merging more changes from the faiss baseline

[alexanderguzhva]

Most of the changes are nits and tiny tweaks or code cleanups. There should be nothing groundbreaking.
/kind improvement

[mergify]

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1. If you're fixing a bug, label it as kind/bug.
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.36%. Comparing base (3c46f4c) to head (15fbd12).
Report is 16 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##           main     #510       +/-   ##
=========================================
+ Coverage      0   72.36%   +72.36%     
=========================================
  Files         0       63       +63     
  Lines         0     4291     +4291     
=========================================
+ Hits          0     3105     +3105     
- Misses        0     1186     +1186     

see 63 files with indirect coverage changes

[liliu-z]

/lgtm

[cydrain]

/approve

[sre-ci-robot]

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[liliu-z]

/kind improvement