Source code for monai.handlers.post_processing

# Copyright 2020 - 2021 MONAI Consortium
# 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
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from typing import TYPE_CHECKING, Callable

from monai.engines.utils import IterationEvents, engine_apply_transform
from monai.utils import exact_version, optional_import

Events, _ = optional_import("ignite.engine", "0.4.4", exact_version, "Events")
if TYPE_CHECKING:
    from ignite.engine import Engine
else:
    Engine, _ = optional_import("ignite.engine", "0.4.4", exact_version, "Engine")


[docs]class PostProcessing: """ Ignite handler to execute additional post processing after the post transforms in engines. So users can insert other handlers between post transforms and this post processing handler. """ def __init__(self, transform: Callable) -> None: """ Args: transform: callable function to execute on the `engine.state.batch` and `engine.state.output`. can also be composed post transforms. """ self.transform = transform
[docs] def attach(self, engine: Engine) -> None: """ Args: engine: Ignite Engine, it can be a trainer, validator or evaluator. """ engine.add_event_handler(IterationEvents.MODEL_COMPLETED, self)
def __call__(self, engine: Engine) -> None: """ Args: engine: Ignite Engine, it can be a trainer, validator or evaluator. """ engine.state.batch, engine.state.output = engine_apply_transform( batch=engine.state.batch, output=engine.state.output, transform=self.transform, )