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| import torch | |
| import torch.nn as nn | |
| from mmdet.core import (bbox2result, bbox2roi, bbox_mapping, build_assigner, | |
| build_sampler, merge_aug_bboxes, merge_aug_masks, | |
| multiclass_nms) | |
| from ..builder import HEADS, build_head, build_roi_extractor | |
| from .base_roi_head import BaseRoIHead | |
| from .test_mixins import BBoxTestMixin, MaskTestMixin | |
| class CascadeRoIHead(BaseRoIHead, BBoxTestMixin, MaskTestMixin): | |
| """Cascade roi head including one bbox head and one mask head. | |
| https://arxiv.org/abs/1712.00726 | |
| """ | |
| def __init__(self, | |
| num_stages, | |
| stage_loss_weights, | |
| bbox_roi_extractor=None, | |
| bbox_head=None, | |
| mask_roi_extractor=None, | |
| mask_head=None, | |
| shared_head=None, | |
| train_cfg=None, | |
| test_cfg=None): | |
| assert bbox_roi_extractor is not None | |
| assert bbox_head is not None | |
| assert shared_head is None, \ | |
| 'Shared head is not supported in Cascade RCNN anymore' | |
| self.num_stages = num_stages | |
| self.stage_loss_weights = stage_loss_weights | |
| super(CascadeRoIHead, self).__init__( | |
| bbox_roi_extractor=bbox_roi_extractor, | |
| bbox_head=bbox_head, | |
| mask_roi_extractor=mask_roi_extractor, | |
| mask_head=mask_head, | |
| shared_head=shared_head, | |
| train_cfg=train_cfg, | |
| test_cfg=test_cfg) | |
| def init_bbox_head(self, bbox_roi_extractor, bbox_head): | |
| """Initialize box head and box roi extractor. | |
| Args: | |
| bbox_roi_extractor (dict): Config of box roi extractor. | |
| bbox_head (dict): Config of box in box head. | |
| """ | |
| self.bbox_roi_extractor = nn.ModuleList() | |
| self.bbox_head = nn.ModuleList() | |
| if not isinstance(bbox_roi_extractor, list): | |
| bbox_roi_extractor = [ | |
| bbox_roi_extractor for _ in range(self.num_stages) | |
| ] | |
| if not isinstance(bbox_head, list): | |
| bbox_head = [bbox_head for _ in range(self.num_stages)] | |
| assert len(bbox_roi_extractor) == len(bbox_head) == self.num_stages | |
| for roi_extractor, head in zip(bbox_roi_extractor, bbox_head): | |
| self.bbox_roi_extractor.append(build_roi_extractor(roi_extractor)) | |
| self.bbox_head.append(build_head(head)) | |
| def init_mask_head(self, mask_roi_extractor, mask_head): | |
| """Initialize mask head and mask roi extractor. | |
| Args: | |
| mask_roi_extractor (dict): Config of mask roi extractor. | |
| mask_head (dict): Config of mask in mask head. | |
| """ | |
| self.mask_head = nn.ModuleList() | |
| if not isinstance(mask_head, list): | |
| mask_head = [mask_head for _ in range(self.num_stages)] | |
| assert len(mask_head) == self.num_stages | |
| for head in mask_head: | |
| self.mask_head.append(build_head(head)) | |
| if mask_roi_extractor is not None: | |
| self.share_roi_extractor = False | |
| self.mask_roi_extractor = nn.ModuleList() | |
| if not isinstance(mask_roi_extractor, list): | |
| mask_roi_extractor = [ | |
| mask_roi_extractor for _ in range(self.num_stages) | |
| ] | |
| assert len(mask_roi_extractor) == self.num_stages | |
| for roi_extractor in mask_roi_extractor: | |
| self.mask_roi_extractor.append( | |
| build_roi_extractor(roi_extractor)) | |
| else: | |
| self.share_roi_extractor = True | |
| self.mask_roi_extractor = self.bbox_roi_extractor | |
| def init_assigner_sampler(self): | |
| """Initialize assigner and sampler for each stage.""" | |
| self.bbox_assigner = [] | |
| self.bbox_sampler = [] | |
| if self.train_cfg is not None: | |
| for idx, rcnn_train_cfg in enumerate(self.train_cfg): | |
