feat: skip update_stretch() when rho = 0

[john-halloran]

The program now acts like regular NMF when rho = 0 and I've confirmed the results match ordinary sckit-learn.decomposition.NMF. Should be handy for comparison.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (john-development@d18b930). Learn more about missing BASE report.

Additional details and impacted files

@@                 Coverage Diff                 @@
##             john-development     #179   +/-   ##
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  Coverage                    ?   77.50%           
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  Files                       ?        3           
  Lines                       ?       40           
  Branches                    ?        0           
===================================================
  Hits                        ?       31           
  Misses                      ?        9           
  Partials                    ?        0           

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[john-halloran]

I'm confused why it thinks the line length is >79 when locally, it is not and my black checks are passing okay. Could it be reformatting or pulling from a different version?

[sbillinge]

it's likely uncorrected code in the main branch. pre-commit locally by default just runs on the files that have been modified, but in ci it runs --all-files. You will have to do that locally to find the others to fix probably.

I am not sure that this is what is happening but probably.

[john-halloran]

Somehow this got dirtied up so I will redo it.