“`” 参考回答：
<img alt=""img"" referrerpolicy=""no-referrer"" src=""https://uploadfiles.nowcoder.com/images/20190315/311436_1552626089733_EB784B94FB36F1E16AAE13E0CE1F5528"">
M为样本个数,<img alt=""img"" referrerpolicy=""no-referrer"" src=""https://uploadfiles.nowcoder.com/images/20190315/311436_1552626118579_D581EA43F697A6D164D115262A358531"">为模型对样本i的预测结果,<img alt=""img"" referrerpolicy=""no-referrer"" src=""https://uploadfiles.nowcoder.com/images/20190315/311436_1552626133875_EB21E7E055CC9CDB4E2300AF5B6BC300"">为样本i的真实标签。
<pre><code> "“`
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