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Running on Zero
Running on Zero
| import torch | |
| import torch.nn as nn | |
| import torch.nn.functional as F | |
| class BasicConv2d(nn.Module): | |
| def __init__(self, in_channels, out_channels, **kwargs): | |
| super().__init__() | |
| self.conv = nn.Conv2d(in_channels, out_channels, bias=False, **kwargs) | |
| self.bn = nn.BatchNorm2d(out_channels, eps=1e-5) | |
| def forward(self, x): | |
| return F.relu(self.bn(self.conv(x)), inplace=True) | |
| class Inception(nn.Module): | |
| def __init__(self): | |
| super().__init__() | |
| self.branch1x1 = BasicConv2d(128, 32, kernel_size=1, padding=0) | |
| self.branch1x1_2 = BasicConv2d(128, 32, kernel_size=1, padding=0) | |
| self.branch3x3_reduce = BasicConv2d(128, 24, kernel_size=1, padding=0) | |
| self.branch3x3 = BasicConv2d(24, 32, kernel_size=3, padding=1) | |
| self.branch3x3_reduce_2 = BasicConv2d(128, 24, kernel_size=1, padding=0) | |
| self.branch3x3_2 = BasicConv2d(24, 32, kernel_size=3, padding=1) | |
| self.branch3x3_3 = BasicConv2d(32, 32, kernel_size=3, padding=1) | |
| def forward(self, x): | |
| branch1x1 = self.branch1x1(x) | |
| branch1x1_pool = F.avg_pool2d(x, kernel_size=3, stride=1, padding=1) | |
| branch1x1_2 = self.branch1x1_2(branch1x1_pool) | |
| branch3x3_reduce = self.branch3x3_reduce(x) | |
| branch3x3 = self.branch3x3(branch3x3_reduce) | |
| branch3x3_reduce_2 = self.branch3x3_reduce_2(x) | |
| branch3x3_2 = self.branch3x3_2(branch3x3_reduce_2) | |
| branch3x3_3 = self.branch3x3_3(branch3x3_2) | |
| return torch.cat([branch1x1, branch1x1_2, branch3x3, branch3x3_3], 1) | |
| class FaceBoxes(nn.Module): | |
| def __init__(self, num_classes: int): | |
| super().__init__() | |
| self.num_classes = num_classes | |
| self.conv1 = BasicConv2d(3, 8, kernel_size=3, stride=2, padding=1) | |
| self.conv2 = BasicConv2d(8, 16, kernel_size=3, stride=2, padding=1) | |
| self.conv3 = BasicConv2d(16, 32, kernel_size=3, stride=2, padding=1) | |
| self.conv4 = BasicConv2d(32, 64, kernel_size=3, stride=2, padding=1) | |
| self.conv5 = BasicConv2d(64, 128, kernel_size=3, stride=2, padding=1) | |
| self.inception1 = Inception() | |
| self.inception2 = Inception() | |
| self.inception3 = Inception() | |
| self.conv6_1 = BasicConv2d(128, 128, kernel_size=1, stride=1, padding=0) | |
| self.conv6_2 = BasicConv2d(128, 256, kernel_size=3, stride=2, padding=1) | |
| self.conv7_1 = BasicConv2d(256, 128, kernel_size=1, stride=1, padding=0) | |
| self.conv7_2 = BasicConv2d(128, 256, kernel_size=3, stride=2, padding=1) | |
| self.loc, self.conf = self.multibox(num_classes) | |
| self.softmax = nn.Softmax(dim=-1) | |
| def multibox(self, num_classes: int): | |
| loc_layers = [ | |
| nn.Conv2d(128, 21 * 4, kernel_size=3, padding=1), | |
| nn.Conv2d(256, 1 * 4, kernel_size=3, padding=1), | |
| nn.Conv2d(256, 1 * 4, kernel_size=3, padding=1), | |
| ] | |
| conf_layers = [ | |
| nn.Conv2d(128, 21 * num_classes, kernel_size=3, padding=1), | |
| nn.Conv2d(256, 1 * num_classes, kernel_size=3, padding=1), | |
| nn.Conv2d(256, 1 * num_classes, kernel_size=3, padding=1), | |
| ] | |
| return nn.Sequential(*loc_layers), nn.Sequential(*conf_layers) | |
| def forward(self, x): | |
| sources = [] | |
| loc = [] | |
| conf = [] | |
| x = self.conv1(x) | |
| x = self.conv2(x) | |
| x = self.conv3(x) | |
| x = self.conv4(x) | |
| x = self.conv5(x) | |
| x = self.inception1(x) | |
| x = self.inception2(x) | |
| x = self.inception3(x) | |
| sources.append(x) | |
| x = self.conv6_1(x) | |
| x = self.conv6_2(x) | |
| sources.append(x) | |
| x = self.conv7_1(x) | |
| x = self.conv7_2(x) | |
| sources.append(x) | |
| for feat, l, c in zip(sources, self.loc, self.conf): | |
| loc.append(l(feat).permute(0, 2, 3, 1)) | |
| conf.append(c(feat).permute(0, 2, 3, 1)) | |
| loc = torch.cat([o.reshape(o.size(0), -1) for o in loc], 1) | |
| conf = torch.cat([o.reshape(o.size(0), -1) for o in conf], 1) | |
| return loc.view(loc.size(0), -1, 4), self.softmax(conf.view(conf.size(0), -1, self.num_classes)) | |