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Commit 5c7fd409 authored by Hang Zhang's avatar Hang Zhang
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##+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
## Created by: Hang Zhang
## ECE Department, Rutgers University
## Email: zhang.hang@rutgers.edu
## Copyright (c) 2017
##
## This source code is licensed under the MIT-style license found in the
## LICENSE file in the root directory of this source tree
##+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
import math
import torch
import torch.nn as nn
import torch.nn.functional as F
from torch.autograd import Variable
import encoding
from encoding import Encoding
##+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
class Basicblock(nn.Module):
""" Pre-activation residual block
Identity Mapping in Deep Residual Networks
ref https://arxiv.org/abs/1603.05027
"""
def __init__(self, inplanes, planes, stride=1,
norm_layer=nn.BatchNorm2d):
super(Basicblock, self).__init__()
if inplanes != planes or stride !=1 :
self.downsample = True
self.residual_layer = nn.Conv2d(inplanes, planes,
kernel_size=1, stride=stride)
else:
self.downsample = False
conv_block=[]
conv_block+=[norm_layer(inplanes),
nn.ReLU(inplace=True),
nn.Conv2d(inplanes, planes, kernel_size=3,
stride=stride, padding=1),
norm_layer(planes),
nn.ReLU(inplace=True),
nn.Conv2d(planes, planes, kernel_size=3, stride=1,
padding=1)]
self.conv_block = nn.Sequential(*conv_block)
def forward(self, input):
#print(input.size())
if self.downsample:
residual = self.residual_layer(input)
else:
residual = input
return residual + self.conv_block(input)
class Bottleneck(nn.Module):
""" Pre-activation residual block
Identity Mapping in Deep Residual Networks
ref https://arxiv.org/abs/1603.05027
"""
def __init__(self, inplanes, planes, stride=1,norm_layer=nn.BatchNorm2d):
super(Bottleneck, self).__init__()
self.expansion = 4
if inplanes != planes*self.expansion or stride !=1 :
self.downsample = True
self.residual_layer = nn.Conv2d(inplanes,
planes * self.expansion, kernel_size=1, stride=stride)
else:
self.downsample = False
conv_block = []
conv_block += [norm_layer(inplanes),
nn.ReLU(inplace=True),
nn.Conv2d(inplanes, planes, kernel_size=1,
stride=1)]
conv_block += [norm_layer(planes),
nn.ReLU(inplace=True),
nn.Conv2d(planes, planes, kernel_size=3,
stride=stride, padding=1)]
conv_block += [norm_layer(planes),
nn.ReLU(inplace=True),
nn.Conv2d(planes, planes * self.expansion,
kernel_size=1, stride=1)]
self.conv_block = nn.Sequential(*conv_block)
def forward(self, x):
if self.downsample:
residual = self.residual_layer(x)
else:
residual = x
return residual + self.conv_block(x)
##+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
class ResNeXtBlock(nn.Module):
"""
Aggregated Residual Transformations for Deep Neural Networks
ref https://arxiv.org/abs/1611.05431
"""
def __init__(self, inplanes, planes, cardinality=32, base_width=4,
stride=1, expansion=4):
super(ResNeXtBlock, self).__init__()
width = int(math.floor(planes * (base_width/64.0)))
group_width = cardinality * width
conv_block = []
conv_block += [
nn.Conv2d(inplanes, group_width, kernel_size=1, bias=False),
nn.BatchNorm2d(group_width),
nn.ReLU(inplace=True),
nn.Conv2d(group_width, group_width, kernel_size=3,
stride=stride, padding=1, groups=cardinality, bias=False),
nn.BatchNorm2d(group_width),
nn.ReLU(inplace=True),
nn.Conv2d(group_width, expansion*group_width, kernel_size=1,
bias=False),
nn.BatchNorm2d(expansion*group_width),
nn.ReLU(inplace=True)]
self.conv_block = nn.Sequential(*conv_block)
if stride != 1 or inplanes != expansion*group_width:
self.downsample = True
self.residual_layer = nn.Conv2d(inplanes,
expansion*group_width, kernel_size=1, stride=stride,
bias=False)
else:
self.downsample = False
def forward(self, x):
if self.downsample:
residual = self.residual_layer(x)
else:
residual = x
