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pytorch-image-models/timm/models/cspnet.py

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"""PyTorch CspNet
A PyTorch implementation of Cross Stage Partial Networks including:
* CSPResNet50
* CSPResNeXt50
* CSPDarkNet53
* and DarkNet53 for good measure
Based on paper `CSPNet: A New Backbone that can Enhance Learning Capability of CNN` - https://arxiv.org/abs/1911.11929
Reference impl via darknet cfg files at https://github.com/WongKinYiu/CrossStagePartialNetworks
Hacked together by / Copyright 2020 Ross Wightman
"""
import collections.abc
from dataclasses import dataclass, field, asdict
from functools import partial
from typing import Any, Callable, Dict, Optional, Tuple, Union
import torch
import torch.nn as nn
import torch.nn.functional as F
from timm.data import IMAGENET_DEFAULT_MEAN, IMAGENET_DEFAULT_STD
from .helpers import build_model_with_cfg, named_apply, MATCH_PREV_GROUP
from .layers import ClassifierHead, ConvNormAct, ConvNormActAa, DropPath, get_attn, create_act_layer, make_divisible
from .registry import register_model
__all__ = ['CspNet'] # model_registry will add each entrypoint fn to this
def _cfg(url='', **kwargs):
return {
'url': url,
'num_classes': 1000, 'input_size': (3, 256, 256), 'pool_size': (8, 8),
'crop_pct': 0.887, 'interpolation': 'bilinear',
'mean': IMAGENET_DEFAULT_MEAN, 'std': IMAGENET_DEFAULT_STD,
'first_conv': 'stem.conv1.conv', 'classifier': 'head.fc',
**kwargs
}
default_cfgs = {
'cspresnet50': _cfg(
url='https://github.com/rwightman/pytorch-image-models/releases/download/v0.1-weights/cspresnet50_ra-d3e8d487.pth'),
'cspresnet50d': _cfg(url=''),
'cspresnet50w': _cfg(url=''),
'cspresnext50': _cfg(
url='https://github.com/rwightman/pytorch-image-models/releases/download/v0.1-weights/cspresnext50_ra_224-648b4713.pth',
),
'cspdarknet53': _cfg(
url='https://github.com/rwightman/pytorch-image-models/releases/download/v0.1-weights/cspdarknet53_ra_256-d05c7c21.pth'),
'darknet17': _cfg(url=''),
'darknet21': _cfg(url=''),
'sedarknet21': _cfg(url=''),
'darknet53': _cfg(
url='https://github.com/rwightman/pytorch-image-models/releases/download/v0.1-tpu-weights/darknet53_256_c2ns-3aeff817.pth',
interpolation='bicubic', test_input_size=(3, 288, 288), test_crop_pct=1.0),
'darknetaa53': _cfg(
url='https://github.com/rwightman/pytorch-image-models/releases/download/v0.1-tpu-weights/darknetaa53_c2ns-5c28ec8a.pth',
test_input_size=(3, 288, 288), test_crop_pct=1.0),
'cs3darknet_s': _cfg(
url='', interpolation='bicubic'),
'cs3darknet_m': _cfg(
url='https://github.com/rwightman/pytorch-image-models/releases/download/v0.1-tpu-weights/cs3darknet_m_c2ns-43f06604.pth',
interpolation='bicubic', test_input_size=(3, 288, 288), test_crop_pct=0.95,
),
'cs3darknet_l': _cfg(
url='https://github.com/rwightman/pytorch-image-models/releases/download/v0.1-tpu-weights/cs3darknet_l_c2ns-16220c5d.pth',
interpolation='bicubic', test_input_size=(3, 288, 288), test_crop_pct=0.95),
'cs3darknet_x': _cfg(
url='https://github.com/rwightman/pytorch-image-models/releases/download/v0.1-tpu-weights/cs3darknet_x_c2ns-4e4490aa.pth',
interpolation='bicubic', crop_pct=0.95, test_input_size=(3, 288, 288), test_crop_pct=1.0),
'cs3darknet_focus_s': _cfg(
url='', interpolation='bicubic'),
'cs3darknet_focus_m': _cfg(
url='https://github.com/rwightman/pytorch-image-models/releases/download/v0.1-tpu-weights/cs3darknet_focus_m_c2ns-e23bed41.pth',
interpolation='bicubic', test_input_size=(3, 288, 288), test_crop_pct=0.95),
'cs3darknet_focus_l': _cfg(
url='https://github.com/rwightman/pytorch-image-models/releases/download/v0.1-tpu-weights/cs3darknet_focus_l_c2ns-65ef8888.pth',
interpolation='bicubic', test_input_size=(3, 288, 288), test_crop_pct=0.95),
'cs3darknet_focus_x': _cfg(
url='', interpolation='bicubic'),
'cs3sedarknet_l': _cfg(
url='https://github.com/rwightman/pytorch-image-models/releases/download/v0.1-tpu-weights/cs3sedarknet_l_c2ns-e8d1dc13.pth',
