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https://www.netguru.com/blog/on-device-training-with-core-ml-make-your-pancakes-healthy-again

[Apple docs]Personalizing a Model with On-Device Updates

Turi Create API docs

Turi Create Userguide

On-device training with Core ML by Matthijs Hollemans:

• Part 1

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/// header

id CGSCopyManagedDisplaySpaces(int conn);
int _CGSDefaultConnection();
id CGSCopyWindowsWithOptionsAndTags(int conn, unsigned owner, NSArray *spids, unsigned options, unsigned long long *setTags, unsigned long long *clearTags);


// code

int spaceNumber = 0;  // the space you want to get the windows for. numbering starts at 0.

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extension NSFont {
    class func roundedFont(ofSize size: CGFloat, weight: NSFont.Weight) -> NSFont {
        let systemFont = NSFont.systemFont(ofSize: size, weight: weight)
        
        guard let descriptor = systemFont.fontDescriptor.withDesign(.rounded),
              let roundedFont = NSFont(descriptor: descriptor, size: size) else {
                  return systemFont
              }
        return roundedFont
    }

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    func test(with identifier: String = #function, body: (XCTestExpectation) -> Void) {
        let expectation = expectation(description: identifier)
        body(expectation)
        waitForExpectations(timeout: 0.5)
    }
    
    func testAscending() {
        let a = [1]
        
        test { expectation in

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extension UIStackView {
    func setSpacing(_ spacing: CGFloat, after arrangedSubview: UIView) {
        guard let index = arrangedSubviews.firstIndex(of: arrangedSubview) else { return }

        let spaceView = UIView()
        spaceView.translatesAutoresizingMaskIntoConstraints = false

        switch axis {
        case .horizontal:
            spaceView.widthAnchor.constraint(equalToConstant: spacing).isActive = true

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// For views that can be loaded from nib file
protocol NibLoadable {
    // Name of the nib file
    static var nibName: String { get }
    static func createFromNib(in bundle: Bundle) -> Self
}

extension NibLoadable where Self: NSView {

    // Default nib name must be same as class name

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extension NSImage {
    
    func appIcon(h:CGFloat = 35) -> NSImage {
        let size = NSSize(width: h, height: h)
        let cornerRadius: CGFloat = h/5
        guard self.isValid else {
            return self
        }
        let newImage = NSImage(size: size)

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extension NSBezierPath {
    var cgPath: CGPath {
        let path = CGMutablePath()
        var points = [CGPoint](repeating: .zero, count: 3)
        for i in 0 ..< self.elementCount {
            let type = self.element(at: i, associatedPoints: &points)

            switch type {
            case .moveTo:
                path.move(to: points[0])

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class GradientView: UIView {
    var gradientLayer: CAGradientLayer!

    override init(frame: CGRect) {
        super.init(frame: frame)
        commonInit()
    }

    required init?(coder: NSCoder) {
        super.init(coder: coder)