func TestCART(t *testing.T) {
fds := "../../testdata/iris/iris.dsv"
ds := tabula.Claset{}
_, e := dsv.SimpleRead(fds, &ds)
if nil != e {
t.Fatal(e)
}
fmt.Println("[cart_test] class index:", ds.GetClassIndex())
// copy target to be compared later.
targetv := ds.GetClassAsStrings()
assert(t, NRows, ds.GetNRow(), true)
// Build CART tree.
CART, e := cart.New(&ds, cart.SplitMethodGini, 0)
if e != nil {
t.Fatal(e)
}
fmt.Println("[cart_test] CART Tree:\n", CART)
// Create test set
testset := tabula.Claset{}
_, e = dsv.SimpleRead(fds, &testset)
if nil != e {
t.Fatal(e)
}
testset.GetClassColumn().ClearValues()
// Classifiy test set
e = CART.ClassifySet(&testset)
if nil != e {
t.Fatal(e)
}
assert(t, targetv, testset.GetClassAsStrings(), true)
}
/*
CountOOBError process out-of-bag data on tree and return error value.
*/
func (runtime *Runtime) CountOOBError(oob tabula.Claset) (
errval float64,
e error,
) {
// save the original target to be compared later.
origTarget := oob.GetClassAsStrings()
if DEBUG >= 2 {
fmt.Println("[cart] OOB:", oob.Columns)
fmt.Println("[cart] TREE:", &runtime.Tree)
}
// reset the target.
oobtarget := oob.GetClassColumn()
oobtarget.ClearValues()
e = runtime.ClassifySet(&oob)
if e != nil {
// set original target values back.
oobtarget.SetValues(origTarget)
return
}
target := oobtarget.ToStringSlice()
if DEBUG >= 2 {
fmt.Println("[cart] original target:", origTarget)
fmt.Println("[cart] classify target:", target)
}
// count how many target value is miss-classified.
runtime.OOBErrVal, _, _ = tekstus.WordsCountMissRate(origTarget, target)
// set original target values back.
oobtarget.SetValues(origTarget)
return runtime.OOBErrVal, nil
}