Use C3 following the model specification of YOLOv5 #343
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The FPN implemented by TorchVision is a bit different from the PAN layers used by YOLOv5, it will result in 4 layers of output in head with C3 (YOLOv5 only has 3 layers as a comparison), maybe we can rewrite the BackboneWithFPN in the future following the YOLOv5's PAN.