Prepare shape predictor

ObjcWrapperFile

@property (assign) BOOL prepared;

@implementation MLWrapper {
    dlib::shape_predictor sp;
}

- (void)prepare {
    NSString *modelFileName = [[NSBundle mainBundle] pathForResource:@"shape_predictor_68_face_landmarks" ofType:@"dat"];
    std::string modelFileNameCString = [modelFileName UTF8String];
    
    dlib::deserialize(modelFileNameCString) >> sp;
    
    self.prepared = YES;
}