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Add feature importances to DecisionTreeRegressor, RandomForestRegressor and ExtraTreesRegressor - #497

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slievens wants to merge 9 commits into

smartcorelib:mainfrom

slievens:feature-importances

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Add feature importances to DecisionTreeRegressor, RandomForestRegressor and ExtraTreesRegressor#497
slievens wants to merge 9 commits into
smartcorelib:mainfrom
slievens:feature-importances

Commits on Oct 14, 2026
- Use MSE criterion in base tree regressor
  slievens
  committed
  39f64c1
Commits on Oct 15, 2026
- No leaf has a split_score.
  slievens
  committed
  ce1ee48
- Remove gini and tests
  slievens
  committed
  6505833
- Clamp mass residue to zero
  slievens
  committed
  d4e67bc
Commits on Oct 17, 2026
- Merge 'always-shuffle'
  slievens
  committed
  be58518
Commits on Oct 18, 2026
- Use a stable MSE improvement and drop zero-mass rows
  slievens
  committed
  e7a8008
- Refactor grow
  slievens
  committed
  501e5d5
- update changelog
  slievens
  committed
  c7eb8a3
Commits on Oct 20, 2026
- Add feature importances to the regression trees and forests
  slievens
  committed
  c34b214