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# Copyright (c) OpenMMLab. All rights reserved.
import mmcv
import torch
from mmdet.models.dense_heads import TOODHead
def test_tood_head_loss():
"""Tests paa 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(
initial_epoch=4,
initial_assigner=dict(type='ATSSAssigner', topk=9),
assigner=dict(type='TaskAlignedAssigner', topk=13),
alpha=1,
beta=6,
allowed_border=-1,
pos_weight=-1,
debug=False))
test_cfg = mmcv.Config(
dict(
nms_pre=1000,
min_bbox_size=0,
score_thr=0.05,
nms=dict(type='nms', iou_threshold=0.6),
max_per_img=100))
# since Focal Loss is not supported on CPU
self = TOODHead(
num_classes=80,
in_channels=1,
stacked_convs=6,
feat_channels=256,
anchor_type='anchor_free',
anchor_generator=dict(
type='AnchorGenerator',
ratios=[1.0],
octave_base_scale=8,
scales_per_octave=1,
strides=[8, 16, 32, 64, 128]),
bbox_coder=dict(
type='DeltaXYWHBBoxCoder',
target_means=[.0, .0, .0, .0],
target_stds=[0.1, 0.1, 0.2, 0.2]),
initial_loss_cls=dict(
type='FocalLoss',
use_sigmoid=True,
activated=True, # use probability instead of logit as input
gamma=2.0,
alpha=0.25,
loss_weight=1.0),
loss_cls=dict(
type='QualityFocalLoss',
use_sigmoid=True,
activated=True, # use probability instead of logit as input
beta=2.0,
loss_weight=1.0),
loss_bbox=dict(type='GIoULoss', loss_weight=2.0),
train_cfg=train_cfg,
test_cfg=test_cfg)
self.init_weights()
feat = [
torch.rand(1, 1, s // feat_size, s // feat_size)
for feat_size in [8, 16, 32, 64, 128]
]
cls_scores, bbox_preds = self(feat)
# test initial assigner and losses
self.epoch = 0
# 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, 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 = empty_gt_losses['loss_cls']
empty_box_loss = empty_gt_losses['loss_bbox']
assert sum(empty_cls_loss).item() > 0, 'cls loss should be non-zero'
assert sum(empty_box_loss).item() == 0, (
'there should be no box 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, gt_bboxes, gt_labels,
img_metas, gt_bboxes_ignore)
onegt_cls_loss = one_gt_losses['loss_cls']
onegt_box_loss = one_gt_losses['loss_bbox']
assert sum(onegt_cls_loss).item() > 0, 'cls loss should be non-zero'
assert sum(onegt_box_loss).item() > 0, 'box loss should be non-zero'
# test task alignment assigner and losses
self.epoch = 10
# 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, 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 = empty_gt_losses['loss_cls']
empty_box_loss = empty_gt_losses['loss_bbox']
assert sum(empty_cls_loss).item() > 0, 'cls loss should be non-zero'
assert sum(empty_box_loss).item() == 0, (
'there should be no box 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, gt_bboxes, gt_labels,
img_metas, gt_bboxes_ignore)
onegt_cls_loss = one_gt_losses['loss_cls']
onegt_box_loss = one_gt_losses['loss_bbox']
assert sum(onegt_cls_loss).item() > 0, 'cls loss should be non-zero'
assert sum(onegt_box_loss).item() > 0, 'box loss should be non-zero'
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