Python画混淆矩阵热力图(简单示例)

混淆矩阵热力图如下所示:
Python画混淆矩阵热力图(简单示例)_第1张图片
代码如下:

import seaborn as sn  #画图模块
from sklearn.metrics import confusion_matrix

def plot_matrix(y_true, y_pred,title_name):
    cm = confusion_matrix(y_true, y_pred)#混淆矩阵
    #annot = True 格上显示数字 ,fmt:显示数字的格式控制
    ax = sn.heatmap(cm,annot=True,fmt='g',xticklabels=['1', '2', '3'],yticklabels=['1', '2', '3'])
    #xticklabels、yticklabels指定横纵轴标签
    ax.set_title(title_name) #标题
    ax.set_xlabel('predict') #x轴
    ax.set_ylabel('true') #y轴

#调用函数画图
plot=plot_matrix(T_test,adb_pre,'example-confusion matrix')
#T_test是真实值:[2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3]
#adb_pre预测值:[3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3]

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