towhee.trainer.optimization.optimization.get_cosine_schedule_with_warmup(optimizer: Optimizer, num_warmup_steps: int, num_training_steps: int, num_cycles: float = 0.5, last_epoch: int = -1)[source]

Create a schedule with a learning rate that decreases following the values of the cosine function between the initial lr set in the optimizer to 0, after a warmup period during which it increases linearly between 0 and the initial lr set in the optimizer.

  • optimizer (Optimizer) – The optimizer for which to schedule the learning rate.

  • num_warmup_steps (int) – The number of steps for the warmup phase.

  • num_training_steps (int) – The total number of training steps.

  • num_cycles (float, optional, defaults to 0.5) – The number of waves in the cosine schedule (the defaults is to just decrease from the max value to 0 following a half-cosine).

  • last_epoch (int, optional, defaults to -1) – The index of the last epoch when resuming training.


torch.optim.lr_scheduler.LambdaLR with the appropriate schedule.