Data Challenge Overview The Roman Space Telescope is expected to observe O(10^5) galaxy-galaxy strong gravitational lenses, providing high angular resolution images of galaxy-galaxy strong gravitational lenses that can be used to probe the nature of dark matter at sub-galactic scales (Daylan and Birrer 2023, Wedig et al. 2025). The Roman Data Challenge for Dark Matter Substructure with Galaxy-Galaxy Strong Gravitational Lenses provides realistic simulated Roman images of strong lenses with various dark matter substructure populations and challenges the community to test out substructure detection and characterization pipelines. Dataset Description The goal of this rung is to distinguish between mass distributions with Cold Dark Matter subhalos and no subhalos. In this rung, you will train a binary classifier to determine whether subhalos are present. Changelog v1.0: Initial version