output is NaN

[leeningli]

/*Geometric sequence / func PrepareTrainingData_dengbishulie(n int) [][][]float64 { traindatas := make([][][]float64,0) for i:=0;i<n;i++{ for j:=0;j<n;j++{ traindatas = append(traindatas,[][]float64{[]float64{float64(i),float64(j)},[]float64{float64(ij)}}) } } fmt.Printf("%++v",traindatas) return traindatas }

/main/ n,err := fonet.NewNetwork([]int{2, 1, 1},fonet.LeakyReLU) if err != nil { panic(err.Error()) } trainingdata := PrepareTrainingData_dengbishulie(10)

n.Train(trainingdata,100,0.95,true)
fmt.Println(n.Predict([]float64{2,6}))

------output is NaN why???