74 lines
2.9 KiB
Python
74 lines
2.9 KiB
Python
from typing import Any, Callable, Optional, TYPE_CHECKING, Union
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import torch
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from torch.optim import Optimizer
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from pytorch_lightning.accelerators.accelerator import Accelerator
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from pytorch_lightning.plugins.precision import MixedPrecisionPlugin
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from pytorch_lightning.plugins.training_type.single_tpu import SingleTPUPlugin
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from pytorch_lightning.plugins.training_type.tpu_spawn import TPUSpawnPlugin
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from pytorch_lightning.utilities import _XLA_AVAILABLE
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from pytorch_lightning.utilities.exceptions import MisconfigurationException
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if _XLA_AVAILABLE:
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import torch_xla.core.xla_model as xm
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from torch_xla._patched_functions import clip_grad_norm_
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xla_clip_grad_norm_ = clip_grad_norm_
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if TYPE_CHECKING:
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from pytorch_lightning.core.lightning import LightningModule
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from pytorch_lightning.trainer.trainer import Trainer
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class TPUAccelerator(Accelerator):
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def setup(self, trainer: 'Trainer', model: 'LightningModule') -> None:
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"""
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Raises:
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MisconfigurationException:
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If AMP is used with TPU, or if TPUs are not using a single TPU core or TPU spawn training.
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"""
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if isinstance(self.precision_plugin, MixedPrecisionPlugin):
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raise MisconfigurationException(
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"amp + tpu is not supported. "
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"Only bfloats are supported on TPU. Consider using TPUHalfPrecisionPlugin"
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)
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if not isinstance(self.training_type_plugin, (SingleTPUPlugin, TPUSpawnPlugin)):
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raise MisconfigurationException("TPUs only support a single tpu core or tpu spawn training.")
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return super().setup(trainer, model)
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def run_optimizer_step(
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self, optimizer: Optimizer, optimizer_idx: int, lambda_closure: Callable, **kwargs: Any
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) -> None:
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xm.optimizer_step(optimizer, barrier=False, optimizer_args={'closure': lambda_closure, **kwargs})
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def all_gather(self, tensor: torch.Tensor, group: Optional[Any] = None, sync_grads: bool = False) -> torch.Tensor:
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"""
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Function to gather a tensor from several distributed processes
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Args:
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tensor: tensor of shape (batch, ...)
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group: not available with TPUs
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sync_grads: not available with TPUs
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Return:
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A tensor of shape (world_size, batch, ...)
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"""
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# todo: Add support for backward with all_gather
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if isinstance(self.training_type_plugin, TPUSpawnPlugin) and self.training_type_plugin.is_distributed:
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return xm.all_gather(tensor).view(-1, *tensor.shape)
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return tensor
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def clip_gradients(self, optimizer: Optimizer, clip_val: Union[float, int], norm_type: float = 2.0):
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model = self.lightning_module
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parameters = model.parameters()
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grad_clip_val = float(clip_val)
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if grad_clip_val <= 0:
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return
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max_norm = grad_clip_val
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xla_clip_grad_norm_(parameters, max_norm, norm_type)
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