During February 2026, Janson Sport focused on modernizing error handling within the Dynamo module of the pytorch/pytorch repository. He refactored the codebase to replace the deprecated IncorrectUsage exception with standardized RuntimeError usage, aligning error semantics with PyTorch conventions. This update included revising and expanding unit tests to ensure improved coverage and clearer error reporting. By consolidating error paths and simplifying exception handling, Janson enhanced the module’s robustness and maintainability. Working primarily in Python, he applied skills in error handling, refactoring, and testing to reduce debugging time for downstream users and support more consistent workflows across PyTorch Dynamo.