138 lines
4.8 KiB
Python
138 lines
4.8 KiB
Python
# Copyright The PyTorch Lightning team.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import importlib
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import inspect
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from inspect import getmembers, isclass
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from pathlib import Path
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from typing import Any, Callable, Dict, List, Optional
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from pytorch_lightning.strategies.strategy import Strategy
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from pytorch_lightning.utilities.exceptions import MisconfigurationException
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class _StrategyRegistry(dict):
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"""This class is a Registry that stores information about the Training Strategies.
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The Strategies are mapped to strings. These strings are names that identify
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a strategy, e.g., "deepspeed". It also returns Optional description and
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parameters to initialize the Strategy, which were defined durng the
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registration.
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The motivation for having a StrategyRegistry is to make it convenient
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for the Users to try different Strategies by passing just strings
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to the strategy flag to the Trainer.
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Example::
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@StrategyRegistry.register("lightning", description="Super fast", a=1, b=True)
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class LightningStrategy:
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def __init__(self, a, b):
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...
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or
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StrategyRegistry.register("lightning", LightningStrategy, description="Super fast", a=1, b=True)
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"""
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def register(
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self,
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name: str,
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strategy: Optional[Callable] = None,
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description: Optional[str] = None,
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override: bool = False,
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**init_params: Any,
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) -> Callable:
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"""Registers a strategy mapped to a name and with required metadata.
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Args:
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name : the name that identifies a strategy, e.g. "deepspeed_stage_3"
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strategy : strategy class
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description : strategy description
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override : overrides the registered strategy, if True
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init_params: parameters to initialize the strategy
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"""
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if not (name is None or isinstance(name, str)):
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raise TypeError(f"`name` must be a str, found {name}")
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if name in self and not override:
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raise MisconfigurationException(f"'{name}' is already present in the registry. HINT: Use `override=True`.")
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data: Dict[str, Any] = {}
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data["description"] = description if description is not None else ""
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data["init_params"] = init_params
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def do_register(strategy: Callable) -> Callable:
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data["strategy"] = strategy
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data["distributed_backend"] = strategy.distributed_backend
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self[name] = data
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return strategy
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if strategy is not None:
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return do_register(strategy)
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return do_register
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def get(self, name: str, default: Optional[Any] = None) -> Any:
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"""Calls the registered strategy with the required parameters and returns the strategy object.
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Args:
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name (str): the name that identifies a strategy, e.g. "deepspeed_stage_3"
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"""
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if name in self:
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data = self[name]
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return data["strategy"](**data["init_params"])
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if default is not None:
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return default
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err_msg = "'{}' not found in registry. Available names: {}"
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available_names = ", ".join(sorted(self.keys())) or "none"
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raise KeyError(err_msg.format(name, available_names))
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def remove(self, name: str) -> None:
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"""Removes the registered strategy by name."""
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self.pop(name)
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def available_strategies(self) -> List:
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"""Returns a list of registered strategies."""
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return list(self.keys())
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def __str__(self) -> str:
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return "Registered Strategies: {}".format(", ".join(self.keys()))
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StrategyRegistry = _StrategyRegistry()
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def is_register_strategies_overridden(strategy: type) -> bool:
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method_name = "register_strategies"
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strategy_attr = getattr(strategy, method_name)
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previous_super_cls = inspect.getmro(strategy)[1]
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if issubclass(previous_super_cls, Strategy):
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super_attr = getattr(previous_super_cls, method_name)
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else:
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return False
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return strategy_attr.__code__ is not super_attr.__code__
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def call_register_strategies(root: Path, base_module: str) -> None:
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module = importlib.import_module(base_module)
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for _, mod in getmembers(module, isclass):
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if issubclass(mod, Strategy) and is_register_strategies_overridden(mod):
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mod.register_strategies(StrategyRegistry)
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