Hierarchical Attention Network for Explainable Depression Detection on Twitter Aided by Metaphor Concept Mappings
This work addresses the need for credible explanations in high-stakes mental health diagnosis on social media, though it appears incremental by combining existing attention mechanisms with metaphor inputs.
The authors tackled the problem of explainable depression detection on Twitter by proposing a hierarchical attention network that incorporates metaphor concept mappings, enabling both detection and identification of relevant tweet features and metaphors.
Automatic depression detection on Twitter can help individuals privately and conveniently understand their mental health status in the early stages before seeing mental health professionals. Most existing black-box-like deep learning methods for depression detection largely focused on improving classification performance. However, explaining model decisions is imperative in health research because decision-making can often be high-stakes and life-and-death. Reliable automatic diagnosis of mental health problems including depression should be supported by credible explanations justifying models' predictions. In this work, we propose a novel explainable model for depression detection on Twitter. It comprises a novel encoder combining hierarchical attention mechanisms and feed-forward neural networks. To support psycholinguistic studies, our model leverages metaphorical concept mappings as input. Thus, it not only detects depressed individuals, but also identifies features of such users' tweets and associated metaphor concept mappings.