CoreMLStyleTransfer-Vision.swift

guard let model = try? VNCoreMLModel(for: StyleBlue.init(configuration: config).model) else { return }
let request = VNCoreMLRequest(model: model) { (finishedRequest, error) in
    guard let results = finishedRequest.results as? [VNPixelBufferObservation] else { return }

    guard let observation = results.first else { return }

    DispatchQueue.main.async(execute: {
        self.imageView.image = UIImage(pixelBuffer: observation.pixelBuffer)
    })
}

guard let pixelBuffer: CVPixelBuffer = CMSampleBufferGetImageBuffer(sampleBuffer) else { return }
try? VNImageRequestHandler(cvPixelBuffer: pixelBuffer, options: [:]).perform([request])