interpolation='bicubic', test_input_size=(3, 288, 288), test_crop_pct=0.95),
'cs3sedarknet_x': _cfg(
url='https://github.com/rwightman/pytorch-image-models/releases/download/v0.1-tpu-weights/cs3sedarknet_x_c2ns-b4d0abc0.pth',
interpolation='bicubic', test_input_size=(3, 288, 288), test_crop_pct=1.0),
'cs3sedarknet_xdw': _cfg(
url='', interpolation='bicubic'),
'cs3edgenet_x': _cfg(
url='', interpolation='bicubic'),
'cs3se_edgenet_x': _cfg(
url='', interpolation='bicubic'),
}
@dataclass
class CspStemCfg:
out_chs: Union[int, Tuple[int, ...]] = 32
stride: Union[int, Tuple[int, ...]] = 2
kernel_size: int = 3
padding: Union[int, str] = ''
pool: Optional[str] = ''
def _pad_arg(x, n):
# pads an argument tuple to specified n by padding with last value
if not isinstance(x, (tuple, list)):
x = (x,)
curr_n = len(x)
pad_n = n - curr_n
if pad_n <= 0:
return x[:n]
return tuple(x + (x[-1],) * pad_n)
@dataclass
class CspStagesCfg:
depth: Tuple[int, ...] = (3, 3, 5, 2) # block depth (number of block repeats in stages)
out_chs: Tuple[int, ...] = (128, 256, 512, 1024) # number of output channels for blocks in stage
stride: Union[int, Tuple[int, ...]] = 2 # stride of stage
groups: Union[int, Tuple[int, ...]] = 1 # num kxk conv groups
block_ratio: Union[float, Tuple[float, ...]] = 1.0
bottle_ratio: Union[float, Tuple[float, ...]] = 1. # bottleneck-ratio of blocks in stage
avg_down: Union[bool, Tuple[bool, ...]] = False
attn_layer: Optional[Union[str, Tuple[str, ...]]] = None
attn_kwargs: Optional[Union[Dict, Tuple[Dict]]] = None
stage_type: Union[str, Tuple[str]] = 'csp' # stage type ('csp', 'cs2', 'dark')
block_type: Union[str, Tuple[str]] = 'bottle' # blocks type for stages ('bottle', 'dark')
# cross-stage only
expand_ratio: Union[float, Tuple[float, ...]] = 1.0
cross_linear: Union[bool, Tuple[bool, ...]] = False
down_growth: Union[bool, Tuple[bool, ...]] = False
def __post_init__(self):
n = len(self.depth)
assert len(self.out_chs) == n
self.stride = _pad_arg(self.stride, n)
self.groups = _pad_arg(self.groups, n)
self.block_ratio = _pad_arg(self.block_ratio, n)
self.bottle_ratio = _pad_arg(self.bottle_ratio, n)
self.avg_down = _pad_arg(self.avg_down, n)
self.attn_layer = _pad_arg(self.attn_layer, n)
self.attn_kwargs = _pad_arg(self.attn_kwargs, n)
self.stage_type = _pad_arg(self.stage_type, n)
self.block_type = _pad_arg(self.block_type, n)
self.expand_ratio = _pad_arg(self.expand_ratio, n)
self.cross_linear = _pad_arg(self.cross_linear, n)
self.down_growth = _pad_arg(self.down_growth, n)
@dataclass
class CspModelCfg:
stem: CspStemCfg
stages: CspStagesCfg
zero_init_last: bool = True # zero init last weight (usually bn) in residual path
act_layer: str = 'leaky_relu'
norm_layer: str = 'batchnorm'
aa_layer: Optional[str] = None # FIXME support string factory for this
def _cs3_cfg(
width_multiplier=1.0,
depth_multiplier=1.0,
avg_down=False,
act_layer='silu',
focus=False,
attn_layer=None,
attn_kwargs=None,
bottle_ratio=1.0,
block_type='dark',
):
if focus:
stem_cfg = CspStemCfg(
out_chs=make_divisible(64 * width_multiplier),
kernel_size=6, stride=2, padding=2, pool='')
else:
stem_cfg = CspStemCfg(
out_chs=tuple([make_divisible(c * width_multiplier) for c in (32, 64)]),
kernel_size=3, stride=2, pool='')
return CspModelCfg(
stem=stem_cfg,
stages=CspStagesCfg(
out_chs=tuple([make_divisible(c * width_multiplier) for c in (128, 256, 512, 1024)]),
depth=tuple([int(d * depth_multiplier) for d in (3, 6, 9, 3)]),
stride=2,
bottle_ratio=bottle_ratio,
block_ratio=0.5,
avg_down=avg_down,
attn_layer=attn_layer,
attn_kwargs=attn_kwargs,
stage_type='cs3',
block_type=block_type,
),
act_layer=act_layer,
)
model_cfgs = dict(
cspresnet50=CspModelCfg(
stem=CspStemCfg(out_chs=64, kernel_size=7, stride=4, pool='max'),
stages=CspStagesCfg(
depth=(3, 3, 5, 2),
out_chs=(128, 256, 512, 1024),
stride=(1, 2),
expand_ratio=2.,
bottle_ratio=0.5,
cross_linear=True,
),
),
