R2-D2: A Modular Baseline for Open-Domain Question Answering Martin Fajcik author Martin Docekal author Karel Ondrej author Pavel Smrz author 2021-11 text Findings of the Association for Computational Linguistics: EMNLP 2021 Marie-Francine Moens editor Xuanjing Huang editor Lucia Specia editor Scott Wen-tau Yih editor Association for Computational Linguistics Punta Cana, Dominican Republic conference publication fajcik-etal-2021-r2-d2 10.18653/v1/2021.findings-emnlp.73 https://aclanthology.org/2021.findings-emnlp.73/ 2021-11 854 870