sklearn实现knnf分类算法
时间: 2024-01-19 14:03:56 浏览: 71
KNN分类器算法实现
好的,以下是sklearn实现kNN分类算法的步骤:
1. 导入需要的库:
```python
from sklearn.neighbors import KNeighborsClassifier
from sklearn.model_selection import train_test_split
from sklearn.metrics import accuracy_score
```
2. 准备数据集并进行预处理:
```python
# 假设我们有一个数据集 X 和对应的标签 y
X_train, X_test, y_train, y_test = train_test_split(X, y, test_size=0.2, random_state=42)
```
3. 创建KNN分类器:
```python
# 初始化一个KNN分类器,设置n_neighbors参数为5
knn = KNeighborsClassifier(n_neighbors=5)
```
4. 训练模型:
```python
# 训练模型
knn.fit(X_train, y_train)
```
5. 对测试数据进行预测:
```python
# 对测试数据进行预测
y_pred = knn.predict(X_test)
```
6. 计算准确率:
```python
# 计算准确率
accuracy = accuracy_score(y_test, y_pred)
print('Accuracy: {:.2f}%'.format(accuracy*100))
```
以上就是sklearn实现kNN分类算法的步骤,希望能对你有所帮助!
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