写一段FCM算法实现的聚类问题的代码
时间: 2024-05-03 11:17:14 浏览: 8
下面是一个简单的FCM算法实现的聚类问题的Python代码:
```python
import numpy as np
from scipy.spatial.distance import cdist
def fcm(data, n_clusters, m=2, max_iters=100, error=1e-5):
n_samples = data.shape[0]
n_features = data.shape[1]
centers = np.random.rand(n_clusters, n_features)
weights = np.random.rand(n_samples, n_clusters)
weights /= np.sum(weights, axis=1)[:, np.newaxis]
for i in range(max_iters):
# 计算聚类中心
centers_old = centers.copy()
for j in range(n_clusters):
centers[j, :] = np.sum((weights[:, j] ** m)[:, np.newaxis] * data, axis=0) / \
np.sum(weights[:, j] ** m)
# 计算权重矩阵
distances = cdist(data, centers)
for j in range(n_clusters):
weights[:, j] = 1 / np.sum((distances[:, j] / distances) ** (2 / (m - 1)), axis=1)
weights /= np.sum(weights, axis=1)[:, np.newaxis]
# 计算误差
if np.linalg.norm(centers - centers_old) < error:
break
return centers, weights
```
这段代码将数据矩阵 `data` 分成 `n_clusters` 个类,并返回每个类的聚类中心和每个样本属于每个类的权重。其中,`m` 是模糊指数,`max_iters` 是最大迭代次数,`error` 是误差容限。在每次迭代中,先根据当前权重矩阵计算每个类的聚类中心,再根据当前聚类中心计算每个样本属于每个类的权重,最后根据当前权重矩阵和聚类中心计算误差。当误差小于误差容限时,停止迭代。