Add Sparse GP

[ziatdinovmax]

VFE approximation

[codecov-commenter]

Codecov Report

Attention: 23 lines in your changes are missing coverage. Please review.

Comparison is base (5762b1f) 95.53% compared to head (2ad3fa9) 95.20%.

Files	Patch %	Lines
gpax/models/sparse_gp.py	86.36%	12 Missing ⚠️
gpax/utils/utils.py	72.72%	6 Missing ⚠️
tests/test_utils.py	83.87%	5 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #81      +/-   ##
==========================================
- Coverage   95.53%   95.20%   -0.33%     
==========================================
  Files          51       53       +2     
  Lines        3938     4127     +189     
==========================================
+ Hits         3762     3929     +167     
- Misses        176      198      +22     

Flag	Coverage Δ
unittests	95.20% <87.95%> (-0.33%)	⬇️

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