Why do We Need Large Batchsizes in Contrastive Learning? A Gradient-Bias Perspective - Chen, Changyou; Zhang, Jianyi; Xu, Yi; Chen, Liqun; Duan, Jiali; Chen, Yiran; Tran, Son; Zeng, Belinda; Chilimbi, Trishul (Advances in Neural Information Processing Systems, 2022)