang.org/t/fate-of-reversediffsource/7743 "2017-12-15T11:17:37Z")

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Though it has some constraints, source-rewrite autodiff is appealing when it can apply, because of the potential code efficiency. Especially for reverse-mode autodiff, the most application is to evaluate gradients, which…

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## [Adding Algencan to JuMP](https://discourse.julialang.org/t/adding-algencan-to-jump/7766)

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**Author:** [@pjssilva](https://discourse.julialang.org/u/pjssilva)\
**Replies:** 5\
**Last updated:** [December 15, 2017, 10:10am UTC](https://discourse.julialang.org/t/adding-algencan-to-jump/7766 "2017-12-15T10:10:25Z")

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Hello, I work in the Optimization group at the University of Campinas. Two of my colleagues have written a very good general purpose nolinear optimization solver called Algencan. https://www.ime.usp.br/~egbirgin/tango/c…

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