[CI Broken] Dependency incompatibilities with Julia 1.12 and outdated package versions

[ChrisRackauckas-Claude]

Summary

The CI is failing on the master branch due to outdated dependency version constraints in Project.toml. The package's dependencies (CUDA, Flux, NNlib, OMEinsum) are pinned to very old versions that are incompatible with Julia 1.12 and current ecosystem packages.

Failed CI Jobs

Job	Status	Duration	Link
Julia 1 (ubuntu-latest)	❌ Failed	20s	View
Documentation	❌ Failed	20s	View
Downgrade CI (alldeps, 1.10)	❌ Failed	40s	View
Spell Check	❌ Failed	5s	View
Julia 1.6 (ubuntu-latest)	✅ Passed	2m24s	—

Root Cause Analysis

Issue 1: GPUCompiler/CUDA Incompatibility (Primary)

The error message shows:

ERROR: Unsatisfiable requirements detected for package GPUCompiler [61eb1bfa]:
 GPUCompiler log:
 ├─possible versions are: 0.1.0 - 1.7.5 or uninstalled
 ├─restricted by julia compatibility requirements to versions: 1.6.0 - 1.7.5 or uninstalled
 └─restricted by compatibility requirements with CUDA [052768ef] to versions: 0.13.3 - 0.17.3 — no versions left
   └─CUDA log:
     ├─possible versions are: 0.1.0 - 5.9.5 or uninstalled
     ├─restricted to versions 3 by OperatorLearning, leaving only versions: 3.0.0 - 3.13.1

Root cause: The Project.toml specifies:

• CUDA = "3" — but CUDA.jl v3 requires GPUCompiler versions 0.13.3 - 0.17.3
• Julia 1.12 only supports GPUCompiler 1.6.0+
• This creates an unsatisfiable dependency resolution

Issue 2: Outdated Dependency Versions

Current Project.toml [compat] constraints:

CUDA = "3"           # Current: 5.x
FFTW = "1"           # OK
Flux = "0.12, 0.13"  # Current: 0.14+
NNlib = "0.8"        # Current: 0.9+
OMEinsum = "0.6"     # Current: 0.9+
julia = "1.6"        # OK but 1.12+ has issues with these old deps

Issue 3: Spell Check False Positives

The typos check flagged:

• ouptut → output in src/FourierLayer.jl:28 (this is a real typo)
• Missings in docs/Manifest.toml (false positive - Missings.jl is a real Julia package name)

Suggested Fix Approach

1. Update dependency versions in Project.toml:

   [compat]
   CUDA = "5"           # or "4, 5" for broader compatibility
   Flux = "0.14"        # or "0.13, 0.14"
   NNlib = "0.9"
   OMEinsum = "0.8, 0.9"
   julia = "1.10"       # Minimum Julia 1.10 for modern CUDA support

2. Fix the typo in src/FourierLayer.jl:28: ouptut → output

3. Add typos configuration to ignore package names in docs/Manifest.toml:
   Create .typos.toml:

   [files]
   extend-exclude = ["docs/Manifest.toml"]

4. Update Manifest.toml files after updating Project.toml

Impact

• Package cannot be installed on Julia 1.12 (latest stable release)
• Documentation cannot be built
• Downgrade CI fails because constraints are unsatisfiable even with older Julia versions

Related PRs/Issues

This was discovered during CI health check PR #62.

cc @ChrisRackauckas

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