Add a standalone BNN

[ziatdinovmax]

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 97.84173% with 3 lines in your changes are missing coverage. Please review.

Project coverage is 95.29%. Comparing base (9284cb5) to head (d82b1b9).
Report is 1 commits behind head on main.

Files	Patch %	Lines
gpax/models/spm.py	84.21%	3 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #91      +/-   ##
==========================================
+ Coverage   95.20%   95.29%   +0.08%     
==========================================
  Files          53       55       +2     
  Lines        4127     4247     +120     
==========================================
+ Hits         3929     4047     +118     
- Misses        198      200       +2     

Flag	Coverage Δ
unittests	95.29% <97.84%> (+0.08%)	⬆️

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