OCHADAI at SMM4H-2021 Task 5: Classifying self-reporting tweets on potential cases of COVID-19 by ensembling pre-trained language models Ying Luo author Lis Pereira author Kobayashi Ichiro author 2021-06 text Proceedings of the Sixth Social Media Mining for Health (#SMM4H) Workshop and Shared Task Arjun Magge editor Ari Klein editor Antonio Miranda-Escalada editor Mohammed Ali Al-garadi editor Ilseyar Alimova editor Zulfat Miftahutdinov editor Eulalia Farre-Maduell editor Salvador Lima Lopez editor Ivan Flores editor Karen O’Connor editor Davy Weissenbacher editor Elena Tutubalina editor Abeed Sarker editor Juan M Banda editor Martin Krallinger editor Graciela Gonzalez-Hernandez editor Association for Computational Linguistics Mexico City, Mexico conference publication luo-etal-2021-ochadai 10.18653/v1/2021.smm4h-1.25 https://aclanthology.org/2021.smm4h-1.25/ 2021-06 123 125