Detecting Foodborne Illness Complaints in Multiple Languages Using English Annotations Only

TL;DR

This paper proposes a multilingual foodborne illness detection method using English annotations only, leveraging machine translation and joint training with mBERT to improve cross-lingual performance in social media reviews.

Contribution

It introduces a novel approach combining machine translation and multilingual BERT training to detect foodborne illness complaints across multiple languages without additional annotations.

Findings

Machine translation improves cross-lingual detection accuracy.

Joint training with translated data enhances performance in target languages.

Effective detection demonstrated in seven languages on Yelp reviews.

Abstract

Health departments have been deploying text classification systems for the early detection of foodborne illness complaints in social media documents such as Yelp restaurant reviews. Current systems have been successfully applied for documents in English and, as a result, a promising direction is to increase coverage and recall by considering documents in additional languages, such as Spanish or Chinese. Training previous systems for more languages, however, would be expensive, as it would require the manual annotation of many documents for each new target language. To address this challenge, we consider cross-lingual learning and train multilingual classifiers using only the annotations for English-language reviews. Recent zero-shot approaches based on pre-trained multi-lingual BERT (mBERT) have been shown to effectively align languages for aspects such as sentiment. Interestingly, we show that those approaches are less effective for capturing the nuances of foodborne illness, our public health application of interest. To improve performance without extra annotations, we create artificial training documents in the target language through machine translation and train mBERT jointly for the source (English) and target language. Furthermore, we show that translating labeled documents to multiple languages leads to additional performance improvements for some target languages. We demonstrate the benefits of our approach through extensive experiments with Yelp restaurant reviews in seven languages. Our classifiers identify foodborne illness complaints in multilingual reviews from the Yelp Challenge dataset, which highlights the potential of our general approach for deployment in health departments.