| self.bbox_assigner.append( | |
| build_assigner(rcnn_train_cfg.assigner)) | |
| self.current_stage = idx | |
| self.bbox_sampler.append( | |
| build_sampler(rcnn_train_cfg.sampler, context=self)) | |
| def init_weights(self, pretrained): | |
| """Initialize the weights in head. | |
| Args: | |
| pretrained (str, optional): Path to pre-trained weights. | |
| Defaults to None. | |
| """ | |
| if self.with_shared_head: | |
| self.shared_head.init_weights(pretrained=pretrained) | |
| for i in range(self.num_stages): | |
| if self.with_bbox: | |
| self.bbox_roi_extractor[i].init_weights() | |
| self.bbox_head[i].init_weights() | |
| if self.with_mask: | |
| if not self.share_roi_extractor: | |
| self.mask_roi_extractor[i].init_weights() | |
| self.mask_head[i].init_weights() | |
| def forward_dummy(self, x, proposals): | |
| """Dummy forward function.""" | |
| # bbox head | |
| outs = () | |
| rois = bbox2roi([proposals]) | |
| if self.with_bbox: | |
| for i in range(self.num_stages): | |
| bbox_results = self._bbox_forward(i, x, rois) | |
| outs = outs + (bbox_results['cls_score'], | |
| bbox_results['bbox_pred']) | |
| # mask heads | |
| if self.with_mask: | |
| mask_rois = rois[:100] | |
| for i in range(self.num_stages): | |
| mask_results = self._mask_forward(i, x, mask_rois) | |
| outs = outs + (mask_results['mask_pred'], ) | |
| return outs | |
| def _bbox_forward(self, stage, x, rois): | |
| """Box head forward function used in both training and testing.""" | |
| bbox_roi_extractor = self.bbox_roi_extractor[stage] | |
| bbox_head = self.bbox_head[stage] | |
| bbox_feats = bbox_roi_extractor(x[:bbox_roi_extractor.num_inputs], | |
| rois) | |
| # do not support caffe_c4 model anymore | |
| cls_score, bbox_pred = bbox_head(bbox_feats) | |
| bbox_results = dict( | |
| cls_score=cls_score, bbox_pred=bbox_pred, bbox_feats=bbox_feats) | |
| return bbox_results | |
| def _bbox_forward_train(self, stage, x, sampling_results, gt_bboxes, | |
| gt_labels, rcnn_train_cfg): | |
| """Run forward function and calculate loss for box head in training.""" | |
| rois = bbox2roi([res.bboxes for res in sampling_results]) | |
| bbox_results = self._bbox_forward(stage, x, rois) | |
| bbox_targets = self.bbox_head[stage].get_targets( | |
| sampling_results, gt_bboxes, gt_labels, rcnn_train_cfg) | |
| loss_bbox = self.bbox_head[stage].loss(bbox_results['cls_score'], | |
| bbox_results['bbox_pred'], rois, | |
| *bbox_targets) | |
| bbox_results.update( | |
| loss_bbox=loss_bbox, rois=rois, bbox_targets=bbox_targets) | |
| return bbox_results | |
| def _mask_forward(self, stage, x, rois): | |
| """Mask head forward function used in both training and testing.""" | |
| mask_roi_extractor = self.mask_roi_extractor[stage] | |
| mask_head = self.mask_head[stage] | |
| mask_feats = mask_roi_extractor(x[:mask_roi_extractor.num_inputs], | |
| rois) | |
| # do not support caffe_c4 model anymore | |
| mask_pred = mask_head(mask_feats) | |
| mask_results = dict(mask_pred=mask_pred) | |
| return mask_results | |
| def _mask_forward_train(self, | |
| stage, | |
| x, | |
| sampling_results, | |
| gt_masks, | |
| rcnn_train_cfg, | |
| bbox_feats=None): | |
| """Run forward function and calculate loss for mask head in | |
| training.""" | |
| pos_rois = bbox2roi([res.pos_bboxes for res in sampling_results]) | |
| mask_results = self._mask_forward(stage, x, pos_rois) | |
| mask_targets = self.mask_head[stage].get_targets( | |
| sampling_results, gt_masks, rcnn_train_cfg) | |
| pos_labels = torch.cat([res.pos_gt_labels for res in sampling_results]) | |
