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| import torch | |
| import torch.nn.functional as F | |
| from mmdet.core import (bbox2result, bbox2roi, bbox_mapping, merge_aug_bboxes, | |
| merge_aug_masks, multiclass_nms) | |
| from ..builder import HEADS, build_head, build_roi_extractor | |
| from .cascade_roi_head import CascadeRoIHead | |
| class SCNetRoIHead(CascadeRoIHead): | |
| """RoIHead for `SCNet <https://arxiv.org/abs/2012.10150>`_. | |
| Args: | |
| num_stages (int): number of cascade stages. | |
| stage_loss_weights (list): loss weight of cascade stages. | |
| semantic_roi_extractor (dict): config to init semantic roi extractor. | |
| semantic_head (dict): config to init semantic head. | |
| feat_relay_head (dict): config to init feature_relay_head. | |
| glbctx_head (dict): config to init global context head. | |
| """ | |
| def __init__(self, | |
| num_stages, | |
| stage_loss_weights, | |
| semantic_roi_extractor=None, | |
| semantic_head=None, | |
| feat_relay_head=None, | |
| glbctx_head=None, | |
| **kwargs): | |
| super(SCNetRoIHead, self).__init__(num_stages, stage_loss_weights, | |
| **kwargs) | |
| assert self.with_bbox and self.with_mask | |
| assert not self.with_shared_head # shared head is not supported | |
| if semantic_head is not None: | |
| self.semantic_roi_extractor = build_roi_extractor( | |
| semantic_roi_extractor) | |
| self.semantic_head = build_head(semantic_head) | |
| if feat_relay_head is not None: | |
| self.feat_relay_head = build_head(feat_relay_head) | |
| if glbctx_head is not None: | |
| self.glbctx_head = build_head(glbctx_head) | |
| def init_mask_head(self, mask_roi_extractor, mask_head): | |
| """Initialize ``mask_head``""" | |
| if mask_roi_extractor is not None: | |
| self.mask_roi_extractor = build_roi_extractor(mask_roi_extractor) | |
| self.mask_head = build_head(mask_head) | |
| def init_weights(self, pretrained): | |
| """Initialize the weights in head. | |
| Args: | |
| pretrained (str, optional): Path to pre-trained weights. | |
| Defaults to None. | |
| """ | |
| 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: | |
| self.mask_roi_extractor.init_weights() | |
| self.mask_head.init_weights() | |
| if self.with_semantic: | |
| self.semantic_head.init_weights() | |
| if self.with_glbctx: | |
| self.glbctx_head.init_weights() | |
| if self.with_feat_relay: | |
| self.feat_relay_head.init_weights() | |
| def with_semantic(self): | |
| """bool: whether the head has semantic head""" | |
| return hasattr(self, | |
| 'semantic_head') and self.semantic_head is not None | |
| def with_feat_relay(self): | |
| """bool: whether the head has feature relay head""" | |
| return (hasattr(self, 'feat_relay_head') | |
| and self.feat_relay_head is not None) | |
| def with_glbctx(self): | |
| """bool: whether the head has global context head""" | |
| return hasattr(self, 'glbctx_head') and self.glbctx_head is not None | |
| def _fuse_glbctx(self, roi_feats, glbctx_feat, rois): | |
| """Fuse global context feats with roi feats.""" | |
| assert roi_feats.size(0) == rois.size(0) | |
| img_inds = torch.unique(rois[:, 0].cpu(), sorted=True).long() | |
| fused_feats = torch.zeros_like(roi_feats) | |
| for img_id in img_inds: | |
| inds = (rois[:, 0] == img_id.item()) | |
| fused_feats[inds] = roi_feats[inds] + glbctx_feat[img_id] | |
| return fused_feats | |
| def _slice_pos_feats(self, feats, sampling_results): | |
| """Get features from pos rois.""" | |
| num_rois = [res.bboxes.size(0) for res in sampling_results] | |
| num_pos_rois = [res.pos_bboxes.size(0) for res in sampling_results] | |
| inds = torch.zeros(sum(num_rois), dtype=torch.bool) | |
| start = 0 | |
| for i in range(len(num_rois)): | |
| start = 0 if i == 0 else start + num_rois[i - 1] | |
