Vision-ImageSimilarityRequest.swift

func processImages()
    {
        
        guard self.modelData.count > 0 else{
            return
        }
        
        var observation : VNFeaturePrintObservation?
        var sourceObservation : VNFeaturePrintObservation?
    
        sourceObservation = featureprintObservationForImage(image: UIImage(named: sourceImage)!)
        
        var tempData = modelData
        
        tempData = modelData.enumerated().map { (i,m) in
            var model = m
            if let uiimage = UIImage(named: model.imageName){
                observation = featureprintObservationForImage(image: uiimage)
                
                do{
                    var distance = Float(0)
                    if let sourceObservation = sourceObservation{
                        try observation?.computeDistance(&distance, to: sourceObservation)
                        model.distance = "\(distance)"
                    }
                }catch{
                    print("errror occurred..")
                }
                
            }
            
            return model
        }
        
        modelData = tempData.sorted(by: {Float($0.distance)! < Float($1.distance)!})
    }