更新 detacttracking

detecttracking/tracking/trackers/reid/model/Tool.py

@@ -0,0 +1,33 @@
+import torch
+import torch.nn as nn
+import torch.nn.functional as F
+class GeM(nn.Module):
+    def __init__(self, p=3, eps=1e-6):
+        super(GeM, self).__init__()
+        self.p = nn.Parameter(torch.ones(1) * p)
+        self.eps = eps
+
+    def forward(self, x):
+        return self.gem(x, p=self.p, eps=self.eps, stride = 2)
+
+    def gem(self, x, p=3, eps=1e-6, stride = 2):
+        return F.avg_pool2d(x.clamp(min=eps).pow(p), (x.size(-2), x.size(-1)), stride=2).pow(1. / p)
+
+    def __repr__(self):
+        return self.__class__.__name__ + \
+               '(' + 'p=' + '{:.4f}'.format(self.p.data.tolist()[0]) + \
+               ', ' + 'eps=' + str(self.eps) + ')'
+
+class TripletLoss(nn.Module):
+    def __init__(self, margin):
+        super(TripletLoss, self).__init__()
+        self.margin = margin
+
+    def forward(self, anchor, positive, negative, size_average = True):
+        distance_positive = (anchor-positive).pow(2).sum(1)
+        distance_negative = (anchor-negative).pow(2).sum(1)
+        losses = F.relu(distance_negative-distance_positive+self.margin)
+        return losses.mean() if size_average else losses.sum()
+
+if __name__ == '__main__':
+    print('')