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

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"""
TResNet: High Performance GPU-Dedicated Architecture
https://arxiv.org/pdf/2003.13630.pdf
Original model: https://github.com/mrT23/TResNet
"""
import copy
from collections import OrderedDict
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from functools import partial
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import torch
import torch.nn as nn
import torch.nn.functional as F
from .helpers import build_model_with_cfg
from .layers import SpaceToDepthModule, AntiAliasDownsampleLayer, InplaceAbn, ClassifierHead, SEModule
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from .registry import register_model
__all__ = ['tresnet_m', 'tresnet_l', 'tresnet_xl']
def _cfg(url='', **kwargs):
return {
'url': url, 'num_classes': 1000, 'input_size': (3, 224, 224), 'pool_size': (7, 7),
'crop_pct': 0.875, 'interpolation': 'bilinear',
'mean': (0, 0, 0), 'std': (1, 1, 1),
'first_conv': 'body.conv1.0', 'classifier': 'head.fc',
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**kwargs
}
default_cfgs = {
'tresnet_m': _cfg(
url='https://miil-public-eu.oss-eu-central-1.aliyuncs.com/model-zoo/ImageNet_21K_P/models/timm/tresnet_m_1k_miil_83_1.pth'),
'tresnet_m_in21k_miil': _cfg(
url='https://miil-public-eu.oss-eu-central-1.aliyuncs.com/model-zoo/ImageNet_21K_P/models/timm/tresnet_m_miil_in21k.pth', num_classes=11221),
'tresnet_l': _cfg(
url='https://github.com/rwightman/pytorch-image-models/releases/download/v0.1-tresnet/tresnet_l_81_5-235b486c.pth'),
'tresnet_xl': _cfg(
url='https://github.com/rwightman/pytorch-image-models/releases/download/v0.1-tresnet/tresnet_xl_82_0-a2d51b00.pth'),
'tresnet_m_448': _cfg(
input_size=(3, 448, 448), pool_size=(14, 14),
url='https://github.com/rwightman/pytorch-image-models/releases/download/v0.1-tresnet/tresnet_m_448-bc359d10.pth'),
'tresnet_l_448': _cfg(
input_size=(3, 448, 448), pool_size=(14, 14),
url='https://github.com/rwightman/pytorch-image-models/releases/download/v0.1-tresnet/tresnet_l_448-940d0cd1.pth'),
'tresnet_xl_448': _cfg(
input_size=(3, 448, 448), pool_size=(14, 14),
url='https://github.com/rwightman/pytorch-image-models/releases/download/v0.1-tresnet/tresnet_xl_448-8c1815de.pth')
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}
def IABN2Float(module: nn.Module) -> nn.Module:
"""If `module` is IABN don't use half precision."""
if isinstance(module, InplaceAbn):
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module.float()
for child in module.children():
IABN2Float(child)
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return module
def conv2d_iabn(ni, nf, stride, kernel_size=3, groups=1, act_layer="leaky_relu", act_param=1e-2):
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return nn.Sequential(
nn.Conv2d(
ni, nf, kernel_size=kernel_size, stride=stride, padding=kernel_size // 2, groups=groups, bias=False),
InplaceAbn(nf, act_layer=act_layer, act_param=act_param)
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)
class BasicBlock(nn.Module):
expansion = 1
def __init__(self, inplanes, planes, stride=1, downsample=None, use_se=True, aa_layer=None):
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super(BasicBlock, self).__init__()
if stride == 1:
self.conv1 = conv2d_iabn(inplanes, planes, stride=1, act_param=1e-3)
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else:
if aa_layer is None:
self.conv1 = conv2d_iabn(inplanes, planes, stride=2, act_param=1e-3)
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else:
self.conv1 = nn.Sequential(
conv2d_iabn(inplanes, planes, stride=1, act_param=1e-3),
aa_layer(channels=planes, filt_size=3, stride=2))
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self.conv2 = conv2d_iabn(planes, planes, stride=1, act_layer="identity")
