CASPER: A Large Scale Spontaneous Speech Dataset. - Cihan Xiao; Ruixing Liang; Xiangyu Zhang; Mehmet Emre Tiryaki; Veronica Bae; Lavanya Shankar; Rong Yang; Ethan Poon; Emmanuel Dupoux; Sanjeev Khudanpur; Leibny Paola García-Perera (CoRR, 2025)