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arXiv 2103.00667math.OC
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基于次零阶预言机的光滑凸优化

Smooth Convex Optimization using Sub-Zeroth-Order Oracles

Mustafa O. Karabag, Cyrus Neary, Ufuk Topcu

摘要:

我们考虑最小化一个光滑的,Lipschitz,凸函数在一个紧凑的,凸集使用次零阶预言的问题:一个预言,输出的符号的方向导数为一个给定的点和一个给定的方向,一个预言,比较一对给定的点的函数值,和一个预言,输出一个嘈杂的函数值为一个给定的点。我们表明,使用这些预言优化的样本复杂性是多项式的相关参数。我们为比较器oracle提供的优化算法是第一个具有已知收敛速率的算法,该收敛速度在维数上是多项式的。我们还给出了一个算法的噪音值预言,招致遗憾的$\tilde{\mathcal{O}}(n^{3.75} T^{0.75})$(忽略其他因素和对数依赖性),其中$n$是维数和$T$是查询的数量。

英文摘要:

We consider the problem of minimizing a smooth, Lipschitz, convex function over a compact, convex set using sub-zeroth-order oracles: an oracle that outputs the sign of the directional derivative for a given point and a given direction, an oracle that compares the function values for a given pair of points, and an oracle that outputs a noisy function value for a given point. We show that the sample complexity of optimization using these oracles is polynomial in the relevant parameters. The optimization algorithm that we provide for the comparator oracle is the first algorithm with a known rate of convergence that is polynomial in the number of dimensions. We also give an algorithm for the noisy-value oracle that incurs a regret of $\tilde{\mathcal{O}}(n^{3.75} T^{0.75})$ (ignoring the other factors and logarithmic dependencies) where $n$ is the number of dimensions and $T$ is the number of queries.

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