Use expm1 instead of exp - 1

[kit1980]

Similarly to #2540 and #2541: use more numerically stable expm1.

Found with TorchFix https://github.com/pytorch-labs/torchfix/. This should be the last instance to replace in the current codebase.

[saitcakmak]

Thanks! Happy to stamp the diff after you import it to fbsource

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@kit1980 has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.98%. Comparing base (7715ff4) to head (c300c83).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2660   +/-   ##
=======================================
  Coverage   99.98%   99.98%           
=======================================
  Files         200      200           
  Lines       18155    18155           
=======================================
  Hits        18153    18153           
  Misses          2        2           

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@kit1980 merged this pull request in 466da73.