#import encoding.nn as nn
#import encoding.functions as F
import torch.nn as nn
from torch.nn import functional as F
import math
import torch.utils.model_zoo as model_zoo
import torch
import numpy as np
from torch.autograd import Variable
affine_par = True
import functools
import sys, os
from libs import InPlaceABN, InPlaceABNSync
from cc_attention import CrissCrossAttention
BatchNorm2d = functools.partial(InPlaceABNSync, activation='none')
def outS(i):
i = int(i)
i = (i+1)/2
i = int(np.ceil((i+1)/2.0))
i = (i+1)/2
return i
def conv3x3(in_planes, out_planes, stride=1):
"3x3 convolution with padding"
return nn.Conv2d(in_planes, out_planes, kernel_size=3, stride=stride,
padding=1, bias=False)
class Bottleneck(nn.Module):
expansion = 4
def __init__(self, inplanes, planes, stride=1, dilation=1, downsample=None, fist_dilation=1, multi_grid=1):
super(Bottleneck, self).__init__()
self.conv1 = nn.Conv2d(inplanes, planes, kernel_size=1, bias=False)
self.bn1 = BatchNorm2d(planes)
self.conv2 = nn.Conv2d(planes, planes, kernel_size=3, stride=stride,
padding=dilation*multi_grid, dilation=dilation*multi_grid, bias=False)
self.bn2 = BatchNorm2d(planes)
self.conv3 = nn.Conv2d(planes, planes * 4, kernel_size=1, bias=False)
self.bn3 = BatchNorm2d(planes * 4)
self.relu = nn.ReLU(inplace=False)
self.relu_inplace = nn.ReLU(inplace=True)
self.downsample = downsample
self.dilation = dilation
self.stride = stride
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)
if self.downsample is not None:
residual = self.downsample(x)
out = out + residual
out = self.relu_inplace(out)
return out
class PSPModule(nn.Module):
"""
Reference:
Zhao, Hengshuang, et al. *"Pyramid scene parsing network."*
"""
def __init__(self, features, out_features=512, sizes=(1, 2, 3, 6)):
super(PSPModule, self).__init__()
self.stages = []
self.stages = nn.ModuleList([self._make_stage(features, out_features, size) for size in sizes])
self.bottleneck = nn.Sequential(
nn.Conv2d(features+len(sizes)*out_features, out_features, kernel_size=3, padding=1, dilation=1, bias=False),
InPlaceABNSync(out_features),
nn.Dropout2d(0.1)
)
def _make_stage(self, features, out_features, size):
prior = nn.AdaptiveAvgPool2d(output_size=(size, size))
conv = nn.Conv2d(features, out_features, kernel_size=1, bias=False)
bn = InPlaceABNSync(out_features)
return nn.Sequential(prior, conv, bn)
def forward(self, feats):
h, w = feats.size(2), feats.size(3)
priors = [F.upsample(input=stage(feats), size=(h, w), mode='bilinear', align_corners=True) for stage in self.stages] + [feats]
bottle = self.bottleneck(torch.cat(priors, 1))
return bottle
class RCCAModule(nn.Module):
def __init__(self, in_channels, out_channels, num_classes):
super(RCCAModule, self).__init__()
inter_channels = in_channels // 4
self.conva = nn.Sequential(nn.Conv2d(in_channels, inter_channels, 3, padding=1, bias=False),
InPlaceABNSync(inter_channels))
self.cca = CrissCrossAttention(inter_channels)
self.convb = nn.Sequential(nn.Conv2d(inter_channels, inter_channels, 3, padding=1, bias=False),
InPlaceABNSync(inter_channels))
self.bottleneck = nn.Sequential(
nn.Conv2d(in_channels+inter_channels, out_channels, kernel_size=3, padding=1, dilation=1, bias=False),
InPlaceABNSync(out_channels),
nn.Dropout2d(0.1),
