Core Concepts
Returning the majority vote of three ERM classifiers is an optimal and simple algorithm in PAC learning.
Abstract
The content discusses the development of an optimal PAC learning algorithm, focusing on the Majority-of-Three approach. It compares this algorithm with other methods, analyzes its error bounds, and conjectures its optimality. The article provides detailed proofs and technical explanations to support its claims.
Introduction:
- Discusses the resolution of the open problem in developing an optimal PAC learning algorithm.
- Introduces the concept of realizable PAC learning and empirical risk minimization (ERM).
Main Results:
- Presents Theorem 1.1 showing that Majority-of-Three achieves optimal expectation bound.
- Introduces Theorem 1.2 providing a high-probability upper bound on the error of Majority-of-Three.
Alternative Algorithms:
- Mentions Simon's alternative algorithm based on majority votes of ERMs.
Notation:
- Defines various sets and intervals used in the analysis.
Lower Bound Analysis:
- Proves Theorem 1.4 showing that not all majorities of three ERMs are optimal.
High Probability Upper Bound:
- Demonstrates Theorem 1.2 proving a high-probability upper bound for Majority-of-Three's error.
Stats
Hanneke [Han16a] proposed first optimal algorithm with error upper bound matching (2)
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