FluxML/Zygote.jl

Unable to differentiate a broadcasted constructor with CUDA array inputs

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#1,528 opened on Oct 3, 2024

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CUDAhelp wanted

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Description

Due to a CUDA bug: https://github.com/JuliaGPU/CUDA.jl/issues/2514, crossposted for reference.

Encountered when differentiating over:

using Distributions
using CUDA
a = cu(ones(5)); b = cu(zeros(5));

Normal.(a, b)

Contributor guide

Research direction
Investigate the CUDA.jl bug referenced and determine if a workaround can be applied in Zygote.jl to handle broadcasted constructors with CUDA arrays.
Tech stack
None
Domain
backend
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Needs investigation
Prerequisites
Julia
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
30