docs: skip BlackJAXNUTS example when blackjax absent (Python matrix)#89
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The Python Version Matrix installs the NumPy-only stack, so scripts/searches/mcmc.py failed with ModuleNotFoundError on the optional blackjax backend. Add a find_spec guard that skips the blackjax section gracefully (print + exit 0) when it is not installed; the example runs in full under the release stack. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Summary
The PyAutoBuild Python Version Matrix installs the NumPy-only stack, so
scripts/searches/mcmc.pyfailed withModuleNotFoundError: No module named 'blackjax'— theBlackJAXNUTSsection needs the optional blackjax package (ships viaautofit[optional]).Adds an
importlib.util.find_spec("blackjax")guard before the NUTS section that skips it gracefully (prints a message andsys.exit(0)) when blackjax is absent. TheEmceeandZeussections above run normally; under the full release stack the whole example runs unchanged.Verification
Ran against a clean 2026.7.9.1 venv (with emcee/zeus, without blackjax): Emcee and Zeus run, then the NUTS section prints the skip message and exits 0.
Scripts Changed
scripts/searches/mcmc.py— backend-absent guard on the NUTS section only. Notebook regenerates from the script on the release build.🤖 Generated with Claude Code