PORTAL: Controllable Landscape Generator for Continuous Optimization-Part I: Framework. - Danial Yazdani; Mai Peng; Delaram Yazdani; Shima F. Yazdi; Mohammad Nabi Omidvar; Yuan Sun 003; Trung Thanh Nguyen 002; Changhe Li; Xiaodong Li 001 (CoRR, 2025)