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