docs: fix false 'JAX will also be installed' claim; document [jax] extra#642
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…to 2026.7.22.1 Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Se4scqoA2XQ3UFbPBEo6JP
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01GWfsWWfTugN8biz8T8paRm
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The bug
docs/installation/pip.mdandconda.mdboth stated:This is false.
pip install autolensdoes not install JAX — it is an optional extra:A user following the docs exactly gets no JAX and no indication why. Reported from a real install of
2026.7.22.1.Changes
pip install autolens[jax]instruction in both pip and conda docs.pip install autolensis a valid, working NumPy-only install.[jax]extra installs CPU-only JAX; GPU still needs the JAX guide first.autolens[jax]as the recommended install command, with the JAX-free variant alongside.__version__to2026.7.22.1.Not changed:
2026.4.5.3(historical — the release that dropped Python 3.9–3.11) and2025.10.6.1(legacy pin example).