def plot_confusion_matrix(cm, classes, title='Confusion matrix', cmap=plt.cm.Blues, normalize=False):
时间: 2024-05-02 10:16:11 浏览: 188
Confusion Matrix in Python plot a pretty confusion matrix
该函数用于绘制混淆矩阵图,其中参数含义为:
- cm:混淆矩阵数组。
- classes:类别标签数组。
- title:图像标题。
- cmap:颜色映射。
- normalize:是否对混淆矩阵进行归一化处理。
具体实现代码如下:
```python
import matplotlib.pyplot as plt
import numpy as np
def plot_confusion_matrix(cm, classes, title='Confusion matrix', cmap=plt.cm.Blues, normalize=False):
"""
This function prints and plots the confusion matrix.
Normalization can be applied by setting `normalize=True`.
"""
if normalize:
cm = cm.astype('float') / cm.sum(axis=1)[:, np.newaxis]
print("Normalized confusion matrix")
else:
print('Confusion matrix, without normalization')
print(cm)
plt.imshow(cm, interpolation='nearest', cmap=cmap)
plt.title(title)
plt.colorbar()
tick_marks = np.arange(len(classes))
plt.xticks(tick_marks, classes, rotation=45)
plt.yticks(tick_marks, classes)
fmt = '.2f' if normalize else 'd'
thresh = cm.max() / 2.
for i, j in itertools.product(range(cm.shape[0]), range(cm.shape[1])):
plt.text(j, i, format(cm[i, j], fmt),
horizontalalignment="center",
color="white" if cm[i, j] > thresh else "black")
plt.tight_layout()
plt.ylabel('True label')
plt.xlabel('Predicted label')
plt.show()
```
其中,还需导入 itertools 库。
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