Source code for mmrotate.models.roi_heads.rotate_standard_roi_head
# Copyright (c) OpenMMLab. All rights reserved.
from abc import ABCMeta
import torch
from mmcv.runner import BaseModule
from mmdet.core import bbox2roi
from mmrotate.core import build_assigner, build_sampler, obb2xyxy, rbbox2result
from ..builder import (ROTATED_HEADS, build_head, build_roi_extractor,
build_shared_head)
[docs]@ROTATED_HEADS.register_module()
class RotatedStandardRoIHead(BaseModule, metaclass=ABCMeta):
"""Simplest base rotated roi head including one bbox head.
Args:
bbox_roi_extractor (dict, optional): Config of ``bbox_roi_extractor``.
bbox_head (dict, optional): Config of ``bbox_head``.
shared_head (dict, optional): Config of ``shared_head``.
train_cfg (dict, optional): Config of train.
test_cfg (dict, optional): Config of test.
pretrained (str, optional): Path of pretrained weight.
init_cfg (dict, optional): Config of initialization.
version (str, optional): Angle representations. Defaults to 'oc'.
"""
def __init__(self,
bbox_roi_extractor=None,
bbox_head=None,
shared_head=None,
train_cfg=None,
test_cfg=None,
pretrained=None,
init_cfg=None,
version='oc'):
super(RotatedStandardRoIHead, self).__init__(init_cfg)
self.train_cfg = train_cfg
self.test_cfg = test_cfg
self.version = version
if shared_head is not None:
shared_head.pretrained = pretrained
self.shared_head = build_shared_head(shared_head)
if bbox_head is not None:
self.init_bbox_head(bbox_roi_extractor, bbox_head)
self.init_assigner_sampler()
self.with_bbox = True if bbox_head is not None else False
self.with_shared_head = True if shared_head is not None else False
[docs] 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)
[docs] def init_bbox_head(self, bbox_roi_extractor, bbox_head):
"""Initialize ``bbox_head``.
Args:
bbox_roi_extractor (dict): Config of ``bbox_roi_extractor``.
bbox_head (dict): Config of ``bbox_head``.
"""
self.bbox_roi_extractor = build_roi_extractor(bbox_roi_extractor)
self.bbox_head = build_head(bbox_head)
[docs] def forward_dummy(self, x, proposals):
"""Dummy forward function.
Args:
x (list[Tensors]): list of multi-level img features.
proposals (list[Tensors]): list of region proposals.
Returns:
list[Tensors]: list of region of interest.
"""
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'])
return outs
[docs] 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, 5) in [cx, cy, w, h, a] 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. Always
set to None.
Returns:
dict[str, Tensor]: a dictionary of loss components.
"""
# assign gts and sample proposals
if self.with_bbox:
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):
gt_hbboxes = obb2xyxy(gt_bboxes[i], self.version)
assign_result = self.bbox_assigner.assign(
proposal_list[i], gt_hbboxes, gt_bboxes_ignore[i],
gt_labels[i])
sampling_result = self.bbox_sampler.sample(
assign_result,
proposal_list[i],
gt_hbboxes,
gt_labels[i],
feats=[lvl_feat[i][None] for lvl_feat in x])
if gt_bboxes[i].numel() == 0:
sampling_result.pos_gt_bboxes = gt_bboxes[i].new(
(0, gt_bboxes[0].size(-1))).zero_()
else:
sampling_result.pos_gt_bboxes = \
gt_bboxes[i][sampling_result.pos_assigned_gt_inds, :]
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'])
return losses
def _bbox_forward(self, x, rois):
"""Box head forward function used in both training and testing.
Args:
x (list[Tensor]): list of multi-level img features.
rois (list[Tensors]): list of region of interests.
Returns:
dict[str, Tensor]: a dictionary of bbox_results.
"""
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.
Args:
x (list[Tensor]): list of multi-level img features.
sampling_results (list[Tensor]): list of sampling results.
gt_bboxes (list[Tensor]): Ground truth bboxes for each image with
shape (num_gts, 5) in [cx, cy, w, h, a] format.
gt_labels (list[Tensor]): class indices corresponding to each box
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'.
