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Chen Yin-Chen

Business Design Department, Chung Yuan Christian University
Zishen Technology

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AI 實驗室 · 理論概念

梯度下降

在損失山谷往下走:梯度指路,學習率決定步幅。

怎麼玩

訓練模型=在「損失山谷」找最低點。梯度告訴你往哪邊下坡;學習率決定一步跨多遠。 按「走一步」或自動下山,觀察學習率太大時的震盪。

w=-1.00參數 w →損失 L

目前損失 L(w)

4.475

梯度 ∂L/∂w

-1.854

已走步數

0

更新規則:w ← w − η · ∇L(w)