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FEAT - Add WeightedGroupL2_plus_L1 penalty #207

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Context of the PR

This PR adds a sparse weighted group L2 penalty enabling for instance fitting a sparse group Lasso estimator.

Closes #198

Contributions of the PR

  • add WeightedGroupL2_plus_L1 penalty

Checks before merging PR

  • added documentation for any new feature
  • added unittests
  • edited the what's new

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Badr-MOUFAD commented Nov 9, 2023

For unittest, we need to add support for fix-point distance strategy to build working sets in the GroupBCD solver (later, add it to GroupProxNewton)

I opened an issue #208

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FEAT - implement BlockL2_plus_L1 penalty
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