Poom Chiarawongse

Adding a new field to the `Leaf` API to support sample weights

4

I'm thinking of adding support for sample weights, which isn't compatible with the current `Leaf` struct. More specifically, the field `values` in the struct lists every label that falls into...

better `Leaf` and `Ensemble` structs

5

I've implemented GradientBoost and a more efficient version of AdaBoost that interface with `treeregressor` and `treeclassifier` and am now looking to port them to the light-weight front facing structs we...

Some questions about `prune_tree`.

17

The `prune_tree` function for classification trees internally calls `_prune_run` which computes the purity using the zero-one loss. However, decision trees are built using the entropy purity. I'm not sure if...

force/auto-convert to one-hot encoding for categorical features

1

The current implementation uses the lexicographical ordering to calculate splits of string features. But in practice, this is rarely intended since categorical features are by definition unordered (for example, it...