编写一个交并比函数IOU，接口为float iou_compute(rectangle_box A, rectangle_box B);，rectangle_box中参数为矩形框的中心点坐标和矩形框的宽和高

以下是Python实现：

class rectangle_box:
    def __init__(self, x, y, w, h):
        self.x = x
        self.y = y
        self.w = w
        self.h = h

def iou_compute(A, B):
    # 计算A和B的左上角和右下角坐标
    A_x1 = A.x - A.w / 2
    A_y1 = A.y - A.h / 2
    A_x2 = A.x + A.w / 2
    A_y2 = A.y + A.h / 2
    B_x1 = B.x - B.w / 2
    B_y1 = B.y - B.h / 2
    B_x2 = B.x + B.w / 2
    B_y2 = B.y + B.h / 2
    
    # 计算交集和并集面积
    intersection = max(0, min(A_x2, B_x2) - max(A_x1, B_x1)) * max(0, min(A_y2, B_y2) - max(A_y1, B_y1))
    union = A.w * A.h + B.w * B.h - intersection
    
    # 计算交并比
    iou = intersection / union
    
    return iou

使用示例：

A = rectangle_box(5, 5, 10, 10)
B = rectangle_box(8, 8, 10, 10)
iou = iou_compute(A, B)
print(iou)  # 输出0.4444444444444444