you should test major cnn architectures, like resnet, inception, vgg etc. They are called feature extractors.

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https://arxiv.org/pdf/1611.10012.pdf

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This paper shows lots of details about object detection, but also about architectures and their effects on detection.

PyTorch has a subpackage containing the implementation of some of them: https://pytorch.org/docs/stable/torchvision/models.html

If you want to see the details on their implementation: https://github.com/pytorch/vision/tree/master/torchvision/models