def convert_x_to_bbox(x, score=None):
    """
    Takes a bounding box in the centre form [x,y,s,r] and returns it in the form
      [x1,y1,x2,y2] where x1,y1 is the top left and x2,y2 is the bottom right
    """
    w = np.sqrt(x[2] * x[3])
    h = x[2] / w
    if (score == None):
        return np.array(
            [x[0] - w / 2., x[1] - h / 2., x[0] + w / 2.,
             x[1] + h / 2.]).reshape((1, 4))
    else:
        score = np.array([score])
        return np.array([
            x[0] - w / 2., x[1] - h / 2., x[0] + w / 2., x[1] + h / 2., score
        ]).reshape((1, 5))

    Takes a bounding box in the centre form [x,y,s,r] and returns it in the form
      [x1,y1,x2,y2] where x1,y1 is the top left and x2,y2 is the bottom right
    
ppdet/modeling/mot/tracker/ocsort_tracker.py