gistfile1.txt

    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
        picker.dismiss(animated: true)
        classificationLabel.text = "Analyzing Image…"
        correctedImageView.image = nil
        
        guard let uiImage = info[UIImagePickerControllerOriginalImage] as? UIImage
            else { fatalError("no image from image picker") }
        guard let ciImage = CIImage(image: uiImage)
            else { fatalError("can't create CIImage from UIImage") }
        let orientation = CGImagePropertyOrientation(uiImage.imageOrientation)
        inputImage = ciImage.applyingOrientation(Int32(orientation.rawValue))

        // Show the image in the UI.
        imageView.image = uiImage

        // Run the rectangle detector, which upon completion runs the ML classifier.
        let handler = VNImageRequestHandler(ciImage: ciImage, orientation: Int32(orientation.rawValue))
        DispatchQueue.global(qos: .userInteractive).async {
            do {
                try handler.perform([self.rectanglesRequest])
            } catch {
                print(error)
            }
        }
    }

 applyingOrientation is deprecated now.
    inputImage = ciImage.applyingOrientation(Int32(orientation.rawValue))

Use the below code:
inputImage = ciImage.oriented(forExifOrientation: Int32(orientation.rawValue))