penelopeysm

using DynamicPPL, Distributions, LogDensityProblems, Chairmarks, LinearAlgebra
using ADTypes, ForwardDiff, ReverseDiff, Enzyme, Mooncake

const adtypes =
    [
        ("FD", AutoForwardDiff()),
        ("RD", AutoReverseDiff()),
        ("RC", AutoReverseDiff(; compile=true)),
        ("MC", AutoMooncake()),
        ("EF" => AutoEnzyme(; mode=set_runtime_activity(Forward))),

penelopeysm

# JuliaFormatter and Runic sysimages
# adapted from https://github.com/domluna/JuliaFormatter.jl/issues/633#issuecomment-1518805248

# Place this in `~/.bash_profile` (or the corresponding config file for your shell).
# You should then be able to run the following commands in your shell:
#
#  - `jf1`: Format with JuliaFormatter@v1
#  - `jf2`: Format with JuliaFormatter@v2
#  - `runic`: Format with Runic
#

penelopeysm

Julia Vararg + Function-type specialization bug

The problem

When a Function subtype (like sum, a closure, etc.) is passed as an element of Vararg{Any,N}, Julia's compiler heuristic widens typeof(sum) to Function in the method specialization. This creates a less-specialized method instance that prevents optimization — leading to heap allocations and ~20x slowdowns.

Critically, **@code_warntype, @code_typed, @code_llvm, and @code_native

penelopeysm

using Mooncake
using Mooncake: CoDual, NoFData, NoRData, zero_fcodual, primal
import Mooncake: rrule!!

foo(x::Vector{Float64}) = map(sin, x)
function rrule!!(::CoDual{typeof(foo)}, x::CoDual{Vector{Float64}})
    x_p, x_fdata = x.x, x.dx
    y = map(sin, x_p)
    function foo_pb!!(dy::Vector{Float64})
        x_fdata .+= map(cos, x_p) .* dy

penelopeysm

Turing.jl @ JuliaCon Paris 2025

Bienvenue!

Turing.jl (and its subpackages) provide a framework for probabilistic programming and Bayesian inference.

Poster

We have a poster on the Friday morning session; you can also find a PDF version here.

penelopeysm

ppt() {
    # Create a PowerPoint theme font XML file for a given font name
    [ -z "$1" ] && { echo "Usage: ppt \"<font name>\" (don't forget to quote fonts with spaces)"; return 1; }
    echo "Creating PowerPoint theme font XML for font: $1. Your admin password may be required."
    fontname_no_space=$(echo "$1" | sed 's/ /_/g')
    OLDPWD=$(pwd)
    PPTDIR='/Applications/Microsoft PowerPoint.app/Contents/Resources/Office Themes/Theme Fonts'
    cd "${PPTDIR}"
    sudo cp 'Calibri.xml' "${fontname_no_space}.xml"
    sudo sed -i '' "s/Calibri/$1/g" "${fontname_no_space}.xml"

penelopeysm

using Distributions

function p(x)
    return pdf(Normal(0, 1), x)
end

function mcmc(p, N)
    samples = []

    # Initial sample