cspresnet50d=CspModelCfg(
stem=CspStemCfg(out_chs=(32, 32, 64), kernel_size=3, stride=4, pool='max'),
stages=CspStagesCfg(
depth=(3, 3, 5, 2),
out_chs=(128, 256, 512, 1024),
stride=(1,) + (2,),
expand_ratio=2.,
bottle_ratio=0.5,
block_ratio=1.,
cross_linear=True,
),
),
cspresnet50w=CspModelCfg(
stem=CspStemCfg(out_chs=(32, 32, 64), kernel_size=3, stride=4, pool='max'),
stages=CspStagesCfg(
depth=(3, 3, 5, 2),
out_chs=(256, 512, 1024, 2048),
stride=(1,) + (2,),
expand_ratio=1.,
bottle_ratio=0.25,
block_ratio=0.5,
cross_linear=True,
),
),
cspresnext50=CspModelCfg(
stem=CspStemCfg(out_chs=64, kernel_size=7, stride=4, pool='max'),
stages=CspStagesCfg(
depth=(3, 3, 5, 2),
out_chs=(256, 512, 1024, 2048),
stride=(1,) + (2,),
groups=32,
expand_ratio=1.,
bottle_ratio=1.,
block_ratio=0.5,
cross_linear=True,
),
),
cspdarknet53=CspModelCfg(
stem=CspStemCfg(out_chs=32, kernel_size=3, stride=1, pool=''),
stages=CspStagesCfg(
depth=(1, 2, 8, 8, 4),
out_chs=(64, 128, 256, 512, 1024),
stride=2,
expand_ratio=(2.,) + (1.,),
bottle_ratio=(0.5,) + (1.,),
block_ratio=(1.,) + (0.5,),
down_growth=True,
block_type='dark',
),
),
darknet17=CspModelCfg(
stem=CspStemCfg(out_chs=32, kernel_size=3, stride=1, pool=''),
stages=CspStagesCfg(
depth=(1,) * 5,
out_chs=(64, 128, 256, 512, 1024),
stride=(2,),
bottle_ratio=(0.5,),
block_ratio=(1.,),
stage_type='dark',
block_type='dark',
),
),
darknet21=CspModelCfg(
stem=CspStemCfg(out_chs=32, kernel_size=3, stride=1, pool=''),
stages=CspStagesCfg(
depth=(1, 1, 1, 2, 2),
out_chs=(64, 128, 256, 512, 1024),
stride=(2,),
bottle_ratio=(0.5,),
block_ratio=(1.,),
stage_type='dark',
block_type='dark',
),
),
sedarknet21=CspModelCfg(
stem=CspStemCfg(out_chs=32, kernel_size=3, stride=1, pool=''),
stages=CspStagesCfg(
depth=(1, 1, 1, 2, 2),
out_chs=(64, 128, 256, 512, 1024),
stride=2,
bottle_ratio=0.5,
block_ratio=1.,
attn_layer='se',
stage_type='dark',
block_type='dark',
),
),
darknet53=CspModelCfg(
stem=CspStemCfg(out_chs=32, kernel_size=3, stride=1, pool=''),
stages=CspStagesCfg(
depth=(1, 2, 8, 8, 4),
out_chs=(64, 128, 256, 512, 1024),
stride=2,
bottle_ratio=0.5,
block_ratio=1.,
stage_type='dark',
block_type='dark',
),
),
darknetaa53=CspModelCfg(
stem=CspStemCfg(out_chs=32, kernel_size=3, stride=1, pool=''),
stages=CspStagesCfg(
depth=(1, 2, 8, 8, 4),
out_chs=(64, 128, 256, 512, 1024),
stride=2,
bottle_ratio=0.5,
block_ratio=1.,
avg_down=True,
stage_type='dark',
block_type='dark',
),
),
cs3darknet_s=_cs3_cfg(width_multiplier=0.5, depth_multiplier=0.5),
cs3darknet_m=_cs3_cfg(width_multiplier=0.75, depth_multiplier=0.67),
cs3darknet_l=_cs3_cfg(),
cs3darknet_x=_cs3_cfg(width_multiplier=1.25, depth_multiplier=1.33),
cs3darknet_focus_s=_cs3_cfg(width_multiplier=0.5, depth_multiplier=0.5, focus=True),
cs3darknet_focus_m=_cs3_cfg(width_multiplier=0.75, depth_multiplier=0.67, focus=True),
cs3darknet_focus_l=_cs3_cfg(focus=True),
cs3darknet_focus_x=_cs3_cfg(width_multiplier=1.25, depth_multiplier=1.33, focus=True),
cs3sedarknet_l=_cs3_cfg(attn_layer='se', attn_kwargs=dict(rd_ratio=.25)),
cs3sedarknet_x=_cs3_cfg(attn_layer='se', width_multiplier=1.25, depth_multiplier=1.33),
cs3sedarknet_xdw=CspModelCfg(
stem=CspStemCfg(out_chs=(32, 64), kernel_size=3, stride=2, pool=''),
stages=CspStagesCfg(
depth=(3, 6, 12, 4),
out_chs=(256, 512, 1024, 2048),
stride=2,
groups=(1, 1, 256, 512),
bottle_ratio=0.5,
block_ratio=0.5,
attn_layer='se',
),
act_layer='silu',
),
cs3edgenet_x=_cs3_cfg(width_multiplier=1.25, depth_multiplier=1.33, bottle_ratio=1.5, block_type='edge'),
cs3se_edgenet_x=_cs3_cfg(
width_multiplier=1.25, depth_multiplier=1.33, bottle_ratio=1.5, block_type='edge',
attn_layer='se', attn_kwargs=dict(rd_ratio=.25)),
)
class BottleneckBlock(nn.Module):
""" ResNe(X)t Bottleneck Block
"""
def __init__(
self,
in_chs,
out_chs,
dilation=1,
bottle_ratio=0.25,
groups=1,
act_layer=nn.ReLU,
norm_layer=nn.BatchNorm2d,
attn_last=False,
attn_layer=None,
drop_block=None,
drop_path=0.