| stop = start + num_pos_rois[i] | |
| inds[start:stop] = 1 | |
| sliced_feats = feats[inds] | |
| return sliced_feats | |
| def _bbox_forward(self, | |
| stage, | |
| x, | |
| rois, | |
| semantic_feat=None, | |
| glbctx_feat=None): | |
| """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[:len(bbox_roi_extractor.featmap_strides)], rois) | |
| if self.with_semantic and semantic_feat is not None: | |
| bbox_semantic_feat = self.semantic_roi_extractor([semantic_feat], | |
| rois) | |
| if bbox_semantic_feat.shape[-2:] != bbox_feats.shape[-2:]: | |
| bbox_semantic_feat = F.adaptive_avg_pool2d( | |
| bbox_semantic_feat, bbox_feats.shape[-2:]) | |
| bbox_feats += bbox_semantic_feat | |
| if self.with_glbctx and glbctx_feat is not None: | |
| bbox_feats = self._fuse_glbctx(bbox_feats, glbctx_feat, rois) | |
| cls_score, bbox_pred, relayed_feat = bbox_head( | |
| bbox_feats, return_shared_feat=True) | |
| bbox_results = dict( | |
| cls_score=cls_score, | |
| bbox_pred=bbox_pred, | |
| relayed_feat=relayed_feat) | |
| return bbox_results | |
| def _mask_forward(self, | |
| x, | |
| rois, | |
| semantic_feat=None, | |
| glbctx_feat=None, | |
| relayed_feat=None): | |
| """Mask head forward function used in both training and testing.""" | |
| mask_feats = self.mask_roi_extractor( | |
| x[:self.mask_roi_extractor.num_inputs], rois) | |
| if self.with_semantic and semantic_feat is not None: | |
| mask_semantic_feat = self.semantic_roi_extractor([semantic_feat], | |
| rois) | |
| if mask_semantic_feat.shape[-2:] != mask_feats.shape[-2:]: | |
| mask_semantic_feat = F.adaptive_avg_pool2d( | |
| mask_semantic_feat, mask_feats.shape[-2:]) | |
| mask_feats += mask_semantic_feat | |
| if self.with_glbctx and glbctx_feat is not None: | |
| mask_feats = self._fuse_glbctx(mask_feats, glbctx_feat, rois) | |
| if self.with_feat_relay and relayed_feat is not None: | |
| mask_feats = mask_feats + relayed_feat | |
| mask_pred = self.mask_head(mask_feats) | |
| mask_results = dict(mask_pred=mask_pred) | |
| return mask_results | |
| def _bbox_forward_train(self, | |
| stage, | |
| x, | |
| sampling_results, | |
| gt_bboxes, | |
| gt_labels, | |
| rcnn_train_cfg, | |
| semantic_feat=None, | |
| glbctx_feat=None): | |
| """Run forward function and calculate loss for box head in training.""" | |
| bbox_head = self.bbox_head[stage] | |
| rois = bbox2roi([res.bboxes for res in sampling_results]) | |
| bbox_results = self._bbox_forward( | |
| stage, | |
| x, | |
| rois, | |
| semantic_feat=semantic_feat, | |
| glbctx_feat=glbctx_feat) | |
| bbox_targets = bbox_head.get_targets(sampling_results, gt_bboxes, | |
| gt_labels, rcnn_train_cfg) | |
| loss_bbox = bbox_head.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_train(self, | |
| x, | |
| sampling_results, | |
| gt_masks, | |
| rcnn_train_cfg, | |
| semantic_feat=None, | |
| glbctx_feat=None, | |
| relayed_feat=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( | |
| x, | |
| pos_rois, | |
| semantic_feat=semantic_feat, | |
| glbctx_feat=glbctx_feat, | |
| relayed_feat=relayed_feat) | |
| mask_targets = self.mask_head.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.loss(mask_results['mask_pred'], | |
| mask_targets, pos_labels) | |
| mask_results = 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, | |
| gt_semantic_seg=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`. | |
| proposal_list (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. | |
| gt_semantic_seg (None, list[Tensor]): semantic segmentation masks | |
| used if the architecture supports semantic segmentation task. | |
| Returns: | |
| dict[str, Tensor]: a dictionary of loss components | |
| """ | |
| losses = dict() | |
| # semantic segmentation branch | |
| if self.with_semantic: | |
