<?xml version="1.0" encoding="utf-8" ?><rss version="2.0"><channel><title><![CDATA[aabbccas的博客]]></title><description><![CDATA[]]></description><link>https://blog.youkuaiyun.com/aabbccas</link><language>zh-cn</language><generator>https://blog.youkuaiyun.com/</generator><copyright><![CDATA[Copyright &copy; aabbccas]]></copyright><item><title><![CDATA[为什么沿梯度反方向下降最快]]></title><link>https://blog.youkuaiyun.com/aabbccas/article/details/139719975</link><guid>https://blog.youkuaiyun.com/aabbccas/article/details/139719975</guid><author>aabbccas</author><pubDate>Sun, 16 Jun 2024 16:49:33 +0800</pubDate><description><![CDATA[梯度下降是优化目标函数的核心方法。通过数学推导表明：在任意点θ₀处，沿负梯度方向-∇J(θ₀)更新参数θ₁=θ₀-ε∇J(θ₀)，可使函数值最快下降ε∥∇J(θ₀)∥²。方向导数证明，该方向使函数值下降速率最大，其他方向的下降量均不及梯度反方向。泰勒展开显示，这种更新确保每次迭代都最大程度降低目标函数值。梯度下降法通过利用梯度信息，高效寻找最优解。]]></description><category></category></item><item><title><![CDATA[Ubuntu18.04与jetson 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