):
super(BottleneckBlock, self).__init__()
mid_chs = int(round(out_chs * bottle_ratio))
ckwargs = dict(act_layer=act_layer, norm_layer=norm_layer)
attn_last = attn_layer is not None and attn_last
attn_first = attn_layer is not None and not attn_last
self.conv1 = ConvNormAct(in_chs, mid_chs, kernel_size=1, **ckwargs)
self.conv2 = ConvNormAct(
mid_chs, mid_chs, kernel_size=3, dilation=dilation, groups=groups,
drop_layer=drop_block, **ckwargs)
self.attn2 = attn_layer(mid_chs, act_layer=act_layer) if attn_first else nn.Identity()
self.conv3 = ConvNormAct(mid_chs, out_chs, kernel_size=1, apply_act=False, **ckwargs)
self.attn3 = attn_layer(out_chs, act_layer=act_layer) if attn_last else nn.Identity()
self.drop_path = DropPath(drop_path) if drop_path else nn.Identity()
self.act3 = create_act_layer(act_layer)
def zero_init_last(self):
nn.init.zeros_(self.conv3.bn.weight)
def forward(self, x):
shortcut = x
x = self.conv1(x)
x = self.conv2(x)
x = self.attn2(x)
x = self.conv3(x)
x = self.attn3(x)
x = self.drop_path(x) + shortcut
# FIXME partial shortcut needed if first block handled as per original, not used for my current impl
#x[:, :shortcut.size(1)] += shortcut
x = self.act3(x)
return x
class DarkBlock(nn.Module):
""" DarkNet Block
"""
def __init__(
self,
in_chs,
out_chs,
dilation=1,
bottle_ratio=0.5,
groups=1,
act_layer=nn.ReLU,
norm_layer=nn.BatchNorm2d,
attn_layer=None,
drop_block=None,
drop_path=0.
):
super(DarkBlock, self).__init__()
mid_chs = int(round(out_chs * bottle_ratio))
ckwargs = dict(act_layer=act_layer, norm_layer=norm_layer)
self.conv1 = ConvNormAct(in_chs, mid_chs, kernel_size=1, **ckwargs)
self.attn = attn_layer(mid_chs, act_layer=act_layer) if attn_layer is not None else nn.Identity()
self.conv2 = ConvNormAct(
mid_chs, out_chs, kernel_size=3, dilation=dilation, groups=groups,
drop_layer=drop_block, **ckwargs)
self.drop_path = DropPath(drop_path) if drop_path else nn.Identity()
def zero_init_last(self):
nn.init.zeros_(self.conv2.bn.weight)
def forward(self, x):
shortcut = x
x = self.conv1(x)
x = self.attn(x)
x = self.conv2(x)
x = self.drop_path(x) + shortcut
return x
class EdgeBlock(nn.Module):
""" EdgeResidual / Fused-MBConv / MobileNetV1-like 3x3 + 1x1 block (w/ activated output)
"""
def __init__(
self,
in_chs,
out_chs,
dilation=1,
bottle_ratio=0.5,
groups=1,
act_layer=nn.ReLU,
norm_layer=nn.BatchNorm2d,
attn_layer=None,
drop_block=None,
drop_path=0.
