lightning/pytorch_lightning/trainer/connectors/model_connector.py

# Copyright The PyTorch Lightning 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 weakref import proxy


class ModelConnector:
    def __init__(self, trainer):
        self.trainer = trainer

    def copy_trainer_model_properties(self, model):
        ref_model = self.trainer.lightning_module or model

        for m in [model, ref_model]:
            m.trainer = proxy(self.trainer)
            m.use_amp = self.trainer.amp_backend is not None
            m.precision = self.trainer.precision