lenskit/batch/_train.py:3:29: F401 `lenskit.sharing.persist` imported but unused

lenskit/topn.py:7:1: F403 `from .metrics.topn import *` used; unable to detect undefined names

lenskit/topn.py:17:2: F405 `bulk_impl` may be undefined, or defined from star imports

lenskit/util/log.py:8:27: F401 `multiprocessing` imported but unused

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Node.js 16 actions are deprecated. Please update the following actions to use Node.js 20: actions/checkout@v2, actions/setup-python@v4. For more information see: https://github.blog/changelog/2023-09-22-github-actions-transitioning-from-node-16-to-node-20/.