):
super(EdgeBlock, self).__init__()
mid_chs = int(round(out_chs * bottle_ratio))
ckwargs = dict(act_layer=act_layer, norm_layer=norm_layer)
self.conv1 = ConvNormAct(
in_chs, mid_chs, kernel_size=3, dilation=dilation, groups=groups,
drop_layer=drop_block, **ckwargs)
self.attn = attn_layer(mid_chs, act_layer=act_layer) if attn_layer is not None else nn.Identity()
self.conv2 = ConvNormAct(mid_chs, out_chs, kernel_size=1, **ckwargs)
self.drop_path = DropPath(drop_path) if drop_path else nn.Identity()
def zero_init_last(self):
nn.init.zeros_(self.conv2.bn.weight)
def forward(self, x):
shortcut = x
x = self.conv1(x)
x = self.attn(x)
x = self.conv2(x)
x = self.drop_path(x) + shortcut
return x
class CrossStage(nn.Module):
"""Cross Stage."""
def __init__(
self,
in_chs,
out_chs,
stride,
dilation,
depth,
block_ratio=1.,
bottle_ratio=1.,
expand_ratio=1.,
groups=1,
first_dilation=None,
avg_down=False,
down_growth=False,
cross_linear=False,
block_dpr=None,
block_fn=BottleneckBlock,
**block_kwargs
):
super(CrossStage, self).__init__()
first_dilation = first_dilation or dilation
down_chs = out_chs if down_growth else in_chs # grow downsample channels to output channels
self.expand_chs = exp_chs = int(round(out_chs * expand_ratio))
block_out_chs = int(round(out_chs * block_ratio))
conv_kwargs = dict(act_layer=block_kwargs.get('act_layer'), norm_layer=block_kwargs.get('norm_layer'))
aa_layer = block_kwargs.pop('aa_layer', None)
if stride != 1 or first_dilation != dilation:
if avg_down:
self.conv_down = nn.Sequential(
nn.AvgPool2d(2) if stride == 2 else nn.Identity(), # FIXME dilation handling
ConvNormActAa(in_chs, out_chs, kernel_size=1, stride=1, groups=groups, **conv_kwargs)
)
else:
self.conv_down = ConvNormActAa(
in_chs, down_chs, kernel_size=3, stride=stride, dilation=first_dilation, groups=groups,
aa_layer=aa_layer, **conv_kwargs)
prev_chs = down_chs
else:
self.conv_down = nn.Identity()
prev_chs = in_chs
# FIXME this 1x1 expansion is pushed down into the cross and block paths in the darknet cfgs. Also,
# there is also special case for the first stage for some of the model that results in uneven split
# across the two paths. I did it this way for simplicity for now.
self.conv_exp = ConvNormAct(prev_chs, exp_chs, kernel_size=1, apply_act=not cross_linear, **conv_kwargs)
prev_chs = exp_chs // 2 # output of conv_exp is always split in two
self.blocks = nn.Sequential()
for i in range(depth):
self.blocks.add_module(str(i), block_fn(
in_chs=prev_chs,
out_chs=block_out_chs,
dilation=dilation,
bottle_ratio=bottle_ratio,
groups=groups,
drop_path=block_dpr[i] if block_dpr is not None else 0.,
**block_kwargs
))
prev_chs = block_out_chs
# transition convs
self.conv_transition_b = ConvNormAct(prev_chs, exp_chs // 2, kernel_size=1, **conv_kwargs)
self.conv_transition = ConvNormAct(exp_chs, out_chs, kernel_size=1, **conv_kwargs)
def forward(self, x):
x = self.conv_down(x)
x = self.conv_exp(x)
xs, xb = x.split(self.expand_chs // 2, dim=1)
xb = self.blocks(xb)
xb = self.conv_transition_b(xb).contiguous()
out = self.conv_transition(torch.cat([xs, xb], dim=1))
return out
class CrossStage3(nn.Module):
"""Cross Stage 3.
Similar to CrossStage, but with only one transition conv for the output.
"""
def __init__(
self,
in_chs,
out_chs,
stride,
dilation,
depth,
block_ratio=1.,
bottle_ratio=1.,
expand_ratio=1.,
groups=1,
first_dilation=None,
avg_down=False,
down_growth=False,
cross_linear=False,
block_dpr=None,
block_fn=BottleneckBlock,
**block_kwargs
):
super(CrossStage3, self).__init__()
first_dilation = first_dilation or dilation
down_chs = out_chs if down_growth else in_chs # grow downsample channels to output channels
self.expand_chs = exp_chs = int(round(out_chs * expand_ratio))
block_out_chs = int(round(out_chs * block_ratio))
conv_kwargs = dict(act_layer=block_kwargs.get('act_layer'), norm_layer=block_kwargs.get('norm_layer'))
aa_layer = block_kwargs.pop('aa_layer', None)
if stride != 1 or first_dilation != dilation:
if avg_down:
self.conv_down = nn.Sequential(
nn.AvgPool2d(2) if stride == 2 else nn.Identity(), # FIXME dilation handling
ConvNormActAa(in_chs, out_chs, kernel_size=1, stride=1, groups=groups, **conv_kwargs)
)
else:
self.conv_down = ConvNormActAa(
in_chs, down_chs, kernel_size=3, stride=stride, dilation=first_dilation, groups=groups,
aa_layer=aa_layer, **conv_kwargs)
prev_chs = down_chs
else:
self.conv_down = None
prev_chs = in_chs
# expansion conv
self.conv_exp = ConvNormAct(prev_chs, exp_chs, kernel_size=1, apply_act=not cross_linear, **conv_kwargs)
prev_chs = exp_chs // 2 # expanded output is split in 2 for blocks and cross stage
self.blocks = nn.Sequential()
for i in range(depth):
self.blocks.add_module(str(i), block_fn(
in_chs=prev_chs,
out_chs=block_out_chs,
dilation=dilation,
bottle_ratio=bottle_ratio,
groups=groups,
drop_path=block_dpr[i] if block_dpr is not None else 0.,
**block_kwargs
))
prev_chs = block_out_chs
# transition convs
self.conv_transition = ConvNormAct(exp_chs, out_chs, kernel_size=1, **conv_kwargs)
def forward(self, x):
x = self.conv_down(x)
x = self.conv_exp(x)
x1, x2 = x.split(self.expand_chs // 2, dim=1)
x1 = self.blocks(x1)
out = self.conv_transition(torch.cat([x1, x2], dim=1))
return out
class DarkStage(nn.Module):
"""DarkNet stage."""
