The contrastive learning method in tongue image representation learning and its significance in intelligent diagnosis. - Qi Liu; Dan-dan Xu; Peng Yang; Quanquan Liu 001; Shuai-shuai Xia; Miao Zhang; Ya-yun Li; Chunbao Wang 001; Qing-hua Peng (Health Inf. Sci. Syst., 2025)