File: model.py

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import torch.nn as nn
import torchvision.models as models


class EmbeddingNet(nn.Module):
    def __init__(self, backbone=None):
        super().__init__()
        if backbone is None:
            backbone = models.resnet50(num_classes=128)

        self.backbone = backbone

    def forward(self, x):
        x = self.backbone(x)
        x = nn.functional.normalize(x, dim=1)
        return x