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247 lines
8.5 KiB
247 lines
8.5 KiB
"""Pytorch impl of Gluon Xception
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This is a port of the Gluon Xception code and weights, itself ported from a PyTorch DeepLab impl.
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Gluon model: (https://gluon-cv.mxnet.io/_modules/gluoncv/model_zoo/xception.html)
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Original PyTorch DeepLab impl: https://github.com/jfzhang95/pytorch-deeplab-xception
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Hacked together by / Copyright 2020 Ross Wightman
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"""
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from collections import OrderedDict
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import torch.nn as nn
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import torch.nn.functional as F
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from timm.data import IMAGENET_DEFAULT_MEAN, IMAGENET_DEFAULT_STD
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from .helpers import build_model_with_cfg
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from .layers import create_classifier, get_padding
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from .registry import register_model
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__all__ = ['Xception65']
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default_cfgs = {
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'gluon_xception65': {
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'url': 'https://github.com/rwightman/pytorch-image-models/releases/download/v0.1-weights/gluon_xception-7015a15c.pth',
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'input_size': (3, 299, 299),
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'crop_pct': 0.903,
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'pool_size': (10, 10),
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'interpolation': 'bicubic',
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'mean': IMAGENET_DEFAULT_MEAN,
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'std': IMAGENET_DEFAULT_STD,
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'num_classes': 1000,
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'first_conv': 'conv1',
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'classifier': 'fc'
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# The resize parameter of the validation transform should be 333, and make sure to center crop at 299x299
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},
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}
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""" PADDING NOTES
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The original PyTorch and Gluon impl of these models dutifully reproduced the
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aligned padding added to Tensorflow models for Deeplab. This padding was compensating
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for Tensorflow 'SAME' padding. PyTorch symmetric padding behaves the way we'd want it to.
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"""
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class SeparableConv2d(nn.Module):
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def __init__(self, inplanes, planes, kernel_size=3, stride=1, dilation=1, bias=False, norm_layer=None):
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super(SeparableConv2d, self).__init__()
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self.kernel_size = kernel_size
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self.dilation = dilation
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# depthwise convolution
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padding = get_padding(kernel_size, stride, dilation)
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self.conv_dw = nn.Conv2d(
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inplanes, inplanes, kernel_size, stride=stride,
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padding=padding, dilation=dilation, groups=inplanes, bias=bias)
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self.bn = norm_layer(num_features=inplanes)
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# pointwise convolution
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self.conv_pw = nn.Conv2d(inplanes, planes, kernel_size=1, bias=bias)
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def forward(self, x):
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x = self.conv_dw(x)
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x = self.bn(x)
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x = self.conv_pw(x)
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return x
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class Block(nn.Module):
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def __init__(self, inplanes, planes, stride=1, dilation=1, start_with_relu=True, norm_layer=None):
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super(Block, self).__init__()
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if isinstance(planes, (list, tuple)):
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assert len(planes) == 3
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else:
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planes = (planes,) * 3
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outplanes = planes[-1]
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if outplanes != inplanes or stride != 1:
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self.skip = nn.Sequential()
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self.skip.add_module('conv1', nn.Conv2d(
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inplanes, outplanes, 1, stride=stride, bias=False)),
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self.skip.add_module('bn1', norm_layer(num_features=outplanes))
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else:
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self.skip = None
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rep = OrderedDict()
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for i in range(3):
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rep['act%d' % (i + 1)] = nn.ReLU(inplace=True)
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rep['conv%d' % (i + 1)] = SeparableConv2d(
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inplanes, planes[i], 3, stride=stride if i == 2 else 1, dilation=dilation, norm_layer=norm_layer)
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rep['bn%d' % (i + 1)] = norm_layer(planes[i])
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inplanes = planes[i]
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if not start_with_relu:
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del rep['act1']
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else:
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rep['act1'] = nn.ReLU(inplace=False)
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self.rep = nn.Sequential(rep)
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def forward(self, x):
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skip = x
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if self.skip is not None:
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skip = self.skip(skip)
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x = self.rep(x) + skip
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return x
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class Xception65(nn.Module):
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"""Modified Aligned Xception.
