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The Weekly Newsletter of MIT Linguistics

Phonology Circle 10/3 - Aleksei Nazarov

Speaker: Aleksei Nazarov (Harvard)
Title: Learning parametric stress without domain-specific mechanisms
Date/Time: Monday, October 3, 5:00-6:30
Location: 32-D831

(Joint work with Gaja Jarosz (UMass))

A parametric approach to the acquisition of stress (Dresher and Kaye 1990, Hayes 1995) is attractive for defining a small learning space. However, previous approaches (Dresher and Kaye 1990, Pearl 2007, 2011) have argued that domain-general learners, such as the Naïve Parameter Learner (NPL; Yang 2002), are not sufficient for learning stress parameters, and that UG contains domain-specific mechanisms for individual parameters: substantive “cues” as well as a parameter acquisition order. We argue that these conclusions are premature, and we instead propose to modify the non-selective way in which parameters are updated in the NPL.

Our proposed Expectation Driven Parameter Learner (EDPL) augments the NPL with a (linear-time) Expectation Maximization component along the lines of Jarosz (2015). Without using domain-specific mechanisms, we show that the novel EDPL performs very well (96% accuracy) on a representative subset of the typology defined by Dresher and Kaye (1990), while the NPL performs very poorly (4.3% accuracy). This suggests that UG can be kept simpler (parameters only, instead of parameters + cues + order) if the learner is allowed to process individual data points more thoroughly.

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