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import torch
from mmdet.core import bbox2result, bbox2roi, build_assigner, build_sampler
from ..builder import HEADS, build_head, build_roi_extractor
from .base_roi_head import BaseRoIHead
from .test_mixins import BBoxTestMixin, MaskTestMixin
@HEADS.register_module()
class StandardRoIHead(BaseRoIHead, BBoxTestMixin, MaskTestMixin):
"""Simplest base roi head including one bbox head and one mask head."""
def init_assigner_sampler(self):
"""Initialize assigner and sampler."""
self.bbox_assigner = None
self.bbox_sampler = None
if self.train_cfg:
self.bbox_assigner = build_assigner(self.train_cfg.assigner)
self.bbox_sampler = build_sampler(
self.train_cfg.sampler, context=self)
def init_bbox_head(self, bbox_roi_extractor, bbox_head):
"""Initialize ``bbox_head``"""
self.bbox_roi_extractor = build_roi_extractor(bbox_roi_extractor)
self.bbox_head = build_head(bbox_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.share_roi_extractor = False
else:
self.share_roi_extractor = True
self.mask_roi_extractor = self.bbox_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.
"""
if self.with_shared_head:
self.shared_head.init_weights(pretrained=pretrained)
if self.with_bbox:
self.bbox_roi_extractor.init_weights()
self.bbox_head.init_weights()
if self.with_mask:
self.mask_head.init_weights()
if not self.share_roi_extractor:
self.mask_roi_extractor.init_weights()
def forward_dummy(self, x, proposals):
"""Dummy forward function."""
# bbox head
outs = ()
rois = bbox2roi([proposals])
if self.with_bbox:
bbox_results = self._bbox_forward(x, rois)
outs = outs + (bbox_results['cls_score'],
bbox_results['bbox_pred'])
# mask head
if self.with_mask:
mask_rois = rois[:100]
mask_results = self._mask_forward(x, mask_rois)
outs = outs + (mask_results['mask_pred'], )
return outs
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
"""
# assign gts and sample proposals
if self.with_bbox or self.with_mask:
num_imgs = len(img_metas)
if gt_bboxes_ignore is None:
gt_bboxes_ignore = [None for _ in range(num_imgs)]
sampling_results = []
for i in range(num_imgs):
assign_result = self.bbox_assigner.assign(
proposal_list[i], gt_bboxes[i], gt_bboxes_ignore[i],
gt_labels[i])
sampling_result = self.bbox_sampler.sample(
assign_result,
proposal_list[i],
gt_bboxes[i],
gt_labels[i],
feats=[lvl_feat[i][None] for lvl_feat in x])
sampling_results.append(sampling_result)
losses = dict()
# bbox head forward and loss
if self.with_bbox:
bbox_results = self._bbox_forward_train(x, sampling_results,
gt_bboxes, gt_labels,
img_metas)
losses.update(bbox_results['loss_bbox'])
# mask head forward and loss
if self.with_mask:
mask_results = self._mask_forward_train(x, sampling_results,
bbox_results['bbox_feats'],
gt_masks, img_metas)
losses.update(mask_results['loss_mask'])
return losses
def _bbox_forward(self, x, rois):
"""Box head forward function used in both training and testing."""
# TODO: a more flexible way to decide which feature maps to use
bbox_feats = self.bbox_roi_extractor(
x[:self.bbox_roi_extractor.num_inputs], rois)
if self.with_shared_head:
bbox_feats = self.shared_head(bbox_feats)
cls_score, bbox_pred = self.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, x, sampling_results, gt_bboxes, gt_labels,
img_metas):
"""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(x, rois)
bbox_targets = self.bbox_head.get_targets(sampling_results, gt_bboxes,
gt_labels, self.train_cfg)
loss_bbox = self.bbox_head.loss(bbox_results['cls_score'],
bbox_results['bbox_pred'], rois,
*bbox_targets)
bbox_results.update(loss_bbox=loss_bbox)
return bbox_results
def _mask_forward_train(self, x, sampling_results, bbox_feats, gt_masks,
img_metas):
"""Run forward function and calculate loss for mask head in
training."""
