M.A might not be available, you should use M.toarray()

[Zhongzheng99]

In some versions of scipy(e.g. 1.14), M.A might not be available. In such cases, you should use M.toarray() to convert the sparse matrix to a dense one.

[Zhongzheng99]

Closes #412

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 54.60%. Comparing base (9c5a936) to head (7730418).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #410   +/-   ##
=======================================
  Coverage   54.60%   54.60%           
=======================================
  Files          22       22           
  Lines        1683     1683           
=======================================
  Hits          919      919           
  Misses        764      764           

Flag	Coverage Δ
unittests	54.60% <100.00%> (ø)

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Files	Coverage Δ
scib/metrics/utils.py	51.04% <100.00%> (ø)