fix(cuda): define xp when cupy is installed but CUDA is unavailable#279
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When cupy is installed but cp.cuda.is_available() returns False (e.g. on a CPU-only HPC node with cupy in the shared environment), xp was left undefined, so 'from ultrack.utils.cuda import xp' raised ImportError and broke ultrack.utils.edge — and transitively any ultrack import. Mirror the cupy-not-installed branch and set xp = np here too. Closes #277
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Closes #277
When cupy is installed but
cp.cuda.is_available()returnsFalse(e.g. a CPU-only HPC node with cupy in the shared env),xpwas never assigned, sofrom ultrack.utils.cuda import xpraisedImportErrorand broke anyultrackimport.Mirror the cupy-not-installed branch and set
xp = nphere too.Reproduced the failure locally with a fake
cupymodule whosecuda.is_available()returnsFalse; with the patch,xp is npand the downstream import inultrack.utils.edgesucceeds.