| loss_mask = self.mask_head[stage].loss(mask_results['mask_pred'], | |
| mask_targets, pos_labels) | |
| mask_results.update(loss_mask=loss_mask) | |
| return mask_results | |
| def forward_train(self, | |
| x, | |
| img_metas, | |
| proposal_list, | |
| gt_bboxes, | |
| gt_labels, | |
| gt_bboxes_ignore=None, | |
| gt_masks=None): | |
| """ | |
| Args: | |
| x (list[Tensor]): list of multi-level img features. | |
| img_metas (list[dict]): list of image info dict where each dict | |
| has: 'img_shape', 'scale_factor', 'flip', and may also contain | |
| 'filename', 'ori_shape', 'pad_shape', and 'img_norm_cfg'. | |
| For details on the values of these keys see | |
| `mmdet/datasets/pipelines/formatting.py:Collect`. | |
| proposals (list[Tensors]): list of region proposals. | |
| gt_bboxes (list[Tensor]): Ground truth bboxes for each image with | |
| shape (num_gts, 4) in [tl_x, tl_y, br_x, br_y] format. | |
| gt_labels (list[Tensor]): class indices corresponding to each box | |
| gt_bboxes_ignore (None | list[Tensor]): specify which bounding | |
| boxes can be ignored when computing the loss. | |
| gt_masks (None | Tensor) : true segmentation masks for each box | |
| used if the architecture supports a segmentation task. | |
| Returns: | |
| dict[str, Tensor]: a dictionary of loss components | |
| """ | |
| losses = dict() | |
| for i in range(self.num_stages): | |
| self.current_stage = i | |
| rcnn_train_cfg = self.train_cfg[i] | |
| lw = self.stage_loss_weights[i] | |
| # assign gts and sample proposals | |
| sampling_results = [] | |
| if self.with_bbox or self.with_mask: | |
| bbox_assigner = self.bbox_assigner[i] | |
| bbox_sampler = self.bbox_sampler[i] | |
| num_imgs = len(img_metas) | |
| if gt_bboxes_ignore is None: | |
| gt_bboxes_ignore = [None for _ in range(num_imgs)] | |
| for j in range(num_imgs): | |
| assign_result = bbox_assigner.assign( | |
| proposal_list[j], gt_bboxes[j], gt_bboxes_ignore[j], | |
| gt_labels[j]) | |
| sampling_result = bbox_sampler.sample( | |
| assign_result, | |
| proposal_list[j], | |
| gt_bboxes[j], | |
| gt_labels[j], | |
| feats=[lvl_feat[j][None] for lvl_feat in x]) | |
| sampling_results.append(sampling_result) | |
| # bbox head forward and loss | |
| bbox_results = self._bbox_forward_train(i, x, sampling_results, | |
| gt_bboxes, gt_labels, | |
| rcnn_train_cfg) | |
| for name, value in bbox_results['loss_bbox'].items(): | |
| losses[f's{i}.{name}'] = ( | |
| value * lw if 'loss' in name else value) | |
| # mask head forward and loss | |
| if self.with_mask: | |
| mask_results = self._mask_forward_train( | |
| i, x, sampling_results, gt_masks, rcnn_train_cfg, | |
| bbox_results['bbox_feats']) | |
| for name, value in mask_results['loss_mask'].items(): | |
| losses[f's{i}.{name}'] = ( | |
| value * lw if 'loss' in name else value) | |
| # refine bboxes | |
| if i < self.num_stages - 1: | |
| pos_is_gts = [res.pos_is_gt for res in sampling_results] | |
| # bbox_targets is a tuple | |
| roi_labels = bbox_results['bbox_targets'][0] | |
| with torch.no_grad(): | |
| roi_labels = torch.where( | |
| roi_labels == self.bbox_head[i].num_classes, | |
| bbox_results['cls_score'][:, :-1].argmax(1), | |
| roi_labels) | |
| proposal_list = self.bbox_head[i].refine_bboxes( | |
| bbox_results['rois'], roi_labels, | |
| bbox_results['bbox_pred'], pos_is_gts, img_metas) | |
| return losses | |
| def simple_test(self, x, proposal_list, img_metas, rescale=False): | |
| """Test without augmentation.""" | |
| assert self.with_bbox, 'Bbox head must be implemented.' | |
| num_imgs = len(proposal_list) | |
