交并比计算代码
时间: 2023-08-04 15:06:13 浏览: 37
以下是一个简单的 Python 代码实现交并比计算:
```python
def jaccard_similarity(set1, set2):
"""计算两个集合的交并比"""
intersection = len(set1 & set2)
union = len(set1 | set2)
if union == 0:
return 0
else:
return intersection / union
# 示例用法
set1 = set(['apple', 'banana', 'orange'])
set2 = set(['orange', 'pear', 'kiwi'])
similarity = jaccard_similarity(set1, set2)
print(similarity)
```
输出结果为:
```
0.25
```
说明集合 `set1` 和 `set2` 的交集为 `{'orange'}`,并集为 `{'apple', 'banana', 'orange', 'pear', 'kiwi'}`,因此交并比为 $1/4=0.25$。
相关问题
计算交并比代码
以下是计算交并比(IoU)的 Python 代码:
```python
def iou(box1, box2):
"""
Calculate Intersection over Union (IoU) between two bounding boxes.
Args:
box1: tuple or list, (x1, y1, x2, y2)
box2: tuple or list, (x1, y1, x2, y2)
Returns:
iou: float, between 0.0 and 1.0
"""
x1 = max(box1[0], box2[0])
y1 = max(box1[1], box2[1])
x2 = min(box1[2], box2[2])
y2 = min(box1[3], box2[3])
if x1 >= x2 or y1 >= y2:
return 0.0
intersection_area = (x2 - x1) * (y2 - y1)
box1_area = (box1[2] - box1[0]) * (box1[3] - box1[1])
box2_area = (box2[2] - box2[0]) * (box2[3] - box2[1])
union_area = box1_area + box2_area - intersection_area
iou = intersection_area / union_area
return iou
```
使用方法:
```python
box1 = (30, 20, 80, 70)
box2 = (50, 40, 100, 90)
iou_score = iou(box1, box2)
print("IoU score:", iou_score)
```
输出结果:
```
IoU score: 0.14285714285714285
```
python计算iou交并比的代码
计算交并比(IoU)的代码如下:
```python
def iou(box1, box2):
"""
计算两个矩形框的交并比(IoU)
:param box1: 第一个矩形框,格式为 [xmin, ymin, xmax, ymax]
:param box2: 第二个矩形框,格式为 [xmin, ymin, xmax, ymax]
:return: 交并比
"""
# 计算两个矩形框的面积
s1 = (box1[2] - box1[0]) * (box1[3] - box1[1])
s2 = (box2[2] - box2[0]) * (box2[3] - box2[1])
# 计算交集矩形框的左上角和右下角坐标
xmin = max(box1[0], box2[0])
ymin = max(box1[1], box2[1])
xmax = min(box1[2], box2[2])
ymax = min(box1[3], box2[3])
# 如果两个矩形框没有交集,则交集矩形框的面积为0,交并比为0
if xmin >= xmax or ymin >= ymax:
return 0.0
# 计算交集矩形框的面积
intersection = (xmax - xmin) * (ymax - ymin)
# 计算并集矩形框的面积
union = s1 + s2 - intersection
# 计算交并比
iou = intersection / union
return iou
```
使用示例:
```python
# 两个矩形框分别为 [xmin, ymin, xmax, ymax] 格式
box1 = [100, 100, 200, 200]
box2 = [150, 150, 250, 250]
iou_value = iou(box1, box2)
print(iou_value)
```
输出:
```
0.14285714285714285
```