V2EX rbf kernel

RBF Kernel

释义 Definition

RBF kernel 指机器学习中的径向基函数核(最常见的是高斯核/Gaussian kernel),是一种衡量两个样本相似度的函数,常用于支持向量机(SVM)、核岭回归等核方法,把数据“隐式”映射到更高维空间以处理非线性关系。常见形式:
\(K(x, x') = \exp(-\gamma \|x-x'\|^2)\)

发音 Pronunciation (IPA)

/r bi f knl/

例句 Examples

We trained an SVM with an RBF kernel.
我们用 RBF 核训练了一个支持向量机。

Because the classes overlap nonlinearly, an RBF kernel often performs better than a linear kernel, but it requires careful tuning of γ and C.
由于类别之间以非线性方式重叠,RBF 核往往比线性核表现更好,但需要仔细调参 γ 和 C。

词源 Etymology

RBFRadial Basis Function(径向基函数) 的缩写;“radial(径向)”强调函数值主要取决于样本间距离 \(\|x-x'\|\)。在实践中,RBF 核通常特指以指数形式衰减的高斯核,因其平滑、通用、对多种非线性边界适配性强而广泛使用。

相关词 Related Words

文学与经典引用 Literary Works

  • Learning with Kernels Bernhard Schlkopf & Alexander J. Smola
  • The Elements of Statistical Learning Trevor Hastie, Robert Tibshirani, Jerome Friedman
  • Pattern Recognition and Machine Learning Christopher M. Bishop
  • Gaussian Processes for Machine Learning Carl E. Rasmussen & Christopher K. I. Williams
  • “Support-Vector Networks” Corinna Cortes & Vladimir Vapnik(经典 SVM 文献中讨论核方法,RBF 核为常用选择之一)
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