Fix WeightedMinHash input mutation

[dipeshbabu]

Summary

Fixes a mutation bug in WeightedMinHashGenerator.minhash() where passing a np.float32 input array with zero values caused the caller-owned array to be modified in place.

The method replaces zero entries with NaN internally before taking logs. For existing float32 numpy arrays, the code reused the caller’s array directly, so zeros in the original input became NaN after calling minhash().

Fix

• Copy float32 numpy inputs before applying the internal zero-to-NaN transformation.
• Add a regression test to confirm minhash() does not mutate float32 input arrays.

Tests

python -m pytest -o addopts= test/test_weighted_minhash.py
python -m pytest -o addopts= test/test_minhash.py test/test_hyperloglog.py test/test_lshforest.py

[codecov-commenter]

⚠️ Please install the to ensure uploads and comments are reliably processed by Codecov.

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (master@c7c8df0). Learn more about missing BASE report.
❗ Your organization needs to install the Codecov GitHub app to enable full functionality.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #317   +/-   ##
=========================================
  Coverage          ?   66.97%           
=========================================
  Files             ?       21           
  Lines             ?     2616           
  Branches          ?        0           
=========================================
  Hits              ?     1752           
  Misses            ?      864           
  Partials          ?        0           

Flag	Coverage Δ
unittests	66.97% <100.00%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[gemini-code-assist]

Code Review

This pull request ensures that the input array v in the minhash method of WeightedMinHashGenerator is copied when it is already of type float32, preventing unintended mutation of the original input. A corresponding test case has been added to verify this behavior. I have no feedback to provide.