def __init__(
self,
in_chs,
out_chs,
stride,
dilation,
depth,
block_ratio=1.,
bottle_ratio=1.,
groups=1,
first_dilation=None,
avg_down=False,
block_fn=BottleneckBlock,
block_dpr=None,
**block_kwargs
):
super(DarkStage, self).__init__()
first_dilation = first_dilation or dilation
conv_kwargs = dict(act_layer=block_kwargs.get('act_layer'), norm_layer=block_kwargs.get('norm_layer'))
aa_layer = block_kwargs.pop('aa_layer', None)
if avg_down:
self.conv_down = nn.Sequential(
nn.AvgPool2d(2) if stride == 2 else nn.Identity(), # FIXME dilation handling
ConvNormActAa(in_chs, out_chs, kernel_size=1, stride=1, groups=groups, **conv_kwargs)
)
else:
self.conv_down = ConvNormActAa(
in_chs, out_chs, kernel_size=3, stride=stride, dilation=first_dilation, groups=groups,
aa_layer=aa_layer, **conv_kwargs)
prev_chs = out_chs
block_out_chs = int(round(out_chs * block_ratio))
self.blocks = nn.Sequential()
for i in range(depth):
self.blocks.add_module(str(i), block_fn(
in_chs=prev_chs,
out_chs=block_out_chs,
dilation=dilation,
bottle_ratio=bottle_ratio,
groups=groups,
drop_path=block_dpr[i] if block_dpr is not None else 0.,
**block_kwargs
))
prev_chs = block_out_chs
def forward(self, x):
x = self.conv_down(x)
x = self.blocks(x)
return x
def create_csp_stem(
in_chans=3,
out_chs=32,
kernel_size=3,
stride=2,
pool='',
padding='',
act_layer=nn.ReLU,
norm_layer=nn.BatchNorm2d,
aa_layer=None
):
stem = nn.Sequential()
feature_info = []
if not isinstance(out_chs, (tuple, list)):
out_chs = [out_chs]
stem_depth = len(out_chs)
assert stem_depth
assert stride in (1, 2, 4)
prev_feat = None
prev_chs = in_chans
last_idx = stem_depth - 1
stem_stride = 1
for i, chs in enumerate(out_chs):
conv_name = f'conv{i + 1}'
conv_stride = 2 if (i == 0 and stride > 1) or (i == last_idx and stride > 2 and not pool) else 1
if conv_stride > 1 and prev_feat is not None:
feature_info.append(prev_feat)
stem.add_module(conv_name, ConvNormAct(
prev_chs, chs, kernel_size,
stride=conv_stride,
padding=padding if i == 0 else '',
act_layer=act_layer,
norm_layer=norm_layer
))
stem_stride *= conv_stride
prev_chs = chs
prev_feat = dict(num_chs=prev_chs, reduction=stem_stride, module='.'.join(['stem', conv_name]))
if pool:
assert stride > 2
if prev_feat is not None:
feature_info.append(prev_feat)
if aa_layer is not None:
stem.add_module('pool', nn.MaxPool2d(kernel_size=3, stride=1, padding=1))
stem.add_module('aa', aa_layer(channels=prev_chs, stride=2))
pool_name = 'aa'
else:
stem.add_module('pool', nn.MaxPool2d(kernel_size=3, stride=2, padding=1))
pool_name = 'pool'
stem_stride *= 2
prev_feat = dict(num_chs=prev_chs, reduction=stem_stride, module='.'.join(['stem', pool_name]))
feature_info.append(prev_feat)
return stem, feature_info
def _get_stage_fn(stage_args):
stage_type = stage_args.pop('stage_type')
assert stage_type in ('dark', 'csp', 'cs3')
if stage_type == 'dark':
stage_args.pop('expand_ratio', None)
stage_args.pop('cross_linear', None)
stage_args.pop('down_growth', None)
stage_fn = DarkStage
elif stage_type == 'csp':
stage_fn = CrossStage
else:
stage_fn = CrossStage3
return stage_fn, stage_args
def _get_block_fn(stage_args):
block_type = stage_args.pop('block_type')
assert block_type in ('dark', 'edge', 'bottle')
if block_type == 'dark':
return DarkBlock, stage_args
elif block_type == 'edge':
return EdgeBlock, stage_args
else:
return BottleneckBlock, stage_args
def _get_attn_fn(stage_args):
attn_layer = stage_args.pop('attn_layer')
attn_kwargs = stage_args.pop('attn_kwargs', None) or {}
if attn_layer is not None:
attn_layer = get_attn(attn_layer)
if attn_kwargs:
attn_layer = partial(attn_layer, **attn_kwargs)
return attn_layer, stage_args
def create_csp_stages(
cfg: CspModelCfg,
drop_path_rate: float,
output_stride: int,
stem_feat: Dict[str, Any]
):
cfg_dict = asdict(cfg.stages)
num_stages = len(cfg.stages.depth)
cfg_dict['block_dpr'] = [None] * num_stages if not drop_path_rate else \
