Decays the momentum value of each parameter group by a small constant factor until the number of epoch reaches a pre-defined milestone: end. Notice that such decay can happen simultaneously with other changes to the momentum value from outside this scheduler.
optimizer (Optimizer or OptimWrapper) – optimizer or Wrapped optimizer.
factor (float) – The number we multiply momentum until the milestone. Defaults to 1./3.
begin (int) – Step at which to start updating the momentum. Defaults to 0.
end (int) – Step at which to stop updating the momentum. Defaults to INF.
last_step (int) – The index of last step. Used for resume without state dict. Defaults to -1.
by_epoch (bool) – Whether the scheduled momentum is updated by epochs. Defaults to True.
verbose (bool) – Whether to print the momentum for each update. Defaults to False.
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