TRIP: Accelerating Document-level Multilingual Pre-training via Triangular Document-level Pre-training on Parallel Data Triplets. - Hongyuan Lu; Haoyang Huang; Shuming Ma; Dongdong Zhang 001; Wai Lam; Zhaochuan Gao; Anthony Aue; Arul Menezes; Furu Wei (EMNLP (Findings), 2023)