def METHOD_NAME(self, box, unclip_ratio=1.5):
    poly = Polygon(box)
    distance = poly.area * unclip_ratio / (poly.length)
    offset = pyclipper.PyclipperOffset()
    offset.AddPath(box, pyclipper.JT_ROUND, pyclipper.ET_CLOSEDPOLYGON)
    expanded = np.array(offset.Execute(distance))
    return expanded