| semantic_pred, semantic_feat = self.semantic_head(x) | |
| loss_seg = self.semantic_head.loss(semantic_pred, gt_semantic_seg) | |
| losses['loss_semantic_seg'] = loss_seg | |
| else: | |
| semantic_feat = None | |
| # global context branch | |
| if self.with_glbctx: | |
| mc_pred, glbctx_feat = self.glbctx_head(x) | |
| loss_glbctx = self.glbctx_head.loss(mc_pred, gt_labels) | |
| losses['loss_glbctx'] = loss_glbctx | |
| else: | |
| glbctx_feat = None | |
| 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 = [] | |
| 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_results = \ | |
| self._bbox_forward_train( | |
| i, x, sampling_results, gt_bboxes, gt_labels, | |
| rcnn_train_cfg, semantic_feat, glbctx_feat) | |
| roi_labels = bbox_results['bbox_targets'][0] | |
| for name, value in bbox_results['loss_bbox'].items(): | |
| losses[f's{i}.{name}'] = ( | |
| value * lw if 'loss' in name else value) | |
| # refine boxes | |
| if i < self.num_stages - 1: | |
| pos_is_gts = [res.pos_is_gt for res in sampling_results] | |
| with torch.no_grad(): | |
| proposal_list = self.bbox_head[i].refine_bboxes( | |
| bbox_results['rois'], roi_labels, | |
| bbox_results['bbox_pred'], pos_is_gts, img_metas) | |
| if self.with_feat_relay: | |
| relayed_feat = self._slice_pos_feats(bbox_results['relayed_feat'], | |
| sampling_results) | |
| relayed_feat = self.feat_relay_head(relayed_feat) | |
| else: | |
| relayed_feat = None | |
| mask_results = self._mask_forward_train(x, sampling_results, gt_masks, | |
| rcnn_train_cfg, semantic_feat, | |
| glbctx_feat, relayed_feat) | |
| mask_lw = sum(self.stage_loss_weights) | |
| losses['loss_mask'] = mask_lw * mask_results['loss_mask'] | |
| return losses | |
| def simple_test(self, x, proposal_list, img_metas, rescale=False): | |
| """Test without augmentation.""" | |
| if self.with_semantic: | |
| _, semantic_feat = self.semantic_head(x) | |
| else: | |
| semantic_feat = None | |
| if self.with_glbctx: | |
| mc_pred, glbctx_feat = self.glbctx_head(x) | |
| else: | |
| glbctx_feat = None | |
| 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_scores = [] | |
| rcnn_test_cfg = self.test_cfg | |
| rois = bbox2roi(proposal_list) | |
| for i in range(self.num_stages): | |
| bbox_head = self.bbox_head[i] | |
| bbox_results = self._bbox_forward( | |
| i, | |
| x, | |
| rois, | |
| semantic_feat=semantic_feat, | |
| glbctx_feat=glbctx_feat) | |
| # 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(p) for p in proposal_list) | |
| rois = rois.split(num_proposals_per_img, 0) | |
| cls_score = cls_score.split(num_proposals_per_img, 0) | |
| bbox_pred = bbox_pred.split(num_proposals_per_img, 0) | |
| 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([ | |
| bbox_head.regress_by_class(rois[i], bbox_label[i], | |
| bbox_pred[i], img_metas[i]) | |
| for i 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) | |
| det_bbox_results = [ | |
| bbox2result(det_bboxes[i], det_labels[i], | |
| self.bbox_head[-1].num_classes) | |
| for i in range(num_imgs) | |
| ] | |
| if self.with_mask: | |
| if all(det_bbox.shape[0] == 0 for det_bbox in det_bboxes): | |
| mask_classes = self.mask_head.num_classes | |
| det_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] | |
| for i in range(num_imgs) | |
| ] | |
| mask_rois = bbox2roi(_bboxes) | |
| # get relay feature on mask_rois | |
| bbox_results = self._bbox_forward( | |
| -1, | |
| x, | |
| mask_rois, | |
| semantic_feat=semantic_feat, | |
| glbctx_feat=glbctx_feat) | |
| relayed_feat = bbox_results['relayed_feat'] | |
| relayed_feat = self.feat_relay_head(relayed_feat) | |
| mask_results = self._mask_forward( | |
| x, | |
| mask_rois, | |
| semantic_feat=semantic_feat, | |
| glbctx_feat=glbctx_feat, | |
