adding a input polyconvex nn and associated testing.

[chamel3]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 64.64%. Comparing base (6d8ad94) to head (45b35b2).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #115      +/-   ##
==========================================
+ Coverage   63.78%   64.64%   +0.85%     
==========================================
  Files          92       93       +1     
  Lines        4134     4211      +77     
==========================================
+ Hits         2637     2722      +85     
+ Misses       1497     1489       -8     

Flag	Coverage Δ
unittests	64.64% <100.00%> (+0.85%)	⬆️

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