Worked on enhancing the macro substitution system in the pytorch/torchx repository by implementing a to_dict method within the macros class, enabling generation of a current-state dictionary for macro values. Updated the substitute function to utilize this new method, improving the accuracy and reliability of runtime substitutions. Introduced the img_root_secondary configuration to broaden macro coverage and support more flexible pipeline setups. Focused on feature refinement and system stability, with no major bugs reported during the period. Leveraged Python and software development best practices to improve build reliability, reduce manual configuration errors, and enhance the scalability of TorchX configuration workflows.