//scaled image to 28x28
    UIImage *scaledCanvasImage = [self imageWithImage:self.drawingCanvas.image scaledToSize:CGSizeMake(28, 28)];
    self.imageToDetect = [[CIImage alloc]initWithImage:scaledCanvasImage];

    MLModel *ml_model = [[[keras_mnist_cnn alloc] init] model];
    VNCoreMLModel *vnc_core_ml_model = [VNCoreMLModel modelForMLModel: ml_model error:nil];