// TestCSV
func main() {
var reader io.Reader
var err error
if reader, err = os.Open("pima-indians-diabetes.csv"); err != nil {
log.Fatalf("%v", err)
}
handler := &Handler{}
err = db.Import(reader, handler)
targetBool := make([]bool, handler.target.Len())
targetNumeric := make([]float64, handler.target.Len())
for i := 0; i < handler.target.Len(); i++ {
targetBool[i] = handler.target.NumericValue(i) == 1.0
targetNumeric[i] = handler.target.NumericValue(i)
}
if err != nil {
log.Fatal("Import returned error")
}
fmt.Printf("target: %v\n", handler.target)
rf := db.NewRandomForestRegressor(100)
oobScores := rf.Fit(handler.features, handler.target)
auc := db.ROCArea(oobScores, targetBool)
mse := db.MSE(oobScores, targetNumeric)
variance := stats.Variance(targetNumeric)
fmt.Printf("ROCArea: %v MSE: %v Var: %v\n", auc, mse, variance)
}
func TestVariance(test *testing.T) {
x := []float64{1.0, 2.0, 0.0, 5.0}
variance := stats.Variance(x)
expected := 3.5
if variance != expected {
test.Errorf("Expected variance of %g; got %g\n", expected, variance)
}
}