Online Consistency of the Nearest Neighbor Rule
Keywords: Nearest Neighbor Classification, Online Learning, Smoothed Analysis
TL;DR: The nearest neighbor rule is online consistent under much broader conditions than previously known.
Abstract: In the realizable online setting, a learner is tasked with making predictions for a stream of instances, where the correct answer is revealed after each prediction. A learning rule is online consistent if its mistake rate eventually vanishes. The nearest neighbor rule is fundamental prediction strategy, but it is only known to be consistent under strong statistical or geometric assumptions: the instances come i.i.d. or the label classes are well-separated. We prove online consistency for all measurable functions in doubling metric spaces under the mild assumption that instances are generated by a process that is uniformly absolutely continuous with respect to an underlying finite, upper doubling measure.
Primary Area: Learning theory
Submission Number: 111
Loading