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self.relu = nn.ReLU(inplace=True)
self.downsample = downsample
self.stride = stride
reduction_chs = max(planes * self.expansion // 4, 64)
self.se = SEModule(planes * self.expansion, reduction_channels=reduction_chs) if use_se else None
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def forward(self, x):
if self.downsample is not None:
residual = self.downsample(x)
else:
residual = x
out = self.conv1(x)
out = self.conv2(out)
if self.se is not None:
out = self.se(out)
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out += residual
out = self.relu(out)
return out
class Bottleneck(nn.Module):
expansion = 4
def __init__(self, inplanes, planes, stride=1, downsample=None, use_se=True,
act_layer="leaky_relu", aa_layer=None):
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super(Bottleneck, self).__init__()
self.conv1 = conv2d_iabn(
inplanes, planes, kernel_size=1, stride=1, act_layer=act_layer, act_param=1e-3)
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if stride == 1:
self.conv2 = conv2d_iabn(
planes, planes, kernel_size=3, stride=1, act_layer=act_layer, act_param=1e-3)
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else:
if aa_layer is None:
self.conv2 = conv2d_iabn(
planes, planes, kernel_size=3, stride=2, act_layer=act_layer, act_param=1e-3)
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else:
self.conv2 = nn.Sequential(
conv2d_iabn(planes, planes, kernel_size=3, stride=1, act_layer=act_layer, act_param=1e-3),
aa_layer(channels=planes, filt_size=3, stride=2))
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reduction_chs = max(planes * self.expansion // 8, 64)
self.se = SEModule(planes, reduction_channels=reduction_chs) if use_se else None
self.conv3 = conv2d_iabn(
planes, planes * self.expansion, kernel_size=1, stride=1, act_layer="identity")
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self.relu = nn.ReLU(inplace=True)
self.downsample = downsample
self.stride = stride
def forward(self, x):
if self.downsample is not None:
residual = self.downsample(x)
else:
residual = x
out = self.conv1(x)
out = self.conv2(out)
if self.se is not None:
out = self.se(out)
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out = self.conv3(out)
out = out + residual # no inplace
out = self.relu(out)
return out
class TResNet(nn.Module):
def __init__(self, layers, in_chans=3, num_classes=1000, width_factor=1.0, no_aa_jit=False,
global_pool='fast', drop_rate=0.):
self.num_classes = num_classes
self.drop_rate = drop_rate
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super(TResNet, self).__init__()
# JIT layers
space_to_depth = SpaceToDepthModule()
aa_layer = partial(AntiAliasDownsampleLayer, no_jit=no_aa_jit)
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# TResnet stages
self.inplanes = int(64 * width_factor)
self.planes = int(64 * width_factor)
conv1 = conv2d_iabn(in_chans * 16, self.planes, stride=1, kernel_size=3)
layer1 = self._make_layer(
BasicBlock, self.planes, layers[0], stride=1, use_se=True, aa_layer=aa_layer) # 56x56
layer2 = self._make_layer(
BasicBlock, self.planes * 2, layers[1], stride=2, use_se=True, aa_layer=aa_layer) # 28x28
layer3 = self._make_layer(
Bottleneck, self.planes * 4, layers[2], stride=2, use_se=True, aa_layer=aa_layer) # 14x14
layer4 = self._make_layer(
Bottleneck, self.planes * 8, layers[3], stride=2, use_se=False, aa_layer=aa_layer) # 7x7
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# body
self.body = nn.Sequential(OrderedDict([
('SpaceToDepth', space_to_depth),
('conv1', conv1),
('layer1', layer1),
('layer2', layer2),
('layer3', layer3),
('layer4', layer4)]))
self.feature_info = [
dict(num_chs=self.planes, reduction=2, module=''), # Not with S2D?