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NOTE: only the 65 layer version is included here, the 71 layer variant
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was not correct and had no pretrained weights
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"""
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def __init__(self, num_classes=1000, in_chans=3, output_stride=32, norm_layer=nn.BatchNorm2d,
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drop_rate=0., global_pool='avg'):
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super(Xception65, self).__init__()
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self.num_classes = num_classes
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self.drop_rate = drop_rate
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if output_stride == 32:
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entry_block3_stride = 2
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exit_block20_stride = 2
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middle_dilation = 1
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exit_dilation = (1, 1)
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elif output_stride == 16:
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entry_block3_stride = 2
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exit_block20_stride = 1
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middle_dilation = 1
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exit_dilation = (1, 2)
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elif output_stride == 8:
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entry_block3_stride = 1
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exit_block20_stride = 1
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middle_dilation = 2
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exit_dilation = (2, 4)
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else:
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raise NotImplementedError
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# Entry flow
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self.conv1 = nn.Conv2d(in_chans, 32, kernel_size=3, stride=2, padding=1, bias=False)
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self.bn1 = norm_layer(num_features=32)
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self.act1 = nn.ReLU(inplace=True)
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self.conv2 = nn.Conv2d(32, 64, kernel_size=3, stride=1, padding=1, bias=False)
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self.bn2 = norm_layer(num_features=64)
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self.act2 = nn.ReLU(inplace=True)
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self.block1 = Block(64, 128, stride=2, start_with_relu=False, norm_layer=norm_layer)
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self.block1_act = nn.ReLU(inplace=True)
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self.block2 = Block(128, 256, stride=2, start_with_relu=False, norm_layer=norm_layer)
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self.block3 = Block(256, 728, stride=entry_block3_stride, norm_layer=norm_layer)
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# Middle flow
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self.mid = nn.Sequential(OrderedDict([('block%d' % i, Block(
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728, 728, stride=1, dilation=middle_dilation, norm_layer=norm_layer)) for i in range(4, 20)]))
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# Exit flow
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self.block20 = Block(
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728, (728, 1024, 1024), stride=exit_block20_stride, dilation=exit_dilation[0], norm_layer=norm_layer)
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self.block20_act = nn.ReLU(inplace=True)
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self.conv3 = SeparableConv2d(1024, 1536, 3, stride=1, dilation=exit_dilation[1], norm_layer=norm_layer)
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self.bn3 = norm_layer(num_features=1536)
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self.act3 = nn.ReLU(inplace=True)
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self.conv4 = SeparableConv2d(1536, 1536, 3, stride=1, dilation=exit_dilation[1], norm_layer=norm_layer)
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self.bn4 = norm_layer(num_features=1536)
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self.act4 = nn.ReLU(inplace=True)
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self.num_features = 2048
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self.conv5 = SeparableConv2d(
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1536, self.num_features, 3, stride=1, dilation=exit_dilation[1], norm_layer=norm_layer)
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self.bn5 = norm_layer(num_features=self.num_features)
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self.act5 = nn.ReLU(inplace=True)
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self.feature_info = [
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dict(num_chs=64, reduction=2, module='act2'),
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dict(num_chs=128, reduction=4, module='block1_act'),
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dict(num_chs=256, reduction=8, module='block3.rep.act1'),
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dict(num_chs=728, reduction=16, module='block20.rep.act1'),
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dict(num_chs=2048, reduction=32, module='act5'),
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]
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self.global_pool, self.fc = create_classifier(self.num_features, self.num_classes, pool_type=global_pool)
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def get_classifier(self):
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return self.fc
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def reset_classifier(self, num_classes, global_pool='avg'):
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self.num_classes = num_classes
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self.global_pool, self.fc = create_classifier(self.num_features, self.num_classes, pool_type=global_pool)
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def forward_features(self, x):
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# Entry flow
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x = self.conv1(x)
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x = self.bn1(x)
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x = self.act1(x)
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x = self.conv2(x)
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x = self.bn2(x)
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x = self.act2(x)
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x = self.block1(x)
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x = self.block1_act(x)
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# c1 = x
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x = self.block2(x)
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# c2 = x
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x = self.block3(x)
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# Middle flow
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x = self.mid(x)
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# c3 = x
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# Exit flow
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x = self.block20(x)
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x = self.block20_act(x)
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x = self.conv3(x)
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x = self.bn3(x)
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x = self.act3(x)
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x = self.conv4(x)
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x = self.bn4(x)
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x = self.act4(x)
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x = self.conv5(x)
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x = self.bn5(x)
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x = self.act5(x)
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return x
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def forward(self, x):
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x = self.forward_features(x)
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x = self.global_pool(x)
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if self.drop_rate:
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F.dropout(x, self.drop_rate, training=self.training)
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x = self.fc(x)
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return x
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def _create_gluon_xception(variant, pretrained=False, **kwargs):
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return build_model_with_cfg(
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Xception65, variant, pretrained,
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default_cfg=default_cfgs[variant],
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feature_cfg=dict(feature_cls='hook'),
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**kwargs)
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@register_model
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def gluon_xception65(pretrained=False, **kwargs):
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""" Modified Aligned Xception-65
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"""
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return _create_gluon_xception('gluon_xception65', pretrained, **kwargs)
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