// Predict outputs a base.Instances containing predictions from this tree
func (d *DecisionTreeNode) Predict(what *base.Instances) *base.Instances {
outputAttrs := make([]base.Attribute, 1)
outputAttrs[0] = what.GetClassAttr()
predictions := base.NewInstances(outputAttrs, what.Rows)
for i := 0; i < what.Rows; i++ {
cur := d
for {
if cur.Children == nil {
predictions.SetAttrStr(i, 0, cur.Class)
break
} else {
at := cur.SplitAttr
j := what.GetAttrIndex(at)
if j == -1 {
predictions.SetAttrStr(i, 0, cur.Class)
break
}
classVar := at.GetStringFromSysVal(what.Get(i, j))
if next, ok := cur.Children[classVar]; ok {
cur = next
} else {
var bestChild string
for c := range cur.Children {
bestChild = c
if c > classVar {
break
}
}
cur = cur.Children[bestChild]
}
}
}
}
return predictions
}