| img_shapes = tuple(meta['img_shape'] for meta in img_metas) | |
| ori_shapes = tuple(meta['ori_shape'] for meta in img_metas) | |
| scale_factors = tuple(meta['scale_factor'] for meta in img_metas) | |
| # "ms" in variable names means multi-stage | |
| ms_bbox_result = {} | |
| ms_segm_result = {} | |
| ms_scores = [] | |
| rcnn_test_cfg = self.test_cfg | |
| rois = bbox2roi(proposal_list) | |
| for i in range(self.num_stages): | |
| bbox_results = self._bbox_forward(i, x, rois) | |
| # split batch bbox prediction back to each image | |
| cls_score = bbox_results['cls_score'] | |
| bbox_pred = bbox_results['bbox_pred'] | |
| num_proposals_per_img = tuple( | |
| len(proposals) for proposals in proposal_list) | |
| rois = rois.split(num_proposals_per_img, 0) | |
| cls_score = cls_score.split(num_proposals_per_img, 0) | |
| if isinstance(bbox_pred, torch.Tensor): | |
| bbox_pred = bbox_pred.split(num_proposals_per_img, 0) | |
| else: | |
| bbox_pred = self.bbox_head[i].bbox_pred_split( | |
| bbox_pred, num_proposals_per_img) | |
| ms_scores.append(cls_score) | |
| if i < self.num_stages - 1: | |
| bbox_label = [s[:, :-1].argmax(dim=1) for s in cls_score] | |
| rois = torch.cat([ | |
| self.bbox_head[i].regress_by_class(rois[j], bbox_label[j], | |
| bbox_pred[j], | |
| img_metas[j]) | |
| for j in range(num_imgs) | |
| ]) | |
| # average scores of each image by stages | |
| cls_score = [ | |
| sum([score[i] for score in ms_scores]) / float(len(ms_scores)) | |
| for i in range(num_imgs) | |
| ] | |
| # apply bbox post-processing to each image individually | |
| det_bboxes = [] | |
| det_labels = [] | |
| for i in range(num_imgs): | |
| det_bbox, det_label = self.bbox_head[-1].get_bboxes( | |
| rois[i], | |
| cls_score[i], | |
| bbox_pred[i], | |
| img_shapes[i], | |
| scale_factors[i], | |
| rescale=rescale, | |
| cfg=rcnn_test_cfg) | |
| det_bboxes.append(det_bbox) | |
| det_labels.append(det_label) | |
| if torch.onnx.is_in_onnx_export(): | |
| return det_bboxes, det_labels | |
| bbox_results = [ | |
| bbox2result(det_bboxes[i], det_labels[i], | |
| self.bbox_head[-1].num_classes) | |
| for i in range(num_imgs) | |
| ] | |
| ms_bbox_result['ensemble'] = bbox_results | |
| if self.with_mask: | |
| if all(det_bbox.shape[0] == 0 for det_bbox in det_bboxes): | |
| mask_classes = self.mask_head[-1].num_classes | |
| segm_results = [[[] for _ in range(mask_classes)] | |
| for _ in range(num_imgs)] | |
| else: | |
| if rescale and not isinstance(scale_factors[0], float): | |
| scale_factors = [ | |
| torch.from_numpy(scale_factor).to(det_bboxes[0].device) | |
| for scale_factor in scale_factors | |
| ] | |
| _bboxes = [ | |
| det_bboxes[i][:, :4] * | |
| scale_factors[i] if rescale else det_bboxes[i][:, :4] | |
| for i in range(len(det_bboxes)) | |
| ] | |
| mask_rois = bbox2roi(_bboxes) | |
| num_mask_rois_per_img = tuple( | |
| _bbox.size(0) for _bbox in _bboxes) | |
| aug_masks = [] | |
| for i in range(self.num_stages): | |
| mask_results = self._mask_forward(i, x, mask_rois) | |
| mask_pred = mask_results['mask_pred'] | |
| # split batch mask prediction back to each image | |
| mask_pred = mask_pred.split(num_mask_rois_per_img, 0) | |
| aug_masks.append( | |
| [m.sigmoid().cpu().numpy() for m in mask_pred]) | |
| # apply mask post-processing to each image individually | |
| segm_results = [] | |
| for i in range(num_imgs): | |
| if det_bboxes[i].shape[0] == 0: | |
| segm_results.append( | |
| [[] | |
| for _ in range(self.mask_head[-1].num_classes)]) | |
| else: | |
| aug_mask = [mask[i] for mask in aug_masks] | |
| merged_masks = merge_aug_masks( | |
