yolov8中计算iou的测试代码？

在 YOLOv8 中，计算 IOU 的测试代码主要涉及以下几个步骤：

1. 确定预测框和真实框的位置信息。
2. 计算两个框的面积并得到它们的交集面积。
3. 根据交集面积和两个框的面积，计算 IOU。

下面是一个简单的 Python 代码示例，用于计算两个矩形框之间的 IOU 值：

def iou(box1, box2):
    """
    Calculate the Intersection over Union (IoU) of two bounding boxes.

    Args:
        box1: List with the coordinates of the top-left and bottom-right corners of box1: [x1, y1, x2, y2].
        box2: List with the coordinates of the top-left and bottom-right corners of box2: [x1, y1, x2, y2].

    Returns:
        iou: The IoU value as a float.
    """
    # Calculate the coordinates of the intersection rectangle
    x1 = max(box1, box2)
    y1 = max(box1[1], box2)
    x2 = min(box1, box2)
    y2 = min(box1, box2)

    # If the boxes do not intersect, return 0
    if x2 < x1 or y2 < y1:
        return 0.0

    # Calculate the area of intersection rectangle
    intersection_area = (x2 - x1) * (y2 - y1)

    # Calculate the area of both boxes
    box1_area = (box1 - box1) * (box1 - box1)
    box2_area = (box2 - box2) * (box2 - box2[1])

    # Calculate the intersection over union
    iou = intersection_area / float(box1_area + box2_area - intersection_area)

    return iou