Source code for orbax.checkpoint.proto_checkpoint_handler
# Copyright 2024 The Orbax Authors.
#
# 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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"""ProtoCheckpointHandler class.
Implementation of CheckpointHandler interface.
"""
import asyncio
from concurrent import futures
import dataclasses
import functools
from typing import List, Optional, Type
from etils import epath
from google.protobuf import message
from google.protobuf import text_format
from orbax.checkpoint import async_checkpoint_handler
from orbax.checkpoint import checkpoint_args
from orbax.checkpoint import future
from orbax.checkpoint import utils
CheckpointArgs = checkpoint_args.CheckpointArgs
register_with_handler = checkpoint_args.register_with_handler
[docs]class ProtoCheckpointHandler(async_checkpoint_handler.AsyncCheckpointHandler):
"""Serializes/deserializes protocol buffers."""
[docs] def __init__(self, filename: str, primary_host: Optional[int] = 0):
"""Initializes ProtoCheckpointHandler.
Args:
filename: file name given to the written file.
primary_host: primary host to write on. If None, writes on all hosts.
"""
self._filename = filename
self._primary_host = primary_host
self._executor = futures.ThreadPoolExecutor(max_workers=1)
[docs] async def async_save(
self,
directory: epath.Path,
item: Optional[message.Message] = None,
args: Optional["ProtoSaveArgs"] = None,
) -> Optional[List[future.Future]]:
"""Saves the given proto.
Args:
directory: save location directory.
item: Deprecated, use `args`.
args: ProtoSaveArgs (see below).
Returns:
A commit future.
"""
if args is not None:
item = args.item
def _save_fn(x):
if utils.is_primary_host(self._primary_host):
path = directory / self._filename
return path.write_text(text_format.MessageToString(x))
return 0
return [self._executor.submit(functools.partial(_save_fn, item))]
[docs] def save(self, *args, **kwargs):
"""Saves the provided item."""
async def async_save():
commit_futures = await self.async_save(*args, **kwargs)
if commit_futures:
for f in commit_futures:
f.result()
asyncio.run(async_save())
[docs] def restore(
self,
directory: epath.Path,
item: Optional[Type[message.Message]] = None,
args: Optional["ProtoRestoreArgs"] = None,
):
"""Restores the proto from directory.
Args:
directory: restore location directory.
item: Deprecated, use `args`.
args: ProtoRestoreArgs (see below).
Returns:
The deserialized proto read from `directory` if item is not None
"""
if not args and not item:
raise ValueError(
"Must provide `item` in order to deserialize proto to the correct"
" type."
)
if args:
item = args.item
path = directory / self._filename
return text_format.Parse(path.read_text(), item())
[docs] def close(self):
self._executor.shutdown()
@register_with_handler(ProtoCheckpointHandler, for_save=True)
@dataclasses.dataclass
class ProtoSaveArgs(CheckpointArgs):
"""Parameters for saving a proto.
Attributes:
item (required): the proto to serialize.
"""
item: message.Message
@register_with_handler(ProtoCheckpointHandler, for_restore=True)
@dataclasses.dataclass
class ProtoRestoreArgs(CheckpointArgs):
"""Proto restore args.
Attributes:
item (required): the proto class
"""
item: Type[message.Message]