update

ytracking/tracking/trackers/reid/model/resnet_face.py

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+""" Resnet_IR_SE in ArcFace """
+
+import torch
+import torch.nn as nn
+import torch.nn.functional as F
+
+
+class Flatten(nn.Module):
+    def forward(self, x):
+        return x.reshape(x.shape[0], -1)
+
+
+class SEConv(nn.Module):
+    """Use Convolution instead of FullyConnection in SE"""
+
+    def __init__(self, channels, reduction):
+        super().__init__()
+        self.net = nn.Sequential(
+            nn.AdaptiveAvgPool2d(1),
+            nn.Conv2d(channels, channels // reduction, kernel_size=1, bias=False),
+            nn.ReLU(inplace=True),
+            nn.Conv2d(channels // reduction, channels, kernel_size=1, bias=False),
+            nn.Sigmoid(),
+        )
+
+    def forward(self, x):
+        return self.net(x) * x
+
+
+class SE(nn.Module):
+
+    def __init__(self, channels, reduction):
+        super().__init__()
+        self.net = nn.Sequential(
+            nn.AdaptiveAvgPool2d(1),
+            nn.Linear(channels, channels // reduction),
+            nn.ReLU(inplace=True),
+            nn.Linear(channels // reduction, channels),
+            nn.Sigmoid(),
+        )
+
+    def forward(self, x):
+        return self.net(x) * x
+
+
+class IRSE(nn.Module):
+
+    def __init__(self, channels, depth, stride):
+        super().__init__()
+        if channels == depth:
+            self.shortcut = nn.MaxPool2d(kernel_size=1, stride=stride)
+        else:
+            self.shortcut = nn.Sequential(
+                nn.Conv2d(channels, depth, (1, 1), stride, bias=False), 
+                nn.BatchNorm2d(depth),
+            )
+        self.residual = nn.Sequential(
+            nn.BatchNorm2d(channels),
+            nn.Conv2d(channels, depth, (3, 3), 1, 1, bias=False),
+            nn.PReLU(depth),
+            nn.Conv2d(depth, depth, (3, 3), stride, 1, bias=False),
+            nn.BatchNorm2d(depth),
+            SEConv(depth, 16),
+        )
+
+    def forward(self, x):
+        return self.shortcut(x) + self.residual(x)
+
+class ResIRSE(nn.Module):
+    """Resnet50-IRSE backbone"""
+
+    def __init__(self, ih,embedding_size, drop_ratio):
+        super().__init__()
+        ih_last = ih // 16
+        self.input_layer = nn.Sequential(
+            nn.Conv2d(3, 64, (3, 3), 1, 1, bias=False),
+            nn.BatchNorm2d(64),
+            nn.PReLU(64),
+        )
+        self.output_layer = nn.Sequential(
+            nn.BatchNorm2d(512),
+            nn.Dropout(drop_ratio),
+            Flatten(),
+            nn.Linear(512 * ih_last * ih_last, embedding_size),
+            nn.BatchNorm1d(embedding_size),
+        )
+
+        # ["channels", "depth", "stride"],
+        self.res50_arch = [
+            [64, 64, 2], [64, 64, 1], [64, 64, 1],
+            [64, 128, 2], [128, 128, 1], [128, 128, 1], [128, 128, 1],
+            [128, 256, 2], [256, 256, 1], [256, 256, 1], [256, 256, 1], [256, 256, 1],
+            [256, 256, 1], [256, 256, 1], [256, 256, 1], [256, 256, 1], [256, 256, 1],
+            [256, 256, 1], [256, 256, 1], [256, 256, 1], [256, 256, 1],
+            [256, 512, 2], [512, 512, 1], [512, 512, 1],
+        ]
+
+        self.body = nn.Sequential(*[ IRSE(a,b,c) for (a,b,c) in self.res50_arch ])
+
+    def forward(self, x):
+        x = self.input_layer(x)
+        x = self.body(x)
+        x = self.output_layer(x) 
+        return x
+
+
+if __name__ == "__main__":
+    from PIL import Image
+    import numpy as np
+
+    x = Image.open("../samples/009.jpg").convert('L')
+    x = x.resize((128, 128))
+    x = np.asarray(x, dtype=np.float32)    
+    x = x[None, None, ...]
+    x = torch.from_numpy(x)
+    net = ResIRSE(512, 0.6)
+    net.eval()
+    with torch.no_grad():
+        out = net(x)
+    print(out.shape)