考虑该问题
\[\min_x f(x)\]$f$ 为凸函数, $\text{dom}(f) = \mathbb{R}^n$。
Subgradient mthod: 选择一个初始值 $x^{(0)} \in \mathbb{R}^n$, 重复:
\[x^{(k)} = x^{(k-1)} - t_k · g^{(k-1)}, \quad k = 1, 2, 3 ...\]其中 $g^{(k-1)} \in \partial f(x^{(k-1)})$ 。
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【机器学习】Proximal Gradient Descent -
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【深度学习】AP-BSN: Self-Supervised Denoising for Real-World Images via Asymmetric PD and Blind-Spot Network