if not self.share_roi_extractor:
pos_rois = bbox2roi([res.pos_bboxes for res in sampling_results])
mask_results = self._mask_forward(x, pos_rois)
else:
pos_inds = []
device = bbox_feats.device
for res in sampling_results:
pos_inds.append(
torch.ones(
res.pos_bboxes.shape[0],
device=device,
dtype=torch.uint8))
pos_inds.append(
torch.zeros(
res.neg_bboxes.shape[0],
device=device,
dtype=torch.uint8))
pos_inds = torch.cat(pos_inds)
mask_results = self._mask_forward(
x, pos_inds=pos_inds, bbox_feats=bbox_feats)
mask_targets = self.mask_head.get_targets(sampling_results, gt_masks,
self.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.update(loss_mask=loss_mask, mask_targets=mask_targets)
return mask_results
def _mask_forward(self, x, rois=None, pos_inds=None, bbox_feats=None):
"""Mask head forward function used in both training and testing."""
assert ((rois is not None) ^
(pos_inds is not None and bbox_feats is not None))
if rois is not None:
mask_feats = self.mask_roi_extractor(
x[:self.mask_roi_extractor.num_inputs], rois)
if self.with_shared_head:
mask_feats = self.shared_head(mask_feats)
else:
assert bbox_feats is not None
mask_feats = bbox_feats[pos_inds]
mask_pred = self.mask_head(mask_feats)
mask_results = dict(mask_pred=mask_pred, mask_feats=mask_feats)
return mask_results
async def async_simple_test(self,
x,
proposal_list,
img_metas,
proposals=None,
rescale=False):
"""Async test without augmentation."""
assert self.with_bbox, 'Bbox head must be implemented.'
det_bboxes, det_labels = await self.async_test_bboxes(
x, img_metas, proposal_list, self.test_cfg, rescale=rescale)
bbox_results = bbox2result(det_bboxes, det_labels,
self.bbox_head.num_classes)
if not self.with_mask:
return bbox_results
else:
segm_results = await self.async_test_mask(
x,
img_metas,
det_bboxes,
det_labels,
rescale=rescale,
mask_test_cfg=self.test_cfg.get('mask'))
return bbox_results, segm_results
def simple_test(self,
x,
proposal_list,
img_metas,
proposals=None,
rescale=False):
"""Test without augmentation."""
assert self.with_bbox, 'Bbox head must be implemented.'
det_bboxes, det_labels = self.simple_test_bboxes(
x, img_metas, proposal_list, self.test_cfg, rescale=rescale)
if torch.onnx.is_in_onnx_export():
if self.with_mask:
segm_results = self.simple_test_mask(
x, img_metas, det_bboxes, det_labels, rescale=rescale)
return det_bboxes, det_labels, segm_results
else:
return det_bboxes, det_labels
bbox_results = [
bbox2result(det_bboxes[i], det_labels[i],
self.bbox_head.num_classes)
for i in range(len(det_bboxes))
]
if not self.with_mask:
return bbox_results
else:
segm_results = self.simple_test_mask(
x, img_metas, det_bboxes, det_labels, rescale=rescale)
return list(zip(bbox_results, segm_results))
def aug_test(self, x, 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].
"""
det_bboxes, det_labels = self.aug_test_bboxes(x, img_metas,
proposal_list,
self.test_cfg)
if rescale:
_det_bboxes = det_bboxes
else:
_det_bboxes = det_bboxes.clone()
_det_bboxes[:, :4] *= det_bboxes.new_tensor(
img_metas[0][0]['scale_factor'])
bbox_results = bbox2result(_det_bboxes, det_labels,
self.bbox_head.num_classes)
# det_bboxes always keep the original scale
if self.with_mask:
segm_results = self.aug_test_mask(x, img_metas, det_bboxes,
det_labels)
return [(bbox_results, segm_results)]
else:
return [bbox_results]
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