[x.tolist() for x in torch.linspace(0, drop_path_rate, sum(cfg.stages.depth)).split(cfg.stages.depth)]
stage_args = [dict(zip(cfg_dict.keys(), values)) for values in zip(*cfg_dict.values())]
block_kwargs = dict(
act_layer=cfg.act_layer,
norm_layer=cfg.norm_layer,
)
dilation = 1
net_stride = stem_feat['reduction']
prev_chs = stem_feat['num_chs']
prev_feat = stem_feat
feature_info = []
stages = []
for stage_idx, stage_args in enumerate(stage_args):
stage_fn, stage_args = _get_stage_fn(stage_args)
block_fn, stage_args = _get_block_fn(stage_args)
attn_fn, stage_args = _get_attn_fn(stage_args)
stride = stage_args.pop('stride')
if stride != 1 and prev_feat:
feature_info.append(prev_feat)
if net_stride >= output_stride and stride > 1:
dilation *= stride
stride = 1
net_stride *= stride
first_dilation = 1 if dilation in (1, 2) else 2
stages += [stage_fn(
prev_chs,
**stage_args,
stride=stride,
first_dilation=first_dilation,
dilation=dilation,
block_fn=block_fn,
aa_layer=cfg.aa_layer,
attn_layer=attn_fn, # will be passed through stage as block_kwargs
**block_kwargs,
)]
prev_chs = stage_args['out_chs']
prev_feat = dict(num_chs=prev_chs, reduction=net_stride, module=f'stages.{stage_idx}')
feature_info.append(prev_feat)
return nn.Sequential(*stages), feature_info
class CspNet(nn.Module):
"""Cross Stage Partial base model.
Paper: `CSPNet: A New Backbone that can Enhance Learning Capability of CNN` - https://arxiv.org/abs/1911.11929
Ref Impl: https://github.com/WongKinYiu/CrossStagePartialNetworks
NOTE: There are differences in the way I handle the 1x1 'expansion' conv in this impl vs the
darknet impl. I did it this way for simplicity and less special cases.
"""
def __init__(
self,
cfg: CspModelCfg,
in_chans=3,
num_classes=1000,
output_stride=32,
global_pool='avg',
drop_rate=0.,
drop_path_rate=0.,
zero_init_last=True
):
super().__init__()
self.num_classes = num_classes
self.drop_rate = drop_rate
assert output_stride in (8, 16, 32)
layer_args = dict(
act_layer=cfg.act_layer,
norm_layer=cfg.norm_layer,
aa_layer=cfg.aa_layer
)
self.feature_info = []
# Construct the stem
self.stem, stem_feat_info = create_csp_stem(in_chans, **asdict(cfg.stem), **layer_args)
self.feature_info.extend(stem_feat_info[:-1])
# Construct the stages
self.stages, stage_feat_info = create_csp_stages(
cfg,
drop_path_rate=drop_path_rate,
output_stride=output_stride,
stem_feat=stem_feat_info[-1],
)
prev_chs = stage_feat_info[-1]['num_chs']
self.feature_info.extend(stage_feat_info)
# Construct the head
self.num_features = prev_chs
self.head = ClassifierHead(
in_chs=prev_chs, num_classes=num_classes, pool_type=global_pool, drop_rate=drop_rate)
named_apply(partial(_init_weights, zero_init_last=zero_init_last), self)
@torch.jit.ignore
def group_matcher(self, coarse=False):
matcher = dict(
stem=r'^stem',
blocks=r'^stages\.(\d+)' if coarse else [
(r'^stages\.(\d+)\.blocks\.(\d+)', None),
(r'^stages\.(\d+)\..*transition', MATCH_PREV_GROUP), # map to last block in stage
(r'^stages\.(\d+)', (0,)),
]
)
return matcher
@torch.jit.ignore
def set_grad_checkpointing(self, enable=True):
assert not enable, 'gradient checkpointing not supported'
@torch.jit.ignore
def get_classifier(self):
return self.head.fc
def reset_classifier(self, num_classes, global_pool='avg'):
self.head = ClassifierHead(self.num_features, num_classes, pool_type=global_pool, drop_rate=self.drop_rate)
def forward_features(self, x):
x = self.stem(x)
x = self.stages(x)
return x
def forward_head(self, x, pre_logits: bool = False):
return self.head(x, pre_logits=pre_logits)
def forward(self, x):
x = self.forward_features(x)
x = self.forward_head(x)
return x
def _init_weights(module, name, zero_init_last=False):
if isinstance(module, nn.Conv2d):
nn.init.kaiming_normal_(module.weight, mode='fan_out', nonlinearity='relu')
if module.bias is not None:
nn.init.zeros_(module.bias)
elif isinstance(module, nn.Linear):
