AIlib2/segutils/core/models/deeplabv3.py

186 lines
6.4 KiB
Python

"""Pyramid Scene Parsing Network"""
import torch
import torch.nn as nn
import torch.nn.functional as F
from .segbase import SegBaseModel
from .fcn import _FCNHead
__all__ = ['DeepLabV3', 'get_deeplabv3', 'get_deeplabv3_resnet50_voc', 'get_deeplabv3_resnet101_voc',
'get_deeplabv3_resnet152_voc', 'get_deeplabv3_resnet50_ade', 'get_deeplabv3_resnet101_ade',
'get_deeplabv3_resnet152_ade']
class DeepLabV3(SegBaseModel):
r"""DeepLabV3
Parameters
----------
nclass : int
Number of categories for the training dataset.
backbone : string
Pre-trained dilated backbone network type (default:'resnet50'; 'resnet50',
'resnet101' or 'resnet152').
norm_layer : object
Normalization layer used in backbone network (default: :class:`nn.BatchNorm`;
for Synchronized Cross-GPU BachNormalization).
aux : bool
Auxiliary loss.
Reference:
Chen, Liang-Chieh, et al. "Rethinking atrous convolution for semantic image segmentation."
arXiv preprint arXiv:1706.05587 (2017).
"""
def __init__(self, nclass, backbone='resnet50', aux=False, pretrained_base=True, **kwargs):
super(DeepLabV3, self).__init__(nclass, aux, backbone, pretrained_base=pretrained_base, **kwargs)
self.head = _DeepLabHead(nclass, **kwargs)
if self.aux:
self.auxlayer = _FCNHead(1024, nclass, **kwargs)
self.__setattr__('exclusive', ['head', 'auxlayer'] if aux else ['head'])
def forward(self, x):
size = x.size()[2:]
_, _, c3, c4 = self.base_forward(x)
outputs = []
x = self.head(c4)
x = F.interpolate(x, size, mode='bilinear', align_corners=True)
outputs.append(x)
if self.aux:
auxout = self.auxlayer(c3)
auxout = F.interpolate(auxout, size, mode='bilinear', align_corners=True)
outputs.append(auxout)
return tuple(outputs)
class _DeepLabHead(nn.Module):
def __init__(self, nclass, norm_layer=nn.BatchNorm2d, norm_kwargs=None, **kwargs):
super(_DeepLabHead, self).__init__()
self.aspp = _ASPP(2048, [12, 24, 36], norm_layer=norm_layer, norm_kwargs=norm_kwargs, **kwargs)
self.block = nn.Sequential(
nn.Conv2d(256, 256, 3, padding=1, bias=False),
norm_layer(256, **({} if norm_kwargs is None else norm_kwargs)),
nn.ReLU(True),
nn.Dropout(0.1),
nn.Conv2d(256, nclass, 1)
)
def forward(self, x):
x = self.aspp(x)
return self.block(x)
class _ASPPConv(nn.Module):
def __init__(self, in_channels, out_channels, atrous_rate, norm_layer, norm_kwargs):
super(_ASPPConv, self).__init__()
self.block = nn.Sequential(
nn.Conv2d(in_channels, out_channels, 3, padding=atrous_rate, dilation=atrous_rate, bias=False),
norm_layer(out_channels, **({} if norm_kwargs is None else norm_kwargs)),
nn.ReLU(True)
)
def forward(self, x):
return self.block(x)
class _AsppPooling(nn.Module):
def __init__(self, in_channels, out_channels, norm_layer, norm_kwargs, **kwargs):
super(_AsppPooling, self).__init__()
self.gap = nn.Sequential(
nn.AdaptiveAvgPool2d(1),
nn.Conv2d(in_channels, out_channels, 1, bias=False),
norm_layer(out_channels, **({} if norm_kwargs is None else norm_kwargs)),
nn.ReLU(True)
)
def forward(self, x):
size = x.size()[2:]
pool = self.gap(x)
out = F.interpolate(pool, size, mode='bilinear', align_corners=True)
return out
class _ASPP(nn.Module):
def __init__(self, in_channels, atrous_rates, norm_layer, norm_kwargs, **kwargs):
super(_ASPP, self).__init__()
out_channels = 256
self.b0 = nn.Sequential(
nn.Conv2d(in_channels, out_channels, 1, bias=False),
norm_layer(out_channels, **({} if norm_kwargs is None else norm_kwargs)),
nn.ReLU(True)
)
rate1, rate2, rate3 = tuple(atrous_rates)
self.b1 = _ASPPConv(in_channels, out_channels, rate1, norm_layer, norm_kwargs)
self.b2 = _ASPPConv(in_channels, out_channels, rate2, norm_layer, norm_kwargs)
self.b3 = _ASPPConv(in_channels, out_channels, rate3, norm_layer, norm_kwargs)
self.b4 = _AsppPooling(in_channels, out_channels, norm_layer=norm_layer, norm_kwargs=norm_kwargs)
self.project = nn.Sequential(
nn.Conv2d(5 * out_channels, out_channels, 1, bias=False),
norm_layer(out_channels, **({} if norm_kwargs is None else norm_kwargs)),
nn.ReLU(True),
nn.Dropout(0.5)
)
def forward(self, x):
feat1 = self.b0(x)
feat2 = self.b1(x)
feat3 = self.b2(x)
feat4 = self.b3(x)
feat5 = self.b4(x)
x = torch.cat((feat1, feat2, feat3, feat4, feat5), dim=1)
x = self.project(x)
return x
def get_deeplabv3(dataset='pascal_voc', backbone='resnet50', pretrained=False, root='~/.torch/models',
pretrained_base=True, **kwargs):
acronyms = {
'pascal_voc': 'pascal_voc',
'pascal_aug': 'pascal_aug',
'ade20k': 'ade',
'coco': 'coco',
'citys': 'citys',
}
from ..data.dataloader import datasets
model = DeepLabV3(datasets[dataset].NUM_CLASS, backbone=backbone, pretrained_base=pretrained_base, **kwargs)
if pretrained:
from .model_store import get_model_file
device = torch.device(kwargs['local_rank'])
model.load_state_dict(torch.load(get_model_file('deeplabv3_%s_%s' % (backbone, acronyms[dataset]), root=root),
map_location=device))
return model
def get_deeplabv3_resnet50_voc(**kwargs):
return get_deeplabv3('pascal_voc', 'resnet50', **kwargs)
def get_deeplabv3_resnet101_voc(**kwargs):
return get_deeplabv3('pascal_voc', 'resnet101', **kwargs)
def get_deeplabv3_resnet152_voc(**kwargs):
return get_deeplabv3('pascal_voc', 'resnet152', **kwargs)
def get_deeplabv3_resnet50_ade(**kwargs):
return get_deeplabv3('ade20k', 'resnet50', **kwargs)
def get_deeplabv3_resnet101_ade(**kwargs):
return get_deeplabv3('ade20k', 'resnet101', **kwargs)
def get_deeplabv3_resnet152_ade(**kwargs):
return get_deeplabv3('ade20k', 'resnet152', **kwargs)
if __name__ == '__main__':
model = get_deeplabv3_resnet50_voc()
img = torch.randn(2, 3, 480, 480)
output = model(img)