Returns:
dict[str, Tensor]: a dictionary of bbox_results.
"""
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
[docs] async def async_simple_test(self,
x,
proposal_list,
img_metas,
rescale=False):
"""Async test without augmentation.
Args:
x (list[Tensor]): list of multi-level img features.
proposal_list (list[Tensors]): list of region proposals.
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'.
rescale (bool): If True, return boxes in original image space.
Default: False.
Returns:
dict[str, Tensor]: a dictionary of bbox_results.
"""
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 = rbbox2result(det_bboxes, det_labels,
self.bbox_head.num_classes)
return bbox_results
[docs] def simple_test(self, x, proposal_list, img_metas, rescale=False):
"""Test without augmentation.
Args:
x (list[Tensor]): list of multi-level img features.
proposal_list (list[Tensors]): list of region proposals.
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'.
rescale (bool): If True, return boxes in original image space.
Default: False.
Returns:
dict[str, Tensor]: a dictionary of bbox_results.
"""
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)
bbox_results = [
rbbox2result(det_bboxes[i], det_labels[i],
self.bbox_head.num_classes)
for i in range(len(det_bboxes))
]
return bbox_results
[docs] def aug_test(self, x, proposal_list, img_metas, rescale=False):
"""Test with augmentations."""
raise NotImplementedError
[docs] def simple_test_bboxes(self,
x,
img_metas,
proposals,
rcnn_test_cfg,
rescale=False):
"""Test only det bboxes without augmentation.
Args:
x (tuple[Tensor]): Feature maps of all scale level.
img_metas (list[dict]): Image meta info.
proposals (List[Tensor]): Region proposals.
rcnn_test_cfg (obj:`ConfigDict`): `test_cfg` of R-CNN.
rescale (bool): If True, return boxes in original image space.
Default: False.
Returns:
tuple[list[Tensor], list[Tensor]]: The first list contains \
the boxes of the corresponding image in a batch, each \
tensor has the shape (num_boxes, 5) and last dimension \
5 represent (tl_x, tl_y, br_x, br_y, score). Each Tensor \
in the second list is the labels with shape (num_boxes, ). \
The length of both lists should be equal to batch_size.
"""
rois = bbox2roi(proposals)
if rois.shape[0] == 0:
batch_size = len(proposals)
det_bbox = rois.new_zeros(0, 5)
det_label = rois.new_zeros((0, ), dtype=torch.long)
if rcnn_test_cfg is None:
det_bbox = det_bbox[:, :4]
det_label = rois.new_zeros(
(0, self.bbox_head.fc_cls.out_features))
# There is no proposal in the whole batch
return [det_bbox] * batch_size, [det_label] * batch_size
bbox_results = self._bbox_forward(x, rois)
img_shapes = tuple(meta['img_shape'] for meta in img_metas)
scale_factors = tuple(meta['scale_factor'] for meta in img_metas)
# 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 proposals)
rois = rois.split(num_proposals_per_img, 0)
cls_score = cls_score.split(num_proposals_per_img, 0)
# some detector with_reg is False, bbox_pred will be None
if bbox_pred is not None:
# TODO move this to a sabl_roi_head
# the bbox prediction of some detectors like SABL is not Tensor
if isinstance(bbox_pred, torch.Tensor):
bbox_pred = bbox_pred.split(num_proposals_per_img, 0)
else:
bbox_pred = self.bbox_head.bbox_pred_split(
bbox_pred, num_proposals_per_img)
else:
bbox_pred = (None, ) * len(proposals)
# apply bbox post-processing to each image individually
det_bboxes = []
det_labels = []
for i in range(len(proposals)):
if rois[i].shape[0] == 0:
# There is no proposal in the single image
det_bbox = rois[i].new_zeros(0, 5)
det_label = rois[i].new_zeros((0, ), dtype=torch.long)
if rcnn_test_cfg is None:
det_bbox = det_bbox[:, :4]
det_label = rois[i].new_zeros(
(0, self.bbox_head.fc_cls.out_features))
else:
det_bbox, det_label = self.bbox_head.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)
return det_bboxes, det_labels