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# Stable Sample Compression Schemes: New Applications and an Optimal SVM Margin Bound

*Proceedings of the 32nd International Conference on Algorithmic Learning Theory*, PMLR 132:697-721, 2021.

#### Abstract

We analyze a family of supervised learning algorithms based on sample compression schemes that are stable, in the sense that removing points from the training set which were not selected for the compression set does not alter the resulting classifier. We use this technique to derive a variety of novel or improved data-dependent generalization bounds for several learning algorithms. In particular, we prove a new margin bound for SVM, removing a log factor. The new bound is provably optimal. This resolves a long-standing open question about the PAC margin bounds achievable by SVM.