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| # Copyright (c) OpenMMLab. All rights reserved. | |
| import warnings | |
| import torch | |
| from mmocr.models.builder import (RECOGNIZERS, build_backbone, build_convertor, | |
| build_decoder, build_encoder, build_loss, | |
| build_preprocessor) | |
| from .base import BaseRecognizer | |
| class EncodeDecodeRecognizer(BaseRecognizer): | |
| """Base class for encode-decode recognizer.""" | |
| def __init__(self, | |
| preprocessor=None, | |
| backbone=None, | |
| encoder=None, | |
| decoder=None, | |
| loss=None, | |
| label_convertor=None, | |
| train_cfg=None, | |
| test_cfg=None, | |
| max_seq_len=40, | |
| pretrained=None, | |
| init_cfg=None): | |
| super().__init__(init_cfg=init_cfg) | |
| # Label convertor (str2tensor, tensor2str) | |
| assert label_convertor is not None | |
| label_convertor.update(max_seq_len=max_seq_len) | |
| self.label_convertor = build_convertor(label_convertor) | |
| # Preprocessor module, e.g., TPS | |
| self.preprocessor = None | |
| if preprocessor is not None: | |
| self.preprocessor = build_preprocessor(preprocessor) | |
| # Backbone | |
| assert backbone is not None | |
| self.backbone = build_backbone(backbone) | |
| # Encoder module | |
| self.encoder = None | |
| if encoder is not None: | |
| self.encoder = build_encoder(encoder) | |
| # Decoder module | |
| assert decoder is not None | |
| decoder.update(num_classes=self.label_convertor.num_classes()) | |
| decoder.update(start_idx=self.label_convertor.start_idx) | |
| decoder.update(padding_idx=self.label_convertor.padding_idx) | |
| decoder.update(max_seq_len=max_seq_len) | |
| self.decoder = build_decoder(decoder) | |
| # Loss | |
| assert loss is not None | |
| loss.update(ignore_index=self.label_convertor.padding_idx) | |
| self.loss = build_loss(loss) | |
| self.train_cfg = train_cfg | |
| self.test_cfg = test_cfg | |
| self.max_seq_len = max_seq_len | |
| if pretrained is not None: | |
| warnings.warn('DeprecationWarning: pretrained is a deprecated \ | |
| key, please consider using init_cfg') | |
| self.init_cfg = dict(type='Pretrained', checkpoint=pretrained) | |
| def extract_feat(self, img): | |
| """Directly extract features from the backbone.""" | |
| if self.preprocessor is not None: | |
| img = self.preprocessor(img) | |
| x = self.backbone(img) | |
| return x | |
| def forward_train(self, img, img_metas): | |
| """ | |
| Args: | |
| img (tensor): Input images of shape (N, C, H, W). | |
| Typically these should be mean centered and std scaled. | |
| img_metas (list[dict]): A list of image info dict where each dict | |
| contains: 'img_shape', 'filename', and may also contain | |
| 'ori_shape', and 'img_norm_cfg'. | |
| For details on the values of these keys see | |
| :class:`mmdet.datasets.pipelines.Collect`. | |
| Returns: | |
| dict[str, tensor]: A dictionary of loss components. | |
| """ | |
| for img_meta in img_metas: | |
| valid_ratio = 1.0 * img_meta['resize_shape'][1] / img.size(-1) | |
| img_meta['valid_ratio'] = valid_ratio | |
| feat = self.extract_feat(img) | |
| gt_labels = [img_meta['text'] for img_meta in img_metas] | |
| targets_dict = self.label_convertor.str2tensor(gt_labels) | |
| out_enc = None | |
| if self.encoder is not None: | |
| out_enc = self.encoder(feat, img_metas) | |
| out_dec = self.decoder( | |
| feat, out_enc, targets_dict, img_metas, train_mode=True) | |
| loss_inputs = ( | |
| out_dec, | |
| targets_dict, | |
| img_metas, | |
| ) | |
| losses = self.loss(*loss_inputs) | |
| return losses | |
| def simple_test(self, img, img_metas, **kwargs): | |
| """Test function with test time augmentation. | |
| Args: | |
| imgs (torch.Tensor): Image input tensor. | |
| img_metas (list[dict]): List of image information. | |
| Returns: | |
| list[str]: Text label result of each image. | |
| """ | |
| for img_meta in img_metas: | |
| valid_ratio = 1.0 * img_meta['resize_shape'][1] / img.size(-1) | |
| img_meta['valid_ratio'] = valid_ratio | |
| feat = self.extract_feat(img) | |
| out_enc = None | |
| if self.encoder is not None: | |
| out_enc = self.encoder(feat, img_metas) | |
| out_dec = self.decoder( | |
| feat, out_enc, None, img_metas, train_mode=False) | |
| # early return to avoid post processing | |
| if torch.onnx.is_in_onnx_export(): | |
| return out_dec | |
| label_indexes, label_scores = self.label_convertor.tensor2idx( | |
| out_dec, img_metas) | |
| label_strings = self.label_convertor.idx2str(label_indexes) | |
| # flatten batch results | |
| results = [] | |
| for string, score in zip(label_strings, label_scores): | |
| results.append(dict(text=string, score=score)) | |
| return results | |
| def merge_aug_results(self, aug_results): | |
| out_text, out_score = '', -1 | |
| for result in aug_results: | |
| text = result[0]['text'] | |
| score = sum(result[0]['score']) / max(1, len(text)) | |
| if score > out_score: | |
| out_text = text | |
| out_score = score | |
| out_results = [dict(text=out_text, score=out_score)] | |
| return out_results | |
| def aug_test(self, imgs, img_metas, **kwargs): | |
| """Test function as well as time augmentation. | |
| Args: | |
| imgs (list[tensor]): Tensor should have shape NxCxHxW, | |
| which contains all images in the batch. | |
| img_metas (list[list[dict]]): The metadata of images. | |
| """ | |
| aug_results = [] | |
| for img, img_meta in zip(imgs, img_metas): | |
| result = self.simple_test(img, img_meta, **kwargs) | |
| aug_results.append(result) | |
| return self.merge_aug_results(aug_results) | |