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| # copyright (c) 2022 PaddlePaddle Authors. All Rights Reserve. | |
| # | |
| # 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 __future__ import absolute_import | |
| from __future__ import division | |
| from __future__ import print_function | |
| import paddle | |
| from paddle import nn | |
| from .rec_ctc_loss import CTCLoss | |
| from .rec_sar_loss import SARLoss | |
| from .rec_nrtr_loss import NRTRLoss | |
| class MultiLoss(nn.Layer): | |
| def __init__(self, **kwargs): | |
| super().__init__() | |
| self.loss_funcs = {} | |
| self.loss_list = kwargs.pop('loss_config_list') | |
| self.weight_1 = kwargs.get('weight_1', 1.0) | |
| self.weight_2 = kwargs.get('weight_2', 1.0) | |
| for loss_info in self.loss_list: | |
| for name, param in loss_info.items(): | |
| if param is not None: | |
| kwargs.update(param) | |
| loss = eval(name)(**kwargs) | |
| self.loss_funcs[name] = loss | |
| def forward(self, predicts, batch): | |
| self.total_loss = {} | |
| total_loss = 0.0 | |
| # batch [image, label_ctc, label_sar, length, valid_ratio] | |
| for name, loss_func in self.loss_funcs.items(): | |
| if name == 'CTCLoss': | |
| loss = loss_func(predicts['ctc'], | |
| batch[:2] + batch[3:])['loss'] * self.weight_1 | |
| elif name == 'SARLoss': | |
| loss = loss_func(predicts['sar'], | |
| batch[:1] + batch[2:])['loss'] * self.weight_2 | |
| elif name == 'NRTRLoss': | |
| loss = loss_func(predicts['nrtr'], | |
| batch[:1] + batch[2:])['loss'] * self.weight_2 | |
| else: | |
| raise NotImplementedError( | |
| '{} is not supported in MultiLoss yet'.format(name)) | |
| self.total_loss[name] = loss | |
| total_loss += loss | |
| self.total_loss['loss'] = total_loss | |
| return self.total_loss | |