HoughCircles votes output in python

I'm detecting circles using HoughCircles in python and was wondering if anyone know how the get the confidence level (im my understanding the votes vector) when using HoughCircles.

I ran the following code, and the output was (x,y,radius). When trying HOUGH_GRADIENT_ALT instead of HOUGH_GRADIENT output remained (x,y,radius). Thank you.

        a = cv.HoughCircles(imgray, cv.HOUGH_GRADIENT, i, 20,
                    param1=50, param2=30,
                    minRadius=0, maxRadius=40)