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import torch
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import os
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def get_rank():
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"""Get rank of current process."""
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print(os.environ.keys())
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if "SLURM_PROCID" in os.environ:
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return int(os.environ["SLURM_PROCID"])
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if not torch.distributed.is_available() or not torch.distributed.is_initialized():
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return 0
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return torch.distributed.get_rank()
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class InverseLR(torch.optim.lr_scheduler._LRScheduler):
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"""Implements an inverse decay learning rate schedule with an optional exponential
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warmup. When last_epoch=-1, sets initial lr as lr.
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inv_gamma is the number of steps/epochs required for the learning rate to decay to
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(1 / 2)**power of its original value.
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Args:
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optimizer (Optimizer): Wrapped optimizer.
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inv_gamma (float): Inverse multiplicative factor of learning rate decay. Default: 1.
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power (float): Exponential factor of learning rate decay. Default: 1.
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warmup (float): Exponential warmup factor (0 <= warmup < 1, 0 to disable)
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Default: 0.
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final_lr (float): The final learning rate. Default: 0.
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last_epoch (int): The index of last epoch. Default: -1.
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verbose (bool): If ``True``, prints a message to stdout for
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each update. Default: ``False``.
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"""
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def __init__(self, optimizer, inv_gamma=1., power=1., warmup=0., final_lr=0.,
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last_epoch=-1, verbose=False):
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self.inv_gamma = inv_gamma
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self.power = power
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if not 0. <= warmup < 1:
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raise ValueError('Invalid value for warmup')
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self.warmup = warmup
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self.final_lr = final_lr
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super().__init__(optimizer, last_epoch, verbose)
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def get_lr(self):
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if not self._get_lr_called_within_step:
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import warnings
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warnings.warn("To get the last learning rate computed by the scheduler, "
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"please use `get_last_lr()`.")
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return self._get_closed_form_lr()
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def _get_closed_form_lr(self):
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warmup = 1 - self.warmup ** (self.last_epoch + 1)
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lr_mult = (1 + self.last_epoch / self.inv_gamma) ** -self.power
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return [warmup * max(self.final_lr, base_lr * lr_mult)
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for base_lr in self.base_lrs]
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def copy_state_dict(model, state_dict):
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"""Load state_dict to model, but only for keys that match exactly.
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Args:
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model (nn.Module): model to load state_dict.
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state_dict (OrderedDict): state_dict to load.
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"""
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model_state_dict = model.state_dict()
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for key in state_dict:
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if key in model_state_dict and state_dict[key].shape == model_state_dict[key].shape:
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if isinstance(state_dict[key], torch.nn.Parameter):
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state_dict[key] = state_dict[key].data
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model_state_dict[key] = state_dict[key]
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model.load_state_dict(model_state_dict, strict=False)
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def create_optimizer_from_config(optimizer_config, parameters):
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"""Create optimizer from config.
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Args:
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parameters (iterable): parameters to optimize.
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optimizer_config (dict): optimizer config.
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Returns:
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torch.optim.Optimizer: optimizer.
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"""
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optimizer_type = optimizer_config["type"]
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if optimizer_type == "FusedAdam":
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from deepspeed.ops.adam import FusedAdam
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optimizer = FusedAdam(parameters, **optimizer_config["config"])
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else:
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optimizer_fn = getattr(torch.optim, optimizer_type)
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optimizer = optimizer_fn(parameters, **optimizer_config["config"])
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return optimizer
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def create_scheduler_from_config(scheduler_config, optimizer):
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"""Create scheduler from config.
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Args:
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scheduler_config (dict): scheduler config.
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optimizer (torch.optim.Optimizer): optimizer.
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Returns:
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torch.optim.lr_scheduler._LRScheduler: scheduler.
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"""
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if scheduler_config["type"] == "InverseLR":
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scheduler_fn = InverseLR
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else:
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scheduler_fn = getattr(torch.optim.lr_scheduler, scheduler_config["type"])
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scheduler = scheduler_fn(optimizer, **scheduler_config["config"])
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return scheduler |
