Demo 1: build the tree by hand
Choose a split direction and click inside the gold active region to propose a split. The weighted average impurity is shown before you commit it.
—generated points
—active region majority
—points in active region
—current region impurity
—avg impurity of proposal
—proposal status
—left / lower child
—right / upper child
red point / red-majority region
blue point / blue-majority region
active region border