public List <FaceModel> GetFaces(string knownFacePath, string unknownFacePath)
        {
            var knownFaceModels  = FaceModel.Load(knownFacePath, FaceRecognition);
            var unknowFaceModels = FaceModel.Load(unknownFacePath, FaceRecognition);

            RecogniteUnknownFaceModels(knownFaceModels, unknowFaceModels);
            return(unknowFaceModels);
        }