Merging some old code before switching from master to main

[QB3]

• harmonizing first-order methods in examples

[codecov-commenter]

Codecov Report

Merging #132 (b71ec72) into master (6c84233) will increase coverage by 0.02%.
The diff coverage is 86.66%.

@@            Coverage Diff             @@
##           master     #132      +/-   ##
==========================================
+ Coverage   81.80%   81.83%   +0.02%     
==========================================
  Files          42       42              
  Lines        3347     3352       +5     
  Branches      353      353              
==========================================
+ Hits         2738     2743       +5     
  Misses        511      511              
  Partials       98       98              

Flag	Coverage Δ
unittests	∅ <ø> (∅)

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Impacted Files	Coverage Δ
sparse_ho/ho.py	50.00% <ø> (ø)
sparse_ho/models/svm.py	71.36% <50.00%> (ø)
sparse_ho/utils_plot.py	68.75% <90.90%> (+1.64%)	⬆️
sparse_ho/algo/implicit.py	96.96% <100.00%> (+0.09%)	⬆️

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