Addressing machine learning concept drift reveals declining vaccine sentiment during the COVID-19 pandemic
This work highlights a critical issue for researchers and public health officials relying on social media analysis for real-time public opinion tracking, especially during rapidly evolving crises like pandemics.
This paper investigates the impact of concept drift on machine learning models used for analyzing vaccine sentiment on Twitter during the COVID-19 pandemic. It found that pre-pandemic trained algorithms largely failed to detect a considerable decline in vaccine sentiment in 2020 due to this drift.
Social media analysis has become a common approach to assess public opinion on various topics, including those about health, in near real-time. The growing volume of social media posts has led to an increased usage of modern machine learning methods in natural language processing. While the rapid dynamics of social media can capture underlying trends quickly, it also poses a technical problem: algorithms trained on annotated data in the past may underperform when applied to contemporary data. This phenomenon, known as concept drift, can be particularly problematic when rapid shifts occur either in the topic of interest itself, or in the way the topic is discussed. Here, we explore the effect of machine learning concept drift by focussing on vaccine sentiments expressed on Twitter, a topic of central importance especially during the COVID-19 pandemic. We show that while vaccine sentiment has declined considerably during the COVID-19 pandemic in 2020, algorithms trained on pre-pandemic data would have largely missed this decline due to concept drift. Our results suggest that social media analysis systems must address concept drift in a continuous fashion in order to avoid the risk of systematic misclassification of data, which is particularly likely during a crisis when the underlying data can change suddenly and rapidly.