方差偏差的分解公式

“`” 参考回答：

<img alt=""img"" referrerpolicy=""no-referrer"" src=""https://uploadfiles.nowcoder.com/images/20190315/311436_1552657794642_70D9683D0250520E07B9658F4EFAF2E4"">为模型的方差

<img alt=""img"" referrerpolicy=""no-referrer"" src=""https://uploadfiles.nowcoder.com/images/20190315/311436_1552657778263_FDA2AD3204D3916726A8A384EEBAE955"">为模型的偏差

<img alt=""img"" referrerpolicy=""no-referrer"" src=""https://uploadfiles.nowcoder.com/images/20190315/311436_1552657764674_5EB836982BE33776C94540D85856C735"">为模型的噪声

<img alt=""img"" referrerpolicy=""no-referrer"" src=""https://uploadfiles.nowcoder.com/images/20190315/311436_1552657750690_3F22F51972376342D2EBD2CA95DC68C6"">为训练集D上学得模型f在x上的输出

<img alt=""img"" referrerpolicy=""no-referrer"" src=""https://uploadfiles.nowcoder.com/images/20190315/311436_1552657732980_355C599386DA6082DADBF255F1950BD4"">为模型的期望预测

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