mmT5: Modular Multilingual Pre-Training Solves Source Language Hallucinations Jonas Pfeiffer author Francesco Piccinno author Massimo Nicosia author Xinyi Wang author Machel Reid author Sebastian Ruder author 2023-12 text Findings of the Association for Computational Linguistics: EMNLP 2023 Houda Bouamor editor Juan Pino editor Kalika Bali editor Association for Computational Linguistics Singapore conference publication pfeiffer-etal-2023-mmt5 10.18653/v1/2023.findings-emnlp.132 https://aclanthology.org/2023.findings-emnlp.132/ 2023-12 1978 2008