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# Copyright (c) OpenMMLab. All rights reserved.
import mmcv
import torch
from mmdet.models.dense_heads import DDODHead
def test_ddod_head_loss():
"""Tests ddod head loss when truth is empty and non-empty."""
s = 256
img_metas = [{
'img_shape': (s, s, 3),
'scale_factor': 1,
'pad_shape': (s, s, 3)
}]
train_cfg = mmcv.Config(
dict( # ATSSAssigner
assigner=dict(type='ATSSAssigner', topk=9, alpha=0.8),
reg_assigner=dict(type='ATSSAssigner', topk=9, alpha=0.5),
allowed_border=-1,
pos_weight=-1,
debug=False))
self = DDODHead(
num_classes=4,
in_channels=1,
anchor_generator=dict(
type='AnchorGenerator',
ratios=[1.0],
octave_base_scale=8,
scales_per_octave=1,
strides=[8, 16, 32, 64, 128]),
train_cfg=train_cfg,
norm_cfg=dict(type='GN', num_groups=32, requires_grad=True),
loss_iou=dict(
type='CrossEntropyLoss', use_sigmoid=True, loss_weight=1.0))
feat = [
torch.rand(1, 1, s // feat_size, s // feat_size)
for feat_size in [4, 8, 16, 32, 64]
]
cls_scores, bbox_preds, iou_preds = self.forward(feat)
# Test that empty ground truth encourages the network to predict background
gt_bboxes = [torch.empty((0, 4))]
gt_labels = [torch.LongTensor([])]
gt_bboxes_ignore = None
empty_gt_losses = self.loss(cls_scores, bbox_preds, iou_preds, gt_bboxes,
gt_labels, img_metas, gt_bboxes_ignore)
# When there is no truth, the cls loss should be nonzero but there should
# be no box loss.
empty_cls_loss = sum(empty_gt_losses['loss_cls'])
empty_box_loss = sum(empty_gt_losses['loss_bbox'])
empty_iou_loss = sum(empty_gt_losses['loss_iou'])
assert empty_cls_loss.item() > 0, 'cls loss should be non-zero'
assert empty_box_loss.item() == 0, (
'there should be no box loss when there are no true boxes')
assert empty_iou_loss.item() == 0, (
'there should be no iou loss when there are no true boxes')
# When truth is non-empty then both cls and box loss should be nonzero for
# random inputs
gt_bboxes = [
torch.Tensor([[23.6667, 23.8757, 238.6326, 151.8874]]),
]
gt_labels = [torch.LongTensor([2])]
one_gt_losses = self.loss(cls_scores, bbox_preds, iou_preds, gt_bboxes,
gt_labels, img_metas, gt_bboxes_ignore)
onegt_cls_loss = sum(one_gt_losses['loss_cls'])
onegt_box_loss = sum(one_gt_losses['loss_bbox'])
onegt_iou_loss = sum(one_gt_losses['loss_iou'])
assert onegt_cls_loss.item() > 0, 'cls loss should be non-zero'
assert onegt_box_loss.item() > 0, 'box loss should be non-zero'
assert onegt_iou_loss.item() > 0, 'iou loss should be non-zero'
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