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KPCA codes

于 2022-03-19 发布 文件大小:2.03 kB
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KPCA的基本思想是首先将低维输入空间中各变量之间的非线性关系通过非线性映射映射到高维特征空间中,然后在高维特征空间中进行主元分析,求取数据在非 线性主元上的投影。这一非线性映射的具体形式并不需要求取,是通过适当的内积函数实现的,这种内积函数可以诱导出从原始输入空间到高维特征空间的隐含映射(核 函数),因此称作核函数主元分析。通过选取不同形式的核函数,就可以处理大量的非线性问题。

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