return residual + self.conv_block(x)
class View(nn.Module):
def __init__(self, *args):
super(View, self).__init__()
if len(args) == 1 and isinstance(args[0], torch.Size):
self.size = args[0]
else:
self.size = torch.Size(args)
def forward(self, input):
return input.view(self.size)
##+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
class DenseBlock(nn.Module):
"""
Densely Connected Convolutional Networks
ref https://arxiv.org/abs/1608.06993
"""
def __init__(self, in_planes, growth_rate):
super(DenseBlock, self).__init__()
model = []
model += [nn.BatchNorm2d(in_planes),
nn.ReLU(inplace=True),
nn.Conv2d(in_planes, 4*growth_rate, kernel_size=1,
bias=False),
nn.BatchNorm2d(4*growth_rate),
nn.ReLU(inplace=True),
nn.Conv2d(4*growth_rate, growth_rate, kernel_size=3,
padding=1, bias=False)]
self.model = nn.Sequential(*model)
def forward(self, x):
out = self.model(x)
out = torch.cat([out,x], 1)
return out
class Transition(nn.Module):
"""
Densely Connected Convolutional Networks
ref https://arxiv.org/abs/1608.06993
"""
def __init__(self, in_planes, out_planes):
super(Transition, self).__init__()
model = []
model += [nn.BatchNorm2d(in_planes),
nn.ReLU(inplace=True),
nn.Conv2d(in_planes, out_planes, kernel_size=1,
bias=False),
nn.AvgPool2d(2)]
self.model = nn.Sequential(*model)
def forward(self, x):
return self.model(x)
##+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
class SELayer(nn.Module):
def __init__(self, channel, reduction=16):
super(SELayer, self).__init__()
self.avg_pool = nn.AdaptiveAvgPool2d(1)
out_channel = int(channel / reduction)
self.fc = nn.Sequential(
nn.Linear(channel, out_channel),
nn.ReLU(inplace=True),
nn.Linear(out_channel, channel),
nn.Sigmoid()
)
def forward(self, x):
b, c, _, _ = x.size()
y = self.avg_pool(x).view(b, c)
y = self.fc(y).view(b, c, 1, 1)
return x * y
def conv3x3(in_planes, out_planes, stride=1):
return nn.Conv2d(in_planes, out_planes, kernel_size=3, stride=stride, padding=1, bias=False)
class SEBasicBlock(nn.Module):
expansion = 1
def __init__(self, inplanes, planes, stride=1, reduction=16):
super(SEBasicBlock, self).__init__()
self.conv1 = conv3x3(inplanes, planes, stride)
self.bn1 = nn.BatchNorm2d(planes)
self.relu = nn.ReLU(inplace=True)
self.conv2 = conv3x3(planes, planes, 1)
self.bn2 = nn.BatchNorm2d(planes)
self.se = SELayer(planes, reduction)
self.stride = stride
if inplanes != planes or stride !=1 :
self.downsample = True
self.residual_layer = nn.Conv2d(inplanes, planes,
kernel_size=1, stride=stride)
else:
self.downsample = False
def forward(self, x):
residual = x
out = self.conv1(x)
out = self.bn1(out)
out = self.relu(out)
out = self.conv2(out)
out = self.bn2(out)
out = self.se(out)
if self.downsample:
residual = self.residual_layer(x)
out += residual
out = self.relu(out)
return out
class SEBottleneck(nn.Module):
expansion = 4
def __init__(self, inplanes, planes, stride=1, downsample=None, reduction=16):
super(SEBottleneck, self).__init__()
self.conv1 = nn.Conv2d(inplanes, planes, kernel_size=1, bias=False)
self.bn1 = nn.BatchNorm2d(planes)
self.conv2 = nn.Conv2d(planes, planes, kernel_size=3, stride=stride,
padding=1, bias=False)
self.bn2 = nn.BatchNorm2d(planes)
self.conv3 = nn.Conv2d(planes, planes * 4, kernel_size=1, bias=False)
self.bn3 = nn.BatchNorm2d(planes * 4)
self.relu = nn.ReLU(inplace=True)
self.se = SELayer(planes * 4, reduction)
self.stride = stride
if inplanes != planes or stride !=1 :
self.downsample = True
self.residual_layer = nn.Conv2d(inplanes, planes,
kernel_size=1, stride=stride)
else:
self.downsample = False
def forward(self, x):
residual = x
out = self.conv1(x)
out = self.bn1(out)
out = self.relu(out)
out = self.conv2(out)
out = self.bn2(out)
out = self.relu(out)
out = self.conv3(out)
out = self.bn3(out)
out = self.se(out)
if self.downsample:
residual = self.residual_layer(x)
out += residual
out = self.relu(out)
return out
##+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
