Pkg> add results in “no known versions” errors for “Flux” and “Plots”
I am using Julia version 1.5.1 on a Win10 operating system. Trying to add Plots and Flux results in the errors listed below: (@v1.5) pkg> add Plots Resolving package versions... ERROR:...
View ArticleMatrix-by-(slice of)vector multiplication with limited allocation
I am trying to multiply a small matrix by a slice of a vector (subvector), i.e., z[3:7] .= A * x[3:7], and it allocates memory for a copy of the slice. A view is a lightweight option, but it still...
View ArticleFunction Composition and Piping
The following are equivalent based on the docs. Is there a Julian preference or functional reason to choose one over another, or is it just a matter of personal taste? Nesting: g(f(x)) Composition: (g...
View ArticleFlux mutating updates?
I am trying to transfer a model from Python into Julia. Each time I compute my loss function I sample the parameters in my model and store them in a struct. Trying to compute gradients of my loss...
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Code time as color in Plots.jl ... How?
Hi, I am plotting a trajectory in the complex plane. If I plot the whole path Plots.jl offers me this: I would like to know which way it went from beginning to end. I know that Plots.jl offers us a...
View ArticleHow to select half the rows from a DataFrame column and return an array of...
Hi all, I would like to know how one might partition unique string values from one column of the DataFrame © to achieve my goal. using Random, DataFrames C = DataFrame(Team = ["Packers", "Knights",...
View ArticlePerformance issues?
As a learning project I reimplemented a simple Bayesian NN in julia from scratch (hopefully without mistakes!) Benchmarking vs. my Pytorch code on the same CPU I’m seeing a runtime of +30% (using...
View ArticleUnderstanding how variables are stored
After my epic boxes or labels question, I decided to put those analogies aside for the moment and focus on the documentation. On the memory layout page, it states: The jl_value_t struct is the name...
View ArticleCombining DiffEqFlux with Turing for Bayesian Inference and Neural ODEs
Hi all, I’m trying to implement a Bayesian Neural Network. The catch is that this neural network is used to approximate a function that is then integrated to predict time series generated by an ODE....
View ArticleDifferent results between Zygote, ForwardDiff, and ReverseDiff
Hi, I’m quite new to Julia and trying to understand automatic differentiation. I have a loss function for a model, and I’m trying to get the gradient and hessian w.r.t parameters fitted to the model....
View ArticleType inference for a singleton of type Function
I have an object that stores (amongst other things) a vector of functions. When I use multiple functions, everything works nicely. However, if I pass it a vector with a single function, I’m getting...
View ArticleArrays of functions
About the following code: f(x) = 2x + 1 g(x) = x^2 h(x) = x^3 I = [f, g, h] J = Array{Function, 2}(undef, 3, 3) for i ∈ 1:3 for j ∈ 1:3 J[i, j] = I[i] ∘ I[j] end end display(J) I get: 3×3...
View ArticleREPL I/O in a Pkg instead of `readline()`?
Hi everyone, Working on a package to give interactive tutorials for new Julia users. Hit a stumbling block that I’m not convinced has a good answer. Basically here’s what I want to happen: Hi...
View ArticleLINQ inner joins and select all in Query.jl
This MWE is supposed to do an inner join (i.a equals j.c || i.b equals j.e) and output all the elements of the first df: df1 = DataFrame(a=[1,2,3], b=[1.,2.,3.]) df2 = DataFrame(c=[2,4,2], d=["John",...
View ArticleUnmarshalling to a Julia type when type has Union in the Attribute values?
Hi, I am trying to unmarshal a json to a Struct type where there is Union in type attributes but it does not work. Is there a way to do that? That exercise works: using Unmarshal input = "{ \"id\":...
View ArticleConfused by "unsatisfiable requirements"
I have recently upgraded my package SimpleGraphs to version 0.6.1. Other packages that depend on it now can only be used in development mode. For example, my registered package SimpleGraphAlgorithms...
View ArticleTrying to bench two code samples and I'm getting different results @time vs...
I have a DataFrame “results” that is sorted by _.date. I’m experimenting to see the difference between using a filter (A): results |> @filter(_.date >= Dates.Date(2018,1,1) && _.date...
View ArticleUsing the iteration interface with custom indices
I’m a bit confused on how to use iteration utilities with a custom index set. I tried a MWE (just reproducing a for loop) as follows: struct CustomIndex i::Int end struct CustomIndexSet n::Int end...
View ArticleZygote has a problem of derivation in the loss function
I have a problem with Flux. Unfortunately Zygote cannot derive my loss function and I am not sure what it is. It would be nice if someone could help me with this problem. My loss function looks like...
View ArticleCould I use Python Dict or convert Julia Dict to Python Dict in Julia?
Hi, I am writing a piece of code that need to load a Python package with PyCall. But when I transfer a Julia Dict to the package, I got an error. I think it is because the package can not identify the...
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