Arno Bock developed the Independent Subnet Training (IST) built-in function for the apache/systemds repository, enabling distributed neural network training across independent subnets. By leveraging DML and Java, Arno designed and implemented a feature that improves parallelism and resource efficiency in large-scale model training. The IST function allows for faster experimentation and lays the groundwork for future distributed training capabilities within SystemDS. Throughout the month, Arno focused on end-to-end feature delivery, integration, and code quality, demonstrating skills in distributed computing, machine learning, and built-in function development. No major bugs were addressed, as efforts centered on this foundational engineering contribution.