Added comments

CustomVisionMicrosoftToCoreML/ViewController.swift

@@ -31,17 +31,23 @@ class ViewController: UIViewController, AVCaptureVideoDataOutputSampleBufferDele
     }
 
     func configureCamera() {
+
+        //Start capture session
         let captureSession = AVCaptureSession()
         captureSession.sessionPreset = .photo
         captureSession.startRunning()
+
+        // Add input for capture
         guard let captureDevice = AVCaptureDevice.default(for: .video) else { return }
         guard let captureInput = try? AVCaptureDeviceInput(device: captureDevice) else { return }
         captureSession.addInput(captureInput)
 
+        // Add preview layer
         let previewLayer = AVCaptureVideoPreviewLayer(session: captureSession)
         view.layer.addSublayer(previewLayer)
         previewLayer.frame = view.frame
 
+        // Add output for capture
         let dataOutput = AVCaptureVideoDataOutput()
         dataOutput.setSampleBufferDelegate(self, queue: DispatchQueue(label: "videoQueue"))
         captureSession.addOutput(dataOutput)
@@ -50,13 +56,19 @@ class ViewController: UIViewController, AVCaptureVideoDataOutputSampleBufferDele
     // MARK: - AVCaptureVideoDataOutputSampleBufferDelegate
 
     func captureOutput(_ output: AVCaptureOutput, didOutput sampleBuffer: CMSampleBuffer, from connection: AVCaptureConnection) {
-        guard let pixelBuffer: CVPixelBuffer = CMSampleBufferGetImageBuffer(sampleBuffer) else { return }
 
+        // Initialise CVPixelBuffer from sample buffer
+        guard let pixelBuffer: CVPixelBuffer = CMSampleBufferGetImageBuffer(sampleBuffer) else { return }
+
+        //Initialise Core ML model
         guard let handSignsModel = try? VNCoreMLModel(for: HandSigns().model) else { return }
+
+        // Create a Core ML Vision request
         let request =  VNCoreMLRequest(model: handSignsModel) { (finishedRequest, err) in
-
+
+            // Dealing with the result of the Core ML Vision request
             guard let results = finishedRequest.results as? [VNClassificationObservation] else { return }
-            
+
             guard let firstResult = results.first else { return }
             var predictionString = ""
             DispatchQueue.main.async {
@@ -75,7 +87,8 @@ class ViewController: UIViewController, AVCaptureVideoDataOutputSampleBufferDele
                 self.predictionLabel.text = predictionString + "(\(firstResult.confidence))"
             }
         }
-
+
+        // Perform the above request using Vision Image Request Handler
         try? VNImageRequestHandler(cvPixelBuffer: pixelBuffer, options: [:]).perform([request])
     }