| relayed_feat=relayed_feat) | |
| mask_pred = mask_results['mask_pred'] | |
| # split batch mask prediction back to each image | |
| num_bbox_per_img = tuple(len(_bbox) for _bbox in _bboxes) | |
| mask_preds = mask_pred.split(num_bbox_per_img, 0) | |
| # apply mask post-processing to each image individually | |
| det_segm_results = [] | |
| for i in range(num_imgs): | |
| if det_bboxes[i].shape[0] == 0: | |
| det_segm_results.append( | |
| [[] for _ in range(self.mask_head.num_classes)]) | |
| else: | |
| segm_result = self.mask_head.get_seg_masks( | |
| mask_preds[i], _bboxes[i], det_labels[i], | |
| self.test_cfg, ori_shapes[i], scale_factors[i], | |
| rescale) | |
| det_segm_results.append(segm_result) | |
| # return results | |
| if self.with_mask: | |
| return list(zip(det_bbox_results, det_segm_results)) | |
| else: | |
| return det_bbox_results | |
| def aug_test(self, img_feats, proposal_list, img_metas, rescale=False): | |
| if self.with_semantic: | |
| semantic_feats = [ | |
| self.semantic_head(feat)[1] for feat in img_feats | |
| ] | |
| else: | |
| semantic_feats = [None] * len(img_metas) | |
| if self.with_glbctx: | |
| glbctx_feats = [self.glbctx_head(feat)[1] for feat in img_feats] | |
| else: | |
| glbctx_feats = [None] * len(img_metas) | |
| rcnn_test_cfg = self.test_cfg | |
| aug_bboxes = [] | |
| aug_scores = [] | |
| for x, img_meta, semantic_feat, glbctx_feat in zip( | |
| img_feats, img_metas, semantic_feats, glbctx_feats): | |
| # 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'] | |
| proposals = bbox_mapping(proposal_list[0][:, :4], img_shape, | |
| scale_factor, flip) | |
| # "ms" in variable names means multi-stage | |
| ms_scores = [] | |
| rois = bbox2roi([proposals]) | |
| for i in range(self.num_stages): | |
| bbox_head = self.bbox_head[i] | |
| bbox_results = self._bbox_forward( | |
| i, | |
| x, | |
| rois, | |
| semantic_feat=semantic_feat, | |
| glbctx_feat=glbctx_feat) | |
| ms_scores.append(bbox_results['cls_score']) | |
| if i < self.num_stages - 1: | |
| bbox_label = bbox_results['cls_score'].argmax(dim=1) | |
| rois = bbox_head.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) | |
| det_bbox_results = bbox2result(det_bboxes, det_labels, | |
| self.bbox_head[-1].num_classes) | |
| if self.with_mask: | |
| if det_bboxes.shape[0] == 0: | |
| det_segm_results = [[] | |
| for _ in range(self.mask_head.num_classes)] | |
| else: | |
| aug_masks = [] | |
| for x, img_meta, semantic_feat, glbctx_feat in zip( | |
| img_feats, img_metas, semantic_feats, glbctx_feats): | |
| img_shape = img_meta[0]['img_shape'] | |
| scale_factor = img_meta[0]['scale_factor'] | |
| flip = img_meta[0]['flip'] | |
| _bboxes = bbox_mapping(det_bboxes[:, :4], img_shape, | |
| scale_factor, flip) | |
| mask_rois = bbox2roi([_bboxes]) | |
| # get relay feature on mask_rois | |
| bbox_results = self._bbox_forward( | |
| -1, | |
| x, | |
| mask_rois, | |
| semantic_feat=semantic_feat, | |
| glbctx_feat=glbctx_feat) | |
| relayed_feat = bbox_results['relayed_feat'] | |
| relayed_feat = self.feat_relay_head(relayed_feat) | |
| mask_results = self._mask_forward( | |
| x, | |
| mask_rois, | |
| semantic_feat=semantic_feat, | |
| glbctx_feat=glbctx_feat, | |
| relayed_feat=relayed_feat) | |
| mask_pred = mask_results['mask_pred'] | |
| aug_masks.append(mask_pred.sigmoid().cpu().numpy()) | |
| merged_masks = merge_aug_masks(aug_masks, img_metas, | |
| self.test_cfg) | |
| ori_shape = img_metas[0][0]['ori_shape'] | |
| det_segm_results = self.mask_head.get_seg_masks( | |
| merged_masks, | |
| det_bboxes, | |
| det_labels, | |
| rcnn_test_cfg, | |
| ori_shape, | |
| scale_factor=1.0, | |
| rescale=False) | |
| return [(det_bbox_results, det_segm_results)] | |
| else: | |
| return [det_bbox_results] | |