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MPSBoost 1.0.0 Known-Issue Audit

No blocking customer-facing issue is recorded for the 1.0.0 release gate.

Accepted Boundaries

  • HIGGS remains an opt-in local-file performance-boundary dataset. It is not packaged or automatically downloaded because the raw dataset is too large for ordinary customer installs.
  • Official SHAP execution requires the explicit mpsboost[shap] extra and semantic-validation path. Approximate explanations remain labeled approximate.
  • Linux CPU/CUDA operation uses explicit external sklearn/XGBoost/CUDA backend policy and records requested/effective backend decisions.
  • Workloads that are more suitable for CPU warn and continue on CPU when users request MPS.

Customer Experience Requirements

  • Missing Metal or MPS environment: warning plus copy-paste setup commands.
  • CPU-only workers: MPSBOOST_SKIP_ENV_CHECK=1.
  • Missing optional dependency: copy-paste pip install 'mpsboost[extra]' command.
  • External backend runtime issue: clear attribution to the selected external stack while native CPU remains usable when possible.