DEBUG coverage warning [azure parallel]

[ogrisel]

Investigate the warning raised at the end of a pytest run on our CI:

/usr/share/miniconda/envs/testvenv/lib/python3.11/site-packages/coverage/inorout.py:519: CoverageWarning: Module sklearn was previously imported, but not measured (module-not-measured)
  self.warn(msg, slug="module-not-measured")

[github-actions]

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[ogrisel]

The coverage reports seem to be normal. So the warning seems to be phony.