Source code for mmrotate.models.dense_heads.rotated_atss_head
# Copyright (c) OpenMMLab. All rights reserved.
import torch
from mmdet.core import images_to_levels, multi_apply, unmap
from mmrotate.core import obb2hbb, rotated_anchor_inside_flags
from ..builder import ROTATED_HEADS
from .rotated_retina_head import RotatedRetinaHead
from .utils import get_num_level_anchors_inside
[docs]@ROTATED_HEADS.register_module()
class RotatedATSSHead(RotatedRetinaHead):
r"""An anchor-based head used in `ATSS
<https://arxiv.org/abs/1912.02424>`_.
The head contains two subnetworks. The first classifies anchor boxes and
the second regresses deltas for the anchors.
""" # noqa: W605
def _get_targets_single(self,
flat_anchors,
valid_flags,
num_level_anchors,
gt_bboxes,
gt_bboxes_ignore,
gt_labels,
img_meta,
label_channels=1,
unmap_outputs=True):
"""Compute regression and classification targets for anchors in a
single image.
Args:
flat_anchors (torch.Tensor): Multi-level anchors of the image,
which are concatenated into a single tensor of shape \
(num_anchors, 5)
valid_flags (torch.Tensor): Multi level valid flags of the image,
which are concatenated into a single tensor of \
shape (num_anchors,).
num_level_anchors (torch.Tensor): Number of anchors of each \
scale level
gt_bboxes (torch.Tensor): Ground truth bboxes of the image,
shape (num_gts, 5).
img_meta (dict): Meta info of the image.
gt_bboxes_ignore (torch.Tensor): Ground truth bboxes to be \
ignored, shape (num_ignored_gts, 5).
img_meta (dict): Meta info of the image.
gt_labels (torch.Tensor): Ground truth labels of each box,
shape (num_gts,).
label_channels (int): Channel of label.
unmap_outputs (bool): Whether to map outputs back to the original \
set of anchors.
Returns:
tuple:
labels_list (list[Tensor]): Labels of all anchor
label_weights_list (list[Tensor]): Label weights of all anchor
bbox_targets_list (list[Tensor]): BBox targets of all anchor
bbox_weights_list (list[Tensor]): BBox weights of all anchor
pos_inds (int): Indices of positive anchor
neg_inds (int): Indices of negative anchor
sampling_result: object `SamplingResult`, sampling result.
"""
inside_flags = rotated_anchor_inside_flags(
flat_anchors, valid_flags, img_meta['img_shape'][:2],
self.train_cfg.allowed_border)
if not inside_flags.any():
return (None, ) * 7
# assign gt and sample anchors
anchors = flat_anchors[inside_flags, :]
num_level_anchors_inside = get_num_level_anchors_inside(
num_level_anchors, inside_flags)
if self.assign_by_circumhbbox is not None:
gt_bboxes_assign = obb2hbb(gt_bboxes, self.assign_by_circumhbbox)
assign_result = self.assigner.assign(
anchors, num_level_anchors_inside, gt_bboxes_assign,
gt_bboxes_ignore, None if self.sampling else gt_labels)
else:
assign_result = self.assigner.assign(
anchors, num_level_anchors_inside, gt_bboxes, gt_bboxes_ignore,
None if self.sampling else gt_labels)
sampling_result = self.sampler.sample(assign_result, anchors,
gt_bboxes)
num_valid_anchors = anchors.shape[0]
bbox_targets = torch.zeros_like(anchors)
bbox_weights = torch.zeros_like(anchors)
labels = anchors.new_full((num_valid_anchors, ),
self.num_classes,
dtype=torch.long)
label_weights = anchors.new_zeros(num_valid_anchors, dtype=torch.float)
pos_inds = sampling_result.pos_inds
neg_inds = sampling_result.neg_inds
if len(pos_inds) > 0:
if not self.reg_decoded_bbox:
pos_bbox_targets = self.bbox_coder.encode(
sampling_result.pos_bboxes, sampling_result.pos_gt_bboxes)
else:
pos_bbox_targets = sampling_result.pos_gt_bboxes
bbox_targets[pos_inds, :] = pos_bbox_targets
bbox_weights[pos_inds, :] = 1.0
if gt_labels is None:
# Only rpn gives gt_labels as None
# Foreground is the first class since v2.5.0
labels[pos_inds] = 0
else:
labels[pos_inds] = gt_labels[
sampling_result.pos_assigned_gt_inds]
if self.train_cfg.pos_weight <= 0:
label_weights[pos_inds] = 1.0
else:
label_weights[pos_inds] = self.train_cfg.pos_weight
if len(neg_inds) > 0:
label_weights[neg_inds] = 1.0
# map up to original set of anchors
if unmap_outputs:
num_total_anchors = flat_anchors.size(0)
labels = unmap(
labels, num_total_anchors, inside_flags,
fill=self.num_classes) # fill bg label
label_weights = unmap(label_weights, num_total_anchors,
inside_flags)
bbox_targets = unmap(bbox_targets, num_total_anchors, inside_flags)
bbox_weights = unmap(bbox_weights, num_total_anchors, inside_flags)
return (labels, label_weights, bbox_targets, bbox_weights, pos_inds,
neg_inds, sampling_result)
[docs] def get_targets(self,
anchor_list,
valid_flag_list,
gt_bboxes_list,
img_metas,
gt_bboxes_ignore_list=None,
gt_labels_list=None,
label_channels=1,
unmap_outputs=True,
return_sampling_results=False):
"""Compute regression and classification targets for anchors in
multiple images.
