The learning-rate scheduler utility needs to remain usable with the PyTorch versions supported by this…

The learning-rate scheduler utility needs to remain usable with the PyTorch versions supported by this…: a task in MiMo-V2.6-RL-harbor-code: MiMo-V2.6-RL Code (Harbor) (Harbor dataset). Keep the existing public constructor and cosine schedule entry points. CosineWarmupScheduler must accept the…