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# Copyright 2019 Kakao Brain
#
# Copyright (c) Facebook, Inc. and its affiliates. All rights reserved.
#
# This source code is licensed under the BSD license found in the
# LICENSE file in the root directory of this source tree.
"""Provides isolated namespace of skip tensors."""
import abc
from functools import total_ordering
from typing import Any
import uuid
__all__ = ["Namespace"]
@total_ordering
class Namespace(metaclass=abc.ABCMeta):
"""Namespace for isolating skip tensors used by :meth:`isolate()
<torchpipe.skip.skippable.Skippable.isolate>`.
"""
__slots__ = ("id",)
def __init__(self) -> None:
self.id = uuid.uuid4()
def __repr__(self) -> str:
return f"<Namespace '{self.id}'>"
def __hash__(self) -> int:
return hash(self.id)
# Namespaces should support ordering, since SkipLayout will sort tuples
# including a namespace. But actual order between namespaces is not
# important. That's why they are ordered by version 4 UUID which generates
# random numbers.
def __lt__(self, other: Any) -> bool:
if isinstance(other, Namespace):
return self.id < other.id
return False
def __eq__(self, other: Any) -> bool:
if isinstance(other, Namespace):
return self.id == other.id
return False
# 'None' is the default namespace,
# which means that 'isinstance(None, Namespace)' is 'True'.
Namespace.register(type(None))
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