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# Copyright The Lightning AI team.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
from abc import ABC, abstractmethod
from typing import Any, Callable
class _Launcher(ABC):
r"""Abstract base class for all Launchers.
Launchers are responsible for the creation and instrumentation of new processes so that the
:class:`~lightning.fabric.strategies.strategy.Strategy` can set up communication between all them.
Subclass this class and override any of the relevant methods to provide a custom implementation depending on
cluster environment, hardware, strategy, etc.
"""
@property
@abstractmethod
def is_interactive_compatible(self) -> bool:
"""Returns whether this launcher can work in interactive environments such as Jupyter notebooks."""
@abstractmethod
def launch(self, function: Callable, *args: Any, **kwargs: Any) -> Any:
"""Launches the processes."""
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