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confidence value and threshold in opencv

What is the difference between "confidence" value in Face Recognizer predict method and "threshold" in model consrtuctor?

I want to just grab the LBP histogram from the source image and compare it with the previous stored LBP Histograms and I want a probabilistic match. Like top three matches. I am presently grabbing the LBP Histogram through train method and I want a set of distances from the predict method not just a single predicted label.