class ELayer(nn.Module):
def __init__(self, channel, K=16, reduction=4):
super(ELayer, self).__init__()
out_channel = int(channel / reduction)
self.fc = nn.Sequential(
nn.Conv2d(channel, out_channel, 1),
nn.BatchNorm2d(out_channel),
nn.ReLU(inplace=True),
Encoding(D=out_channel,K=K),
nn.BatchNorm1d(K),
nn.ReLU(inplace=True),
View(-1, out_channel*K),
nn.Linear(out_channel*K, channel),
nn.Sigmoid()
)
"""
encoding.nn.View(-1, out_channel*K),
encoding.Normalize(),
"""
def forward(self, x):
b, c, _, _ = x.size()
y = self.fc(x).view(b, c, 1, 1)
return x * y
class EBasicBlock(nn.Module):
expansion = 1
def __init__(self, inplanes, planes, stride=1, K=16):
super(EBasicBlock, self).__init__()
self.conv1 = conv3x3(inplanes, planes, stride)
self.bn1 = nn.BatchNorm2d(planes)
self.relu = nn.ReLU(inplace=True)
self.conv2 = conv3x3(planes, planes, 1)
self.bn2 = nn.BatchNorm2d(planes)
self.se = ELayer(planes, K, self.expansion*4)
self.stride = stride
if inplanes != planes or stride !=1 :
self.downsample = True
self.residual_layer = nn.Conv2d(inplanes, planes,
kernel_size=1, stride=stride)
else:
self.downsample = False
def forward(self, x):
residual = x
out = self.conv1(x)
out = self.bn1(out)
out = self.relu(out)
out = self.conv2(out)
out = self.bn2(out)
out = self.se(out)
if self.downsample:
residual = self.residual_layer(x)
out += residual
out = self.relu(out)
return out
class EBottleneck(nn.Module):
expansion = 4
def __init__(self, inplanes, planes, stride=1, downsample=None, K=16):
super(EBottleneck, self).__init__()
self.conv1 = nn.Conv2d(inplanes, planes, kernel_size=1, bias=False)
self.bn1 = nn.BatchNorm2d(planes)
self.conv2 = nn.Conv2d(planes, planes, kernel_size=3,
stride=stride, padding=1, bias=False)
self.bn2 = nn.BatchNorm2d(planes)
self.conv3 = nn.Conv2d(planes, planes * self.expansion,
kernel_size=1, bias=False)
self.bn3 = nn.BatchNorm2d(planes * self.expansion)
self.relu = nn.ReLU(inplace=True)
self.se = ELayer(planes * self.expansion, K, self.expansion*4)
self.stride = stride
if inplanes != planes * self.expansion or stride !=1 :
self.downsample = True
self.residual_layer = nn.Conv2d(inplanes,
planes* self.expansion, kernel_size=1, stride=stride)
else:
self.downsample = False
def forward(self, x):
residual = x
out = self.conv1(x)
out = self.bn1(out)
out = self.relu(out)
out = self.conv2(out)
out = self.bn2(out)
out = self.relu(out)
out = self.conv3(out)
out = self.bn3(out)
out = self.se(out)
if self.downsample:
residual = self.residual_layer(x)
out += residual
out = self.relu(out)
return out
class EResNeXtBottleneck(nn.Module):
expansion = 4
"""
RexNeXt bottleneck type C (https://github.com/facebookresearch/ResNeXt/blob/master/models/resnext.lua)
"""
def __init__(self, inplanes, planes, cardinality, base_width, stride=1, downsample=None, K=32):
super(EResNeXtBottleneck, self).__init__()
D = int(math.floor(planes * (base_width/64.0)))
C = cardinality
self.conv_reduce = nn.Conv2d(inplanes, D*C, kernel_size=1, stride=1, padding=0, bias=False)
self.bn_reduce = nn.BatchNorm2d(D*C)
self.conv_conv = nn.Conv2d(D*C, D*C, kernel_size=3, stride=stride, padding=1, groups=cardinality, bias=False)
self.bn = nn.BatchNorm2d(D*C)
self.conv_expand = nn.Conv2d(D*C, planes*4, kernel_size=1, stride=1, padding=0, bias=False)
self.bn_expand = nn.BatchNorm2d(planes*4)
self.se = ELayer(planes * 4, K, self.expansion*4)
self.downsample = downsample
def forward(self, x):
residual = x
bottleneck = self.conv_reduce(x)
bottleneck = F.relu(self.bn_reduce(bottleneck), inplace=True)
bottleneck = self.conv_conv(bottleneck)
bottleneck = F.relu(self.bn(bottleneck), inplace=True)
bottleneck = self.conv_expand(bottleneck)
bottleneck = self.bn_expand(bottleneck)
bottleneck = self.se(bottleneck)
if self.downsample is not None:
residual = self.downsample(x)
return F.relu(residual + bottleneck, inplace=True)
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