During January 2025, Chen Bai focused on enhancing hardware compatibility for the luanfujun/diffusers repository by addressing a runtime issue related to float64 support on NPU and MPS devices. He implemented a fallback mechanism in Python using PyTorch, ensuring that default timesteps use float32 when float64 is unavailable, while retaining float64 precision where supported. This targeted bug fix improved the reliability of diffusers across diverse hardware, particularly for environments lacking native float64 support. Chen’s work demonstrated a thoughtful approach to cross-device stability, reducing runtime failures and support overhead while deepening the repository’s support for NPU and Metal acceleration.