V2EX squared error

Squared Error

释义 Definition

平方误差:指“误差(预测值与真实值之差)”的平方,常用作衡量预测偏差大小的指标与损失函数形式。由于平方会放大较大的偏差,平方误差对“离谱的大错误”更敏感。(相关常见扩展:均方误差 mean squared error, MSE。)

发音 Pronunciation (IPA)

/skwerd err/

例句 Examples

The model tries to minimize squared error.
该模型试图最小化平方误差。

When training a regression model, using squared error as the loss function often leads to solutions equivalent to least squares under common assumptions.
在训练回归模型时,把平方误差作为损失函数在一些常见假设下往往会得到与最小二乘法等价的解。

词源 Etymology

squared 来自动词 square(“使成平方/求平方”),表示“平方后的”;error 表示“误差/错误”。组合成 squared error,字面义即“误差的平方”。这一表达在统计学、数值分析与机器学习中广泛使用,用于把误差转换为非负量并便于求和、优化。

相关词 Related Words

文学与著名作品 Notable Works

  • The Elements of Statistical Learning(Hastie, Tibshirani, Friedman)在回归与损失函数讨论中使用平方误差/平方误差损失。
  • Pattern Recognition and Machine Learning(Christopher M. Bishop)在回归模型与误差度量部分涉及平方误差。
  • Numerical Recipes(Press 等)在数据拟合、最小二乘与误差度量相关章节出现平方误差概念。
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