Data-efficient Active Learning for Structured Prediction with Partial Annotation and Self-Training
Submission Type: Regular Long Paper
Submission Track: Syntax, Parsing and their Applications
Submission Track 2: Machine Learning for NLP
Keywords: Active Learning, Structured Prediction, Partial Annotation, Self-training
TL;DR: Exploring Better Active Learning Strategies for Structured Prediction
Abstract: In this work we propose a pragmatic method that reduces the annotation cost for structured label spaces using active learning. Our approach leverages partial annotation, which reduces labeling costs for structured outputs by selecting only the most informative sub-structures for annotation. We also utilize self-training to incorporate the current model’s automatic predictions as pseudo-labels for un-annotated sub-structures. A key challenge in effectively combining partial annotation with self-training to reduce annotation cost is determining which sub-structures to select to label. To address this challenge, we adopt an error estimator to adaptively decide the partial selection ratio according to the current model’s capability. In evaluations spanning four structured prediction tasks, we show that our combination of partial annotation and self-training using an adaptive selection ratio reduces annotation cost over strong full annotation baselines under a fair comparison scheme that takes reading time into consideration.
Submission Number: 2261
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