private void start_Click(object sender, EventArgs e)
 {
     if (faceDir.Text != "")
     {
         trainer = Trainer.build(faceDir.Text);
     }
 }
 public static Trainer build(String path)
 {
     var tr = new Trainer();
     tr.walk(path);
     return tr;
 }
 public Form1()
 {
     InitializeComponent();
     trainer = new Trainer();
 }