Args:
anchor_list (list[list[Tensor]]): Multi level anchors of each \
image. The outer list indicates images, and the inner list \
corresponds to feature levels of the image. Each element of \
the inner list is a tensor of shape (num_anchors, 5).
valid_flag_list (list[list[Tensor]]): Multi level valid flags of \
each image. The outer list indicates images, and the inner \
list corresponds to feature levels of the image. Each element \
of the inner list is a tensor of shape (num_anchors, )
gt_bboxes_list (list[Tensor]): Ground truth bboxes of each image.
img_metas (list[dict]): Meta info of each image.
gt_bboxes_ignore_list (list[Tensor]): Ground truth bboxes to be \
ignored.
gt_labels_list (list[Tensor]): Ground truth labels of each box.
label_channels (int): Channel of label.
unmap_outputs (bool): Whether to map outputs back to the original \
set of anchors.
Returns:
tuple: Usually returns a tuple containing learning targets.
- labels_list (list[Tensor]): Labels of each level.
- label_weights_list (list[Tensor]): Label weights of \
each level
- bbox_targets_list (list[Tensor]): BBox targets of each level
- bbox_weights_list (list[Tensor]): BBox weights of each level
- num_total_pos (int): Number of positive samples in all images
- num_total_neg (int): Number of negative samples in all images
additional_returns: This function enables user-defined returns \
from self._get_targets_single`. These returns are currently \
refined to properties at each feature map (HxW dimension).
The results will be concatenated after the end
"""
num_imgs = len(img_metas)
assert len(anchor_list) == len(valid_flag_list) == num_imgs
# anchor number of multi levels
num_level_anchors = [anchors.size(0) for anchors in anchor_list[0]]
num_level_anchors_list = [num_level_anchors] * num_imgs
# concat all level anchors to a single tensor
concat_anchor_list = []
concat_valid_flag_list = []
for i in range(num_imgs):
assert len(anchor_list[i]) == len(valid_flag_list[i])
concat_anchor_list.append(torch.cat(anchor_list[i]))
concat_valid_flag_list.append(torch.cat(valid_flag_list[i]))
# compute targets for each image
if gt_bboxes_ignore_list is None:
gt_bboxes_ignore_list = [None for _ in range(num_imgs)]
if gt_labels_list is None:
gt_labels_list = [None for _ in range(num_imgs)]
results = multi_apply(
self._get_targets_single,
concat_anchor_list,
concat_valid_flag_list,
num_level_anchors_list,
gt_bboxes_list,
gt_bboxes_ignore_list,
gt_labels_list,
img_metas,
label_channels=label_channels,
unmap_outputs=unmap_outputs)
(all_labels, all_label_weights, all_bbox_targets, all_bbox_weights,
pos_inds_list, neg_inds_list, sampling_results_list) = results[:7]
rest_results = list(results[7:]) # user-added return values
# no valid anchors
if any([labels is None for labels in all_labels]):
return None
# sampled anchors of all images
num_total_pos = sum([max(inds.numel(), 1) for inds in pos_inds_list])
num_total_neg = sum([max(inds.numel(), 1) for inds in neg_inds_list])
# split targets to a list w.r.t. multiple levels
labels_list = images_to_levels(all_labels, num_level_anchors)
label_weights_list = images_to_levels(all_label_weights,
num_level_anchors)
bbox_targets_list = images_to_levels(all_bbox_targets,
num_level_anchors)
bbox_weights_list = images_to_levels(all_bbox_weights,
num_level_anchors)
res = (labels_list, label_weights_list, bbox_targets_list,
bbox_weights_list, num_total_pos, num_total_neg)
if return_sampling_results:
res = res + (sampling_results_list, )
for i, r in enumerate(rest_results): # user-added return values
rest_results[i] = images_to_levels(r, num_level_anchors)
return res + tuple(rest_results)