/
computation_base.py
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/
computation_base.py
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# Copyright 2018, The TensorFlow Federated Authors.
#
# 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.
"""Defines the abstract interface for classes that represent computations."""
import abc
from tensorflow_federated.python.core.impl.types import typed_object
class Computation(typed_object.TypedObject, metaclass=abc.ABCMeta):
"""An abstract interface for all classes that represent computations."""
@abc.abstractmethod
def __call__(self, *args, **kwargs):
"""Invokes the computation with the given arguments in the given context.
Args:
*args: The positional arguments.
**kwargs: The keyword-based arguments.
Returns:
The result of invoking the computation, the exact form of which depends
on the context.
"""
raise NotImplementedError
@abc.abstractmethod
def __hash__(self) -> int:
"""Hashes the computation.
TFF backends reserve the right to compile instances of `tff.Computation`,
as they may need different representations or data structures altogether.
As these backends need to be able to cache the result of compilation, we
require that `tff.Computation` subclasses be hashable.
Returns:
Integer representing the hash value of the `tff.Computation`.
"""
raise NotImplementedError