Worked on the liguodongiot/transformers repository to enhance type safety in the image transformation utilities. Refactored the Normalize function to accept Collection types for mean and standard deviation parameters, aligning with Python typing best practices and reducing future deprecation risks for downstream users. This targeted update improves API maintainability and sets a foundation for further type-safe refactoring across the codebase. The work involved Python programming with a focus on data processing, image processing, and unit testing to ensure robust functionality. The change supports more stable pipelines for users relying on image_transforms.normalize and contributes to the long-term stability of the repository.