| aug_mask, [[img_metas[i]]] * self.num_stages, | |
| rcnn_test_cfg) | |
| segm_result = self.mask_head[-1].get_seg_masks( | |
| merged_masks, _bboxes[i], det_labels[i], | |
| rcnn_test_cfg, ori_shapes[i], scale_factors[i], | |
| rescale) | |
| segm_results.append(segm_result) | |
| ms_segm_result['ensemble'] = segm_results | |
| if self.with_mask: | |
| results = list( | |
| zip(ms_bbox_result['ensemble'], ms_segm_result['ensemble'])) | |
| else: | |
| results = ms_bbox_result['ensemble'] | |
| return results | |
| def aug_test(self, features, proposal_list, img_metas, rescale=False): | |
| """Test with augmentations. | |
| If rescale is False, then returned bboxes and masks will fit the scale | |
| of imgs[0]. | |
| """ | |
| rcnn_test_cfg = self.test_cfg | |
| aug_bboxes = [] | |
| aug_scores = [] | |
| for x, img_meta in zip(features, img_metas): | |
| # only one image in the batch | |
| img_shape = img_meta[0]['img_shape'] | |
| scale_factor = img_meta[0]['scale_factor'] | |
| flip = img_meta[0]['flip'] | |
| flip_direction = img_meta[0]['flip_direction'] | |
| proposals = bbox_mapping(proposal_list[0][:, :4], img_shape, | |
| scale_factor, flip, flip_direction) | |
| # "ms" in variable names means multi-stage | |
| ms_scores = [] | |
| rois = bbox2roi([proposals]) | |
| for i in range(self.num_stages): | |
| bbox_results = self._bbox_forward(i, x, rois) | |
| ms_scores.append(bbox_results['cls_score']) | |
| if i < self.num_stages - 1: | |
| bbox_label = bbox_results['cls_score'][:, :-1].argmax( | |
| dim=1) | |
| rois = self.bbox_head[i].regress_by_class( | |
| rois, bbox_label, bbox_results['bbox_pred'], | |
| img_meta[0]) | |
| cls_score = sum(ms_scores) / float(len(ms_scores)) | |
| bboxes, scores = self.bbox_head[-1].get_bboxes( | |
| rois, | |
| cls_score, | |
| bbox_results['bbox_pred'], | |
| img_shape, | |
| scale_factor, | |
| rescale=False, | |
| cfg=None) | |
| aug_bboxes.append(bboxes) | |
| aug_scores.append(scores) | |
| # after merging, bboxes will be rescaled to the original image size | |
| merged_bboxes, merged_scores = merge_aug_bboxes( | |
| aug_bboxes, aug_scores, img_metas, rcnn_test_cfg) | |
| det_bboxes, det_labels = multiclass_nms(merged_bboxes, merged_scores, | |
| rcnn_test_cfg.score_thr, | |
| rcnn_test_cfg.nms, | |
| rcnn_test_cfg.max_per_img) | |
| bbox_result = bbox2result(det_bboxes, det_labels, | |
| self.bbox_head[-1].num_classes) | |
| if self.with_mask: | |
| if det_bboxes.shape[0] == 0: | |
| segm_result = [[[] | |
| for _ in range(self.mask_head[-1].num_classes)] | |
| ] | |
| else: | |
| aug_masks = [] | |
| aug_img_metas = [] | |
| for x, img_meta in zip(features, img_metas): | |
| img_shape = img_meta[0]['img_shape'] | |
| scale_factor = img_meta[0]['scale_factor'] | |
| flip = img_meta[0]['flip'] | |
| flip_direction = img_meta[0]['flip_direction'] | |
| _bboxes = bbox_mapping(det_bboxes[:, :4], img_shape, | |
| scale_factor, flip, flip_direction) | |
| mask_rois = bbox2roi([_bboxes]) | |
| for i in range(self.num_stages): | |
| mask_results = self._mask_forward(i, x, mask_rois) | |
| aug_masks.append( | |
| mask_results['mask_pred'].sigmoid().cpu().numpy()) | |
| aug_img_metas.append(img_meta) | |
| merged_masks = merge_aug_masks(aug_masks, aug_img_metas, | |
| self.test_cfg) | |
| ori_shape = img_metas[0][0]['ori_shape'] | |
| segm_result = self.mask_head[-1].get_seg_masks( | |
| merged_masks, | |
| det_bboxes, | |
| det_labels, | |
| rcnn_test_cfg, | |
| ori_shape, | |
| scale_factor=1.0, | |
| rescale=False) | |
| return [(bbox_result, segm_result)] | |
| else: | |
| return [bbox_result] | |