Add default regularization

[codecov[bot]]

Codecov Report

Merging #195 (25145a1) into main (2f99ded) will decrease coverage by 19.36%. The diff coverage is 0.00%.

:exclamation: Current head 25145a1 differs from pull request most recent head 7bd19b9. Consider uploading reports for the commit 7bd19b9 to get more accurate results

@@             Coverage Diff             @@
##             main     #195       +/-   ##
===========================================
- Coverage   72.76%   53.41%   -19.36%     
===========================================
  Files           7        6        -1     
  Lines         437      425       -12     
===========================================
- Hits          318      227       -91     
- Misses        119      198       +79     

Impacted Files	Coverage Δ
src/ensemble.jl	0.00% <0.00%> (-100.00%)	:arrow_down:

... and 6 files with indirect coverage changes

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[ChrisRackauckas]

Test failure looks real

[AnasAbdelR]

Tests pass locally - taking a look