Before revision:  However, recent approaches like  BYOL and SimSiam , show remarkable performance {\it without} negative pairs, raising a fundamental theoretical question : how can SSL with only positive pairs avoid representational collapse ?
After revision:  However, recent approaches likenon-contrastive BYOL and SimSiam , show remarkable performance {\it without} negative pairs, raising a fundamental theoretical question : how can SSL with only positive pairs avoid representational collapse ?