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| import torch | |
| import torch.nn as nn | |
| import torch.nn.functional as F | |
| def conv_bn(inp, oup, stride=1, leaky=0): | |
| return nn.Sequential( | |
| nn.Conv2d(inp, oup, 3, stride, 1, bias=False), nn.BatchNorm2d(oup), | |
| nn.LeakyReLU(negative_slope=leaky, inplace=True)) | |
| def conv_bn_no_relu(inp, oup, stride): | |
| return nn.Sequential( | |
| nn.Conv2d(inp, oup, 3, stride, 1, bias=False), | |
| nn.BatchNorm2d(oup), | |
| ) | |
| def conv_bn1X1(inp, oup, stride, leaky=0): | |
| return nn.Sequential( | |
| nn.Conv2d(inp, oup, 1, stride, padding=0, bias=False), nn.BatchNorm2d(oup), | |
| nn.LeakyReLU(negative_slope=leaky, inplace=True)) | |
| def conv_dw(inp, oup, stride, leaky=0.1): | |
| return nn.Sequential( | |
| nn.Conv2d(inp, inp, 3, stride, 1, groups=inp, bias=False), | |
| nn.BatchNorm2d(inp), | |
| nn.LeakyReLU(negative_slope=leaky, inplace=True), | |
| nn.Conv2d(inp, oup, 1, 1, 0, bias=False), | |
| nn.BatchNorm2d(oup), | |
| nn.LeakyReLU(negative_slope=leaky, inplace=True), | |
| ) | |
| class SSH(nn.Module): | |
| def __init__(self, in_channel, out_channel): | |
| super(SSH, self).__init__() | |
| assert out_channel % 4 == 0 | |
| leaky = 0 | |
| if (out_channel <= 64): | |
| leaky = 0.1 | |
| self.conv3X3 = conv_bn_no_relu(in_channel, out_channel // 2, stride=1) | |
| self.conv5X5_1 = conv_bn(in_channel, out_channel // 4, stride=1, leaky=leaky) | |
| self.conv5X5_2 = conv_bn_no_relu(out_channel // 4, out_channel // 4, stride=1) | |
| self.conv7X7_2 = conv_bn(out_channel // 4, out_channel // 4, stride=1, leaky=leaky) | |
| self.conv7x7_3 = conv_bn_no_relu(out_channel // 4, out_channel // 4, stride=1) | |
| def forward(self, input): | |
| conv3X3 = self.conv3X3(input) | |
| conv5X5_1 = self.conv5X5_1(input) | |
| conv5X5 = self.conv5X5_2(conv5X5_1) | |
| conv7X7_2 = self.conv7X7_2(conv5X5_1) | |
| conv7X7 = self.conv7x7_3(conv7X7_2) | |
| out = torch.cat([conv3X3, conv5X5, conv7X7], dim=1) | |
| out = F.relu(out) | |
| return out | |
| class FPN(nn.Module): | |
| def __init__(self, in_channels_list, out_channels): | |
| super(FPN, self).__init__() | |
| leaky = 0 | |
| if (out_channels <= 64): | |
| leaky = 0.1 | |
| self.output1 = conv_bn1X1(in_channels_list[0], out_channels, stride=1, leaky=leaky) | |
| self.output2 = conv_bn1X1(in_channels_list[1], out_channels, stride=1, leaky=leaky) | |
| self.output3 = conv_bn1X1(in_channels_list[2], out_channels, stride=1, leaky=leaky) | |
| self.merge1 = conv_bn(out_channels, out_channels, leaky=leaky) | |
| self.merge2 = conv_bn(out_channels, out_channels, leaky=leaky) | |
| def forward(self, input): | |
| # names = list(input.keys()) | |
| # input = list(input.values()) | |
| output1 = self.output1(input[0]) | |
| output2 = self.output2(input[1]) | |
| output3 = self.output3(input[2]) | |
| up3 = F.interpolate(output3, size=[output2.size(2), output2.size(3)], mode='nearest') | |
| output2 = output2 + up3 | |
| output2 = self.merge2(output2) | |
| up2 = F.interpolate(output2, size=[output1.size(2), output1.size(3)], mode='nearest') | |
