def __init__()

in segmentation/model/pspnet.py [0:0]

• 46 lines of code
• 11 McCabe index (conditional complexity)

    def __init__(self, layers=50, bins=(1, 2, 3, 6), dropout=0.1, classes=2, zoom_factor=8, use_ppm=True, criterion=nn.CrossEntropyLoss(ignore_index=255), pretrained=True):
        super(PSPNet, self).__init__()
        assert layers in [50, 101, 152]
        assert 2048 % len(bins) == 0
        assert classes > 1
        assert zoom_factor in [1, 2, 4, 8]
        self.zoom_factor = zoom_factor
        self.use_ppm = use_ppm
        self.criterion = criterion

        if layers == 50:
            resnet = models.resnet50(pretrained=pretrained)
        elif layers == 101:
            resnet = models.resnet101(pretrained=pretrained)
        else:
            resnet = models.resnet152(pretrained=pretrained)
        #self.layer0 = nn.Sequential(resnet.conv1, resnet.bn1, resnet.relu, resnet.conv2, resnet.bn2, resnet.relu, resnet.conv3, resnet.bn3, resnet.relu, resnet.maxpool)
        self.layer0 = nn.Sequential(resnet.conv1, resnet.bn1, resnet.relu, resnet.maxpool)

        self.layer1, self.layer2, self.layer3, self.layer4 = resnet.layer1, resnet.layer2, resnet.layer3, resnet.layer4

        for n, m in self.layer3.named_modules():
            if 'conv2' in n:
                m.dilation, m.padding, m.stride = (2, 2), (2, 2), (1, 1)
            elif 'downsample.0' in n:
                m.stride = (1, 1)
        for n, m in self.layer4.named_modules():
            if 'conv2' in n:
                m.dilation, m.padding, m.stride = (4, 4), (4, 4), (1, 1)
            elif 'downsample.0' in n:
                m.stride = (1, 1)

        fea_dim = 2048
        if use_ppm:
            self.ppm = PPM(fea_dim, int(fea_dim/len(bins)), bins)
            fea_dim *= 2
        self.cls = nn.Sequential(
            nn.Conv2d(fea_dim, 512, kernel_size=3, padding=1, bias=False),
            nn.BatchNorm2d(512),
            nn.ReLU(inplace=True),
            nn.Dropout2d(p=dropout),
            nn.Conv2d(512, classes, kernel_size=1)
        )
        if self.training:
            self.aux = nn.Sequential(
                nn.Conv2d(1024, 256, kernel_size=3, padding=1, bias=False),
                nn.BatchNorm2d(256),
                nn.ReLU(inplace=True),
                nn.Dropout2d(p=dropout),
                nn.Conv2d(256, classes, kernel_size=1)
            )