Validate the result of a CoreML request

result.swift

public func handleClassification(request: VNRequest, error: Error?) {
  guard let observations = request.results as? [VNClassificationObservation]
    else { fatalError("unexpected result type from VNCoreMLRequest") }
        
  guard let best = observations.first else {
    fatalError("classification didn't return any results")
  }
        
  DispatchQueue.main.async {
    if best.identifier.starts(with: "Unknown") || best.confidence < 0.50 {
      print("Mhm, no cat or absolutely not sure about it's mood")
    } else {
      print("This cat seem to be in a \(best.identifier) mood (\(best.confidence) sure"
    }
  }
}