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import pytest
import torch
from mmdet.models.backbones import ResNeXt
from mmdet.models.backbones.resnext import Bottleneck as BottleneckX
from .utils import is_block
def test_renext_bottleneck():
with pytest.raises(AssertionError):
# Style must be in ['pytorch', 'caffe']
BottleneckX(64, 64, groups=32, base_width=4, style='tensorflow')
# Test ResNeXt Bottleneck structure
block = BottleneckX(
64, 64, groups=32, base_width=4, stride=2, style='pytorch')
assert block.conv2.stride == (2, 2)
assert block.conv2.groups == 32
assert block.conv2.out_channels == 128
# Test ResNeXt Bottleneck with DCN
dcn = dict(type='DCN', deform_groups=1, fallback_on_stride=False)
with pytest.raises(AssertionError):
# conv_cfg must be None if dcn is not None
BottleneckX(
64,
64,
groups=32,
base_width=4,
dcn=dcn,
conv_cfg=dict(type='Conv'))
BottleneckX(64, 64, dcn=dcn)
# Test ResNeXt Bottleneck forward
block = BottleneckX(64, 16, groups=32, base_width=4)
x = torch.randn(1, 64, 56, 56)
x_out = block(x)
assert x_out.shape == torch.Size([1, 64, 56, 56])
# Test ResNeXt Bottleneck forward with plugins
plugins = [
dict(
cfg=dict(
type='GeneralizedAttention',
spatial_range=-1,
num_heads=8,
attention_type='0010',
kv_stride=2),
stages=(False, False, True, True),
position='after_conv2')
]
block = BottleneckX(64, 16, groups=32, base_width=4, plugins=plugins)
x = torch.randn(1, 64, 56, 56)
x_out = block(x)
assert x_out.shape == torch.Size([1, 64, 56, 56])
def test_resnext_backbone():
with pytest.raises(KeyError):
# ResNeXt depth should be in [50, 101, 152]
ResNeXt(depth=18)
# Test ResNeXt with group 32, base_width 4
model = ResNeXt(depth=50, groups=32, base_width=4)
for m in model.modules():
if is_block(m):
assert m.conv2.groups == 32
model.init_weights()
model.train()
imgs = torch.randn(1, 3, 224, 224)
feat = model(imgs)
assert len(feat) == 4
assert feat[0].shape == torch.Size([1, 256, 56, 56])
assert feat[1].shape == torch.Size([1, 512, 28, 28])
assert feat[2].shape == torch.Size([1, 1024, 14, 14])
assert feat[3].shape == torch.Size([1, 2048, 7, 7])
regnet_test_data = [
('regnetx_400mf',
dict(w0=24, wa=24.48, wm=2.54, group_w=16, depth=22,
bot_mul=1.0), [32, 64, 160, 384]),
('regnetx_800mf',
dict(w0=56, wa=35.73, wm=2.28, group_w=16, depth=16,
bot_mul=1.0), [64, 128, 288, 672]),
('regnetx_1.6gf',
dict(w0=80, wa=34.01, wm=2.25, group_w=24, depth=18,
bot_mul=1.0), [72, 168, 408, 912]),
('regnetx_3.2gf',
dict(w0=88, wa=26.31, wm=2.25, group_w=48, depth=25,
bot_mul=1.0), [96, 192, 432, 1008]),
('regnetx_4.0gf',
dict(w0=96, wa=38.65, wm=2.43, group_w=40, depth=23,
bot_mul=1.0), [80, 240, 560, 1360]),
('regnetx_6.4gf',
dict(w0=184, wa=60.83, wm=2.07, group_w=56, depth=17,
bot_mul=1.0), [168, 392, 784, 1624]),
('regnetx_8.0gf',
dict(w0=80, wa=49.56, wm=2.88, group_w=120, depth=23,
bot_mul=1.0), [80, 240, 720, 1920]),
('regnetx_12gf',
dict(w0=168, wa=73.36, wm=2.37, group_w=112, depth=19,
bot_mul=1.0), [224, 448, 896, 2240]),
]
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