| output1 = output1 + up2 | |
| output1 = self.merge1(output1) | |
| out = [output1, output2, output3] | |
| return out | |
| class MobileNetV1(nn.Module): | |
| def __init__(self): | |
| super(MobileNetV1, self).__init__() | |
| self.stage1 = nn.Sequential( | |
| conv_bn(3, 8, 2, leaky=0.1), # 3 | |
| conv_dw(8, 16, 1), # 7 | |
| conv_dw(16, 32, 2), # 11 | |
| conv_dw(32, 32, 1), # 19 | |
| conv_dw(32, 64, 2), # 27 | |
| conv_dw(64, 64, 1), # 43 | |
| ) | |
| self.stage2 = nn.Sequential( | |
| conv_dw(64, 128, 2), # 43 + 16 = 59 | |
| conv_dw(128, 128, 1), # 59 + 32 = 91 | |
| conv_dw(128, 128, 1), # 91 + 32 = 123 | |
| conv_dw(128, 128, 1), # 123 + 32 = 155 | |
| conv_dw(128, 128, 1), # 155 + 32 = 187 | |
| conv_dw(128, 128, 1), # 187 + 32 = 219 | |
| ) | |
| self.stage3 = nn.Sequential( | |
| conv_dw(128, 256, 2), # 219 +3 2 = 241 | |
| conv_dw(256, 256, 1), # 241 + 64 = 301 | |
| ) | |
| self.avg = nn.AdaptiveAvgPool2d((1, 1)) | |
| self.fc = nn.Linear(256, 1000) | |
| def forward(self, x): | |
| x = self.stage1(x) | |
| x = self.stage2(x) | |
| x = self.stage3(x) | |
| x = self.avg(x) | |
| # x = self.model(x) | |
| x = x.view(-1, 256) | |
| x = self.fc(x) | |
| return x | |
| class ClassHead(nn.Module): | |
| def __init__(self, inchannels=512, num_anchors=3): | |
| super(ClassHead, self).__init__() | |
| self.num_anchors = num_anchors | |
| self.conv1x1 = nn.Conv2d(inchannels, self.num_anchors * 2, kernel_size=(1, 1), stride=1, padding=0) | |
| def forward(self, x): | |
| out = self.conv1x1(x) | |
| out = out.permute(0, 2, 3, 1).contiguous() | |
| return out.view(out.shape[0], -1, 2) | |
| class BboxHead(nn.Module): | |
| def __init__(self, inchannels=512, num_anchors=3): | |
| super(BboxHead, self).__init__() | |
| self.conv1x1 = nn.Conv2d(inchannels, num_anchors * 4, kernel_size=(1, 1), stride=1, padding=0) | |
| def forward(self, x): | |
| out = self.conv1x1(x) | |
| out = out.permute(0, 2, 3, 1).contiguous() | |
| return out.view(out.shape[0], -1, 4) | |
| class LandmarkHead(nn.Module): | |
| def __init__(self, inchannels=512, num_anchors=3): | |
| super(LandmarkHead, self).__init__() | |
| self.conv1x1 = nn.Conv2d(inchannels, num_anchors * 10, kernel_size=(1, 1), stride=1, padding=0) | |
| def forward(self, x): | |
| out = self.conv1x1(x) | |
| out = out.permute(0, 2, 3, 1).contiguous() | |
| return out.view(out.shape[0], -1, 10) | |
| def make_class_head(fpn_num=3, inchannels=64, anchor_num=2): | |
| classhead = nn.ModuleList() | |
| for i in range(fpn_num): | |
| classhead.append(ClassHead(inchannels, anchor_num)) | |
| return classhead | |
| def make_bbox_head(fpn_num=3, inchannels=64, anchor_num=2): | |
| bboxhead = nn.ModuleList() | |
| for i in range(fpn_num): | |
| bboxhead.append(BboxHead(inchannels, anchor_num)) | |
| return bboxhead | |
| def make_landmark_head(fpn_num=3, inchannels=64, anchor_num=2): | |
| landmarkhead = nn.ModuleList() | |
| for i in range(fpn_num): | |
| landmarkhead.append(LandmarkHead(inchannels, anchor_num)) | |
| return landmarkhead | |