Although recent neural models for coreference resolution have led to substantial improvements on benchmark datasets, transferring these models to new target domains containing out-of-vocabulary spans and requiring differing annotation schemes remains challenging.Typical approaches involve continued training on annotated target-domain data, but obtaining annotations is costly and time-consuming.We show that annotating mentions alone is nearly twice as fast as annotating full coreference chains.Accordingly, we propose a method for efficiently adapting coreference models, which includes a high-precision mention detection objective and requires annotating only mentions in the target domain.Extensive evaluation across three English coreference datasets: CoNLL-2012 (news/conversation), i2b2/VA (medical notes), and previously unstudied child welfare notes, reveals that our approach facilitates annotation-efficient transfer and results in a 7-14% improvement in average F1 without increasing annotator time 1 .

Drug use reporting is often a bottleneck for modern public health surveillance; social media data provides a real-time signal which allows for tracking and monitoring opioid overdoses. In this work we focus on text-based feature construction for the prediction task of opioid overdose rates at the county level. More specifically, using a Twitter dataset with over 3.4 billion tweets, we explore semantic features, such as topic features, to show that social media could be a good indicator for forecasting opioid overdose crude rates in public health monitoring systems. Specifically, combining topic and TF-IDF features in conjunction with demographic features can predict opioid overdose rates at the county level.

The effectiveness of social media-based prediction highly depends on whether we can construct effective content-based features based on social media text data. Features constructed based on topics learned using a topic model are very attractive due to their expressiveness in semantic representation and accommodation of inexact matching of semantically related words. We develop a novel general framework for constructing multi-attribute topic features using multi-views of the text data defined according to metadata attributes and study their effectiveness for a text-based prediction task. Furthermore we propose and study multiple weighting strategies to align text-based features and prediction outcomes. We evaluate the proposed method on a Twitter corpus of over 100 million tweets collected over a seven year period in 2009-2015 to predict human immunodeficiency virus (HIV) new diagnosis and other sexually transmitted infections (STIs) new diagnosis in the United States at the zipcode-level and county-level resolutions. The results show that feature representations based on attributes such as authors, locations, and hashtags are generally more effective than the conventional topic feature representation.