| # Copyright 2020 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 | |
| # limitations under the License. | |
| from typing import TYPE_CHECKING, Any, Callable | |
| from monai.utils import exact_version, optional_import | |
| if TYPE_CHECKING: | |
| from ignite.engine import Engine | |
| else: | |
| Engine, _ = optional_import("ignite.engine", "0.3.0", exact_version, "Engine") | |
| def stopping_fn_from_metric(metric_name: str) -> Callable[[Engine], Any]: | |
| """ | |
| Returns a stopping function for ignite.handlers.EarlyStopping using the given metric name. | |
| """ | |
| def stopping_fn(engine: Engine): | |
| return engine.state.metrics[metric_name] | |
| return stopping_fn | |
| def stopping_fn_from_loss() -> Callable[[Engine], Any]: | |
| """ | |
| Returns a stopping function for ignite.handlers.EarlyStopping using the loss value. | |
| """ | |
| def stopping_fn(engine: Engine): | |
| return -engine.state.output | |
| return stopping_fn | |