nn.Conv2d(512, num_classes, kernel_size=1, stride=1, padding=0, bias=True)
)
def forward(self, x, recurrence=1):
output = self.conva(x)
for i in range(recurrence):
output = self.cca(output)
output = self.convb(output)
output = self.bottleneck(torch.cat([x, output], 1))
return output
class ResNet(nn.Module):
def __init__(self, block, layers, num_classes):
self.inplanes = 128
super(ResNet, self).__init__()
self.conv1 = conv3x3(3, 64, stride=2)
self.bn1 = BatchNorm2d(64)
self.relu1 = nn.ReLU(inplace=False)
self.conv2 = conv3x3(64, 64)
self.bn2 = BatchNorm2d(64)
self.relu2 = nn.ReLU(inplace=False)
self.conv3 = conv3x3(64, 128)
self.bn3 = BatchNorm2d(128)
self.relu3 = nn.ReLU(inplace=False)
self.maxpool = nn.MaxPool2d(kernel_size=3, stride=2, padding=1)
self.relu = nn.ReLU(inplace=False)
self.maxpool = nn.MaxPool2d(kernel_size=3, stride=2, padding=1, ceil_mode=True) # change
self.layer1 = self._make_layer(block, 64, layers[0])
self.layer2 = self._make_layer(block, 128, layers[1], stride=2)
self.layer3 = self._make_layer(block, 256, layers[2], stride=1, dilation=2)
self.layer4 = self._make_layer(block, 512, layers[3], stride=1, dilation=4, multi_grid=(1,1,1))
#self.layer5 = PSPModule(2048, 512)
self.head = RCCAModule(2048, 512, num_classes)
self.dsn = nn.Sequential(
nn.Conv2d(1024, 512, kernel_size=3, stride=1, padding=1),
InPlaceABNSync(512),
nn.Dropout2d(0.1),
nn.Conv2d(512, num_classes, kernel_size=1, stride=1, padding=0, bias=True)
)
def get_learnable_parameters(self, freeze_layers=[True,True,True,True,False,False,False]):
lr_parameters = []
if not freeze_layers[0]:
for i in [self.conv1, self.bn1, self.conv2, self.bn2, self.conv3, self.bn3]:
params = i.named_parameters()
for name, p in params:
print(name)
lr_parameters.append(p)
layers = [self.layer1, self.layer2, self.layer3, self.layer4, self.layer5, self.layer6]
for freeze, layer in zip(freeze_layers[1:], layers):
if not freeze:
params = layer.named_parameters()
for name, p in params:
print(name)
lr_parameters.append(p)
return lr_parameters
def _make_layer(self, block, planes, blocks, stride=1, dilation=1, multi_grid=1):
downsample = None
if stride != 1 or self.inplanes != planes * block.expansion:
downsample = nn.Sequential(
nn.Conv2d(self.inplanes, planes * block.expansion,
kernel_size=1, stride=stride, bias=False),
BatchNorm2d(planes * block.expansion,affine = affine_par))
layers = []
generate_multi_grid = lambda index, grids: grids[index%len(grids)] if isinstance(grids, tuple) else 1
layers.append(block(self.inplanes, planes, stride,dilation=dilation, downsample=downsample, multi_grid=generate_multi_grid(0, multi_grid)))
self.inplanes = planes * block.expansion
for i in range(1, blocks):
layers.append(block(self.inplanes, planes, dilation=dilation, multi_grid=generate_multi_grid(i, multi_grid)))
return nn.Sequential(*layers)
def forward(self, x, recurrence=1):
x = self.relu1(self.bn1(self.conv1(x)))
x = self.relu2(self.bn2(self.conv2(x)))
x = self.relu3(self.bn3(self.conv3(x)))
x = self.maxpool(x)
x = self.layer1(x)
x = self.layer2(x)
x = self.layer3(x)
x_dsn = self.dsn(x)
x = self.layer4(x)
x = self.head(x, recurrence)
return [x, x_dsn]
def Res_Deeplab(num_classes=21):
model = ResNet(Bottleneck,[3, 4, 23, 3], num_classes)
return model
