混淆矩阵计算准确率代码python

混淆矩阵计算准确率的Python代码如下所示：

def calculate_accuracy(confusion_matrix):
    correct_predictions = sum(confusion_matrix[i][i] for i in range(len(confusion_matrix)))
    total_predictions = sum(sum(row) for row in confusion_matrix)
    accuracy = correct_predictions / total_predictions
    return accuracy

# 示例混淆矩阵
confusion_matrix = [
    [10, 2, 4],
    [3, 15, 2],
    [1, 4, 12]
]

# 调用函数计算准确率
accuracy = calculate_accuracy(confusion_matrix)
print("准确率: {:.2f}%".format(accuracy * 100))