dict(num_chs=self.planes, reduction=4, module='body.layer1'),
dict(num_chs=self.planes * 2, reduction=8, module='body.layer2'),
dict(num_chs=self.planes * 4 * Bottleneck.expansion, reduction=16, module='body.layer3'),
dict(num_chs=self.planes * 8 * Bottleneck.expansion, reduction=32, module='body.layer4'),
]
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# head
self.num_features = (self.planes * 8) * Bottleneck.expansion
self.head = ClassifierHead(self.num_features, num_classes, pool_type=global_pool, drop_rate=drop_rate)
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# model initilization
for m in self.modules():
if isinstance(m, nn.Conv2d):
nn.init.kaiming_normal_(m.weight, mode='fan_out', nonlinearity='leaky_relu')
elif isinstance(m, nn.BatchNorm2d) or isinstance(m, InplaceAbn):
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nn.init.constant_(m.weight, 1)
nn.init.constant_(m.bias, 0)
# residual connections special initialization
for m in self.modules():
if isinstance(m, BasicBlock):
m.conv2[1].weight = nn.Parameter(torch.zeros_like(m.conv2[1].weight)) # BN to zero
if isinstance(m, Bottleneck):
m.conv3[1].weight = nn.Parameter(torch.zeros_like(m.conv3[1].weight)) # BN to zero
if isinstance(m, nn.Linear):
m.weight.data.normal_(0, 0.01)
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def _make_layer(self, block, planes, blocks, stride=1, use_se=True, aa_layer=None):
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downsample = None
if stride != 1 or self.inplanes != planes * block.expansion:
layers = []
if stride == 2:
# avg pooling before 1x1 conv
layers.append(nn.AvgPool2d(kernel_size=2, stride=2, ceil_mode=True, count_include_pad=False))
layers += [conv2d_iabn(
self.inplanes, planes * block.expansion, kernel_size=1, stride=1, act_layer="identity")]
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downsample = nn.Sequential(*layers)
layers = []
layers.append(block(
self.inplanes, planes, stride, downsample, use_se=use_se, aa_layer=aa_layer))
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self.inplanes = planes * block.expansion
for i in range(1, blocks):
layers.append(
block(self.inplanes, planes, use_se=use_se, aa_layer=aa_layer))
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return nn.Sequential(*layers)
def get_classifier(self):
return self.head.fc
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def reset_classifier(self, num_classes, global_pool='fast'):
self.head = ClassifierHead(
self.num_features, num_classes, pool_type=global_pool, drop_rate=self.drop_rate)
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def forward_features(self, x):
return self.body(x)
def forward(self, x):
x = self.forward_features(x)
x = self.head(x)
return x
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def _create_tresnet(variant, pretrained=False, **kwargs):
return build_model_with_cfg(
TResNet, variant, pretrained,
default_cfg=default_cfgs[variant],
feature_cfg=dict(out_indices=(1, 2, 3, 4), flatten_sequential=True),
**kwargs)
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@register_model
def tresnet_m(pretrained=False, **kwargs):
model_kwargs = dict(layers=[3, 4, 11, 3], **kwargs)
return _create_tresnet('tresnet_m', pretrained=pretrained, **model_kwargs)
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@register_model
def tresnet_m_in21k_miil(pretrained=False, **kwargs):
model_kwargs = dict(layers=[3, 4, 11, 3], **kwargs)
return _create_tresnet('tresnet_m_in21k_miil', pretrained=pretrained, **model_kwargs)
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@register_model
def tresnet_l(pretrained=False, **kwargs):
model_kwargs = dict(layers=[4, 5, 18, 3], width_factor=1.2, **kwargs)
return _create_tresnet('tresnet_l', pretrained=pretrained, **model_kwargs)
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@register_model
def tresnet_xl(pretrained=False, **kwargs):
model_kwargs = dict(layers=[4, 5, 24, 3], width_factor=1.3, **kwargs)
return _create_tresnet('tresnet_xl', pretrained=pretrained, **model_kwargs)
@register_model
def tresnet_m_448(pretrained=False, **kwargs):
model_kwargs = dict(layers=[3, 4, 11, 3], **kwargs)
return _create_tresnet('tresnet_m_448', pretrained=pretrained, **model_kwargs)
@register_model
def tresnet_l_448(pretrained=False, **kwargs):
model_kwargs = dict(layers=[4, 5, 18, 3], width_factor=1.2, **kwargs)
return _create_tresnet('tresnet_l_448', pretrained=pretrained, **model_kwargs)
@register_model
def tresnet_xl_448(pretrained=False, **kwargs):
model_kwargs = dict(layers=[4, 5, 24, 3], width_factor=1.3, **kwargs)
return _create_tresnet('tresnet_xl_448', pretrained=pretrained, **model_kwargs)