todo: merge AVX-512 version of PQFastScan

[alexanderguzhva]

Faiss PR facebookresearch/faiss#3276

AVX-512 implementation for PQFastScan for QBS.
For local benchmarks on 4th gen Xeon, the QPS is up to 10% higher, mostly for a single query case. But as far as I remember, production cases would show higher performance improvements.

It cannot be cherry-picked or copy-pasted, because Faiss baseline uses #ifdef mechanism for deciding whether to use AVX-512, and Knowhere uses dynamic hooks. Some additional code is needed.

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[alexanderguzhva]

/reopen

[sre-ci-robot]

@alexanderguzhva: Reopened this issue.

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[github-actions]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions. Rotten issues close after 30d of inactivity. Reopen the issue with /reopen.

[alexanderguzhva]

/reopen

[github-actions]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions. Rotten issues close after 30d of inactivity. Reopen the issue with /reopen.