Better Hypothesis Testing for Statistical Machine Translation: Controlling for Optimizer Instability

In statistical machine translation, a researcher seeks to determine whether some innovation (e.g., a new feature, model, or inference algorithm) improves translation quality in comparison to a baseline system. To answer this question, he runs an experiment to evaluate the behavior of the two systems on held-out data. In this paper, we consider how to make such experiments more statistically reliable. We provide a systematic analysis of the effects of optimizer instability—an extraneous variable that is seldom controlled for—on experimental outcomes, and make recommendations for reporting results more accurately.

• Type: Journal
• Year: 2011
• Where: ACL
• Authors: Jonathan H. Clark, Chris Dyer, Alon Lavie, Noah A. Smith
• Keywords: ACL 2011, Baseline System, Computational Linguistics, Inference Algorithm, Statistical Machine Translation