216 lines
8.1 KiB
Python
216 lines
8.1 KiB
Python
"""BiSeNet (face-parsing.PyTorch) 网络结构，vendored。
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源自 zllrunning/face-parsing.PyTorch，结构与权重 `79999_iter.pth`（CelebAMask-HQ
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19 类）严格对应，仅修改 resnet18 骨干加载为「优先本地权重」以适配内网离线。
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hair 类别索引 = 17。
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"""
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import os
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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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import torch.utils.model_zoo as modelzoo
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resnet18_url = "https://download.pytorch.org/models/resnet18-5c106cde.pth"
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_LOCAL_RESNET18 = os.path.join(os.path.dirname(__file__), "weights", "resnet18-5c106cde.pth")
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def conv3x3(in_planes, out_planes, stride=1):
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return nn.Conv2d(in_planes, out_planes, kernel_size=3, stride=stride, padding=1, bias=False)
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class BasicBlock(nn.Module):
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def __init__(self, in_chan, out_chan, stride=1):
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super(BasicBlock, self).__init__()
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self.conv1 = conv3x3(in_chan, out_chan, stride)
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self.bn1 = nn.BatchNorm2d(out_chan)
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self.conv2 = conv3x3(out_chan, out_chan)
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self.bn2 = nn.BatchNorm2d(out_chan)
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self.relu = nn.ReLU(inplace=True)
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self.downsample = None
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if in_chan != out_chan or stride != 1:
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self.downsample = nn.Sequential(
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nn.Conv2d(in_chan, out_chan, kernel_size=1, stride=stride, bias=False),
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nn.BatchNorm2d(out_chan),
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)
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def forward(self, x):
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residual = self.conv1(x)
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residual = F.relu(self.bn1(residual))
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residual = self.conv2(residual)
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residual = self.bn2(residual)
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shortcut = x
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if self.downsample is not None:
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shortcut = self.downsample(x)
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out = shortcut + residual
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out = self.relu(out)
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return out
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def create_layer_basic(in_chan, out_chan, bnum, stride=1):
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layers = [BasicBlock(in_chan, out_chan, stride=stride)]
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for _ in range(bnum - 1):
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layers.append(BasicBlock(out_chan, out_chan, stride=1))
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return nn.Sequential(*layers)
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class Resnet18(nn.Module):
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def __init__(self):
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super(Resnet18, self).__init__()
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self.conv1 = nn.Conv2d(3, 64, kernel_size=7, stride=2, padding=3, bias=False)
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self.bn1 = nn.BatchNorm2d(64)
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self.maxpool = nn.MaxPool2d(kernel_size=3, stride=2, padding=1)
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self.layer1 = create_layer_basic(64, 64, bnum=2, stride=1)
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self.layer2 = create_layer_basic(64, 128, bnum=2, stride=2)
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self.layer3 = create_layer_basic(128, 256, bnum=2, stride=2)
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self.layer4 = create_layer_basic(256, 512, bnum=2, stride=2)
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self.init_weight()
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def forward(self, x):
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x = self.conv1(x)
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x = F.relu(self.bn1(x))
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x = self.maxpool(x)
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x = self.layer1(x)
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feat8 = self.layer2(x) # 1/8
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feat16 = self.layer3(feat8) # 1/16
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feat32 = self.layer4(feat16) # 1/32
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return feat8, feat16, feat32
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def init_weight(self):
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# 优先本地骨干权重（内网离线），缺失才回退 torch model_zoo（会查缓存）。
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if os.path.isfile(_LOCAL_RESNET18):
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state_dict = torch.load(_LOCAL_RESNET18, map_location="cpu", weights_only=False)
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else:
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state_dict = modelzoo.load_url(resnet18_url)
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self_state_dict = self.state_dict()
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for k, v in state_dict.items():
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if "fc" in k:
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continue
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self_state_dict.update({k: v})
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self.load_state_dict(self_state_dict)
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class ConvBNReLU(nn.Module):
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def __init__(self, in_chan, out_chan, ks=3, stride=1, padding=1):
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super(ConvBNReLU, self).__init__()
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self.conv = nn.Conv2d(in_chan, out_chan, kernel_size=ks, stride=stride,
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padding=padding, bias=False)
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self.bn = nn.BatchNorm2d(out_chan)
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def forward(self, x):
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x = self.conv(x)
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x = F.relu(self.bn(x))
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return x
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class BiSeNetOutput(nn.Module):
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def __init__(self, in_chan, mid_chan, n_classes):
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super(BiSeNetOutput, self).__init__()
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self.conv = ConvBNReLU(in_chan, mid_chan, ks=3, stride=1, padding=1)
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self.conv_out = nn.Conv2d(mid_chan, n_classes, kernel_size=1, bias=False)