nn.init.normal_(module.weight, mean=0.0, std=0.01)
if module.bias is not None:
nn.init.zeros_(module.bias)
elif zero_init_last and hasattr(module, 'zero_init_last'):
module.zero_init_last()
def _create_cspnet(variant, pretrained=False, **kwargs):
if variant.startswith('darknet') or variant.startswith('cspdarknet'):
# NOTE: DarkNet is one of few models with stride==1 features w/ 6 out_indices [0..5]
default_out_indices = (0, 1, 2, 3, 4, 5)
else:
default_out_indices = (0, 1, 2, 3, 4)
out_indices = kwargs.pop('out_indices', default_out_indices)
return build_model_with_cfg(
CspNet, variant, pretrained,
model_cfg=model_cfgs[variant],
feature_cfg=dict(flatten_sequential=True, out_indices=out_indices),
**kwargs)
@register_model
def cspresnet50(pretrained=False, **kwargs):
return _create_cspnet('cspresnet50', pretrained=pretrained, **kwargs)
@register_model
def cspresnet50d(pretrained=False, **kwargs):
return _create_cspnet('cspresnet50d', pretrained=pretrained, **kwargs)
@register_model
def cspresnet50w(pretrained=False, **kwargs):
return _create_cspnet('cspresnet50w', pretrained=pretrained, **kwargs)
@register_model
def cspresnext50(pretrained=False, **kwargs):
return _create_cspnet('cspresnext50', pretrained=pretrained, **kwargs)
@register_model
def cspdarknet53(pretrained=False, **kwargs):
return _create_cspnet('cspdarknet53', pretrained=pretrained, **kwargs)
@register_model
def darknet17(pretrained=False, **kwargs):
return _create_cspnet('darknet17', pretrained=pretrained, **kwargs)
@register_model
def darknet21(pretrained=False, **kwargs):
return _create_cspnet('darknet21', pretrained=pretrained, **kwargs)
@register_model
def sedarknet21(pretrained=False, **kwargs):
return _create_cspnet('sedarknet21', pretrained=pretrained, **kwargs)
@register_model
def darknet53(pretrained=False, **kwargs):
return _create_cspnet('darknet53', pretrained=pretrained, **kwargs)
@register_model
def darknetaa53(pretrained=False, **kwargs):
return _create_cspnet('darknetaa53', pretrained=pretrained, **kwargs)
@register_model
def cs3darknet_s(pretrained=False, **kwargs):
return _create_cspnet('cs3darknet_s', pretrained=pretrained, **kwargs)
@register_model
def cs3darknet_m(pretrained=False, **kwargs):
return _create_cspnet('cs3darknet_m', pretrained=pretrained, **kwargs)
@register_model
def cs3darknet_l(pretrained=False, **kwargs):
return _create_cspnet('cs3darknet_l', pretrained=pretrained, **kwargs)
@register_model
def cs3darknet_x(pretrained=False, **kwargs):
return _create_cspnet('cs3darknet_x', pretrained=pretrained, **kwargs)
@register_model
def cs3darknet_focus_s(pretrained=False, **kwargs):
return _create_cspnet('cs3darknet_focus_s', pretrained=pretrained, **kwargs)
@register_model
def cs3darknet_focus_m(pretrained=False, **kwargs):
return _create_cspnet('cs3darknet_focus_m', pretrained=pretrained, **kwargs)
@register_model
def cs3darknet_focus_l(pretrained=False, **kwargs):
return _create_cspnet('cs3darknet_focus_l', pretrained=pretrained, **kwargs)
@register_model
def cs3darknet_focus_x(pretrained=False, **kwargs):
return _create_cspnet('cs3darknet_focus_x', pretrained=pretrained, **kwargs)
@register_model
def cs3sedarknet_l(pretrained=False, **kwargs):
return _create_cspnet('cs3sedarknet_l', pretrained=pretrained, **kwargs)
@register_model
def cs3sedarknet_x(pretrained=False, **kwargs):
return _create_cspnet('cs3sedarknet_x', pretrained=pretrained, **kwargs)
@register_model
def cs3sedarknet_xdw(pretrained=False, **kwargs):
return _create_cspnet('cs3sedarknet_xdw', pretrained=pretrained, **kwargs)
@register_model
def cs3edgenet_x(pretrained=False, **kwargs):
return _create_cspnet('cs3edgenet_x', pretrained=pretrained, **kwargs)
@register_model
def cs3se_edgenet_x(pretrained=False, **kwargs):
return _create_cspnet('cs3se_edgenet_x', pretrained=pretrained, **kwargs)
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