Draft linear model residual splitting#691

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mnwright wants to merge 6 commits intomasterfrom lmtree

+218-50

Commits on Sep 24, 2023

change Eigen to Armadillo
mnwright
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Commits on Sep 25, 2023

draft version of lm splitting
mnwright
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Commits on Sep 28, 2023

lm with intercept
mnwright
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Commits on Nov 20, 2023

Commits on Nov 21, 2023

handle categorical features
mnwright
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