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def forward(self, x):
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x = self.conv(x)
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x = self.conv_out(x)
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return x
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class AttentionRefinementModule(nn.Module):
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def __init__(self, in_chan, out_chan):
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super(AttentionRefinementModule, self).__init__()
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self.conv = ConvBNReLU(in_chan, out_chan, ks=3, stride=1, padding=1)
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self.conv_atten = nn.Conv2d(out_chan, out_chan, kernel_size=1, bias=False)
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self.bn_atten = nn.BatchNorm2d(out_chan)
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self.sigmoid_atten = nn.Sigmoid()
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def forward(self, x):
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feat = self.conv(x)
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atten = F.avg_pool2d(feat, feat.size()[2:])
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atten = self.conv_atten(atten)
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atten = self.bn_atten(atten)
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atten = self.sigmoid_atten(atten)
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out = torch.mul(feat, atten)
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return out
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class ContextPath(nn.Module):
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def __init__(self):
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super(ContextPath, self).__init__()
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self.resnet = Resnet18()
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self.arm16 = AttentionRefinementModule(256, 128)
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self.arm32 = AttentionRefinementModule(512, 128)
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self.conv_head32 = ConvBNReLU(128, 128, ks=3, stride=1, padding=1)
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self.conv_head16 = ConvBNReLU(128, 128, ks=3, stride=1, padding=1)
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self.conv_avg = ConvBNReLU(512, 128, ks=1, stride=1, padding=0)
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def forward(self, x):
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feat8, feat16, feat32 = self.resnet(x)
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h8, w8 = feat8.size()[2:]
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h16, w16 = feat16.size()[2:]
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h32, w32 = feat32.size()[2:]
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avg = F.avg_pool2d(feat32, feat32.size()[2:])
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avg = self.conv_avg(avg)
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avg_up = F.interpolate(avg, (h32, w32), mode="nearest")
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feat32_arm = self.arm32(feat32)
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feat32_sum = feat32_arm + avg_up
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feat32_up = F.interpolate(feat32_sum, (h16, w16), mode="nearest")
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feat32_up = self.conv_head32(feat32_up)
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feat16_arm = self.arm16(feat16)
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feat16_sum = feat16_arm + feat32_up
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feat16_up = F.interpolate(feat16_sum, (h8, w8), mode="nearest")
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feat16_up = self.conv_head16(feat16_up)
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return feat8, feat16_up, feat32_up # feat8 未用，保持与权重结构一致
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class FeatureFusionModule(nn.Module):
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def __init__(self, in_chan, out_chan):
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super(FeatureFusionModule, self).__init__()
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self.convblk = ConvBNReLU(in_chan, out_chan, ks=1, stride=1, padding=0)
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self.conv1 = nn.Conv2d(out_chan, out_chan // 4, kernel_size=1, stride=1,
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padding=0, bias=False)
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self.conv2 = nn.Conv2d(out_chan // 4, out_chan, kernel_size=1, stride=1,
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padding=0, bias=False)
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self.relu = nn.ReLU(inplace=True)
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self.sigmoid = nn.Sigmoid()
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def forward(self, fsp, fcp):
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fcat = torch.cat([fsp, fcp], dim=1)
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feat = self.convblk(fcat)
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atten = F.avg_pool2d(feat, feat.size()[2:])
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atten = self.conv1(atten)
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atten = self.relu(atten)
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atten = self.conv2(atten)
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atten = self.sigmoid(atten)
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feat_atten = torch.mul(feat, atten)
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feat_out = feat_atten + feat
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return feat_out
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class BiSeNet(nn.Module):
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def __init__(self, n_classes):
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super(BiSeNet, self).__init__()
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# 该权重(79999_iter.pth)的变体无独立 SpatialPath：
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# 直接用 ContextPath 的 resnet feat8（128ch）作为空间路径特征。
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self.cp = ContextPath()
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self.ffm = FeatureFusionModule(256, 256)
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self.conv_out = BiSeNetOutput(256, 256, n_classes)
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self.conv_out16 = BiSeNetOutput(128, 64, n_classes)
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self.conv_out32 = BiSeNetOutput(128, 64, n_classes)
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def forward(self, x):
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h, w = x.size()[2:]
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feat_res8, feat_cp8, feat_cp16 = self.cp(x)
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feat_fuse = self.ffm(feat_res8, feat_cp8)
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feat_out = self.conv_out(feat_fuse)
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feat_out16 = self.conv_out16(feat_cp8)
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feat_out32 = self.conv_out32(feat_cp16)
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feat_out = F.interpolate(feat_out, (h, w), mode="bilinear", align_corners=True)
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feat_out16 = F.interpolate(feat_out16, (h, w), mode="bilinear", align_corners=True)
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feat_out32 = F.interpolate(feat_out32, (h, w), mode="bilinear", align_corners=True)
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return feat_out, feat_out16, feat_out32
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