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arXiv 2004.08620cs.LGstat.ML
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机器学习中的优化:分布空间方法

Optimization in Machine Learning: A Distribution Space Approach

National University of Singapore(新加坡国立大学)

Yongqiang Cai, Qianxiao Li, Zuowei Shen

摘要:

我们提出的观点是,在机器学习中遇到的优化问题往往可以被解释为最小化一个凸函数的功能空间,但与非凸约束集引入模型参数化。这一观察使我们能够通过适当的松弛将这些问题作为训练参数上的分布空间中的凸优化问题来解决。我们推导出分布空间问题和原问题之间的一些简单关系,例如,分布空间解至少与原空间中的解一样好。此外,我们开发了一个基于混合分布的数值算法,直接在分布空间中进行近似优化。这种近似的一致性的建立和所提出的算法的数值效果说明了简单的例子。在理论和实践中,该公式为机器学习中的大规模优化提供了一种替代方法。

英文摘要:

We present the viewpoint that optimization problems encountered in machine learning can often be interpreted as minimizing a convex functional over a function space, but with a non-convex constraint set introduced by model parameterization. This observation allows us to repose such problems via a suitable relaxation as convex optimization problems in the space of distributions over the training parameters. We derive some simple relationships between the distribution-space problem and the original problem, e.g. a distribution-space solution is at least as good as a solution in the original space. Moreover, we develop a numerical algorithm based on mixture distributions to perform approximate optimization directly in distribution space. Consistency of this approximation is established and the numerical efficacy of the proposed algorithm is illustrated on simple examples. In both theory and practice, this formulation provides an alternative approach to large-scale optimization in machine learning.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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