sparse: reduce ut execution time

[sparknack]

Reduce ut execution time, which is from 532.62 secs to 46.50 secs on my machine.

[sparknack]

issue: #1039

[mergify]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.01%. Comparing base (3c46f4c) to head (9b09fc2).
Report is 297 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##           main    #1041       +/-   ##
=========================================
+ Coverage      0   73.01%   +73.01%     
=========================================
  Files         0       82       +82     
  Lines         0     7507     +7507     
=========================================
+ Hits          0     5481     +5481     
- Misses        0     2026     +2026     

see 82 files with indirect coverage changes

[alexanderguzhva]

@sparknack is it needed to run 2000 vectors if we have 3000?

[sparknack]

@sparknack is it needed to run 2000 vectors if we have 3000?

3000 is the vector dimension, not the total number of the vectors.

[foxspy]

/lgtm

[sre-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: foxspy, sparknack

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[foxspy]

/kind improvement