I4U System Description for NIST SRE'20 CTS Challenge. - Kong Aik Lee; Tomi Kinnunen; Daniele Colibro; Claudio Vair; Andreas Nautsch; Hanwu Sun; Liang He 003; Tianyu Liang; Qiongqiong Wang; Mickael Rouvier; Pierre-Michel Bousquet; Rohan Kumar Das; et al. (CoRR, 2022)