Source code for lightning.fabric.plugins.io.xla

# Copyright The Lightning AI team.
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# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
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#     http://www.apache.org/licenses/LICENSE-2.0
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# Unless required by applicable law or agreed to in writing, software
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import logging
import os
from typing import Any, Dict, Optional

import torch
from lightning_utilities.core.apply_func import apply_to_collection
from lightning_utilities.core.imports import RequirementCache
from typing_extensions import override

from lightning.fabric.accelerators.xla import _XLA_AVAILABLE
from lightning.fabric.plugins.io.torch_io import TorchCheckpointIO
from lightning.fabric.utilities.cloud_io import get_filesystem
from lightning.fabric.utilities.types import _PATH

log = logging.getLogger(__name__)


[docs]class XLACheckpointIO(TorchCheckpointIO): """CheckpointIO that utilizes ``xm.save`` to save checkpoints for TPU training strategies. .. warning:: This is an :ref:`experimental <versioning:Experimental API>` feature. """ def __init__(self, *args: Any, **kwargs: Any) -> None: if not _XLA_AVAILABLE: raise ModuleNotFoundError(str(_XLA_AVAILABLE)) super().__init__(*args, **kwargs)
[docs] @override def save_checkpoint(self, checkpoint: Dict[str, Any], path: _PATH, storage_options: Optional[Any] = None) -> None: """Save model/training states as a checkpoint file through state-dump and file-write. Args: checkpoint: dict containing model and trainer state path: write-target path storage_options: not used in ``XLACheckpointIO.save_checkpoint`` Raises: TypeError: If ``storage_options`` arg is passed in """ if storage_options is not None: raise TypeError( "`Trainer.save_checkpoint(..., storage_options=...)` with `storage_options` arg" f" is not supported for `{self.__class__.__name__}`. Please implement your custom `CheckpointIO`" " to define how you'd like to use `storage_options`." ) fs = get_filesystem(path) fs.makedirs(os.path.dirname(path), exist_ok=True) if RequirementCache("omegaconf"): # workaround for https://github.com/pytorch/xla/issues/2773 from omegaconf import DictConfig, ListConfig, OmegaConf checkpoint = apply_to_collection(checkpoint, (DictConfig, ListConfig), OmegaConf.to_container) import torch_xla.core.xla_model as xm cpu_data = xm._maybe_convert_to_cpu(checkpoint, convert=True) log.debug(f"Saving checkpoint: {path}") torch.save(cpu_data, path)