Resnet
bottleneck
1x1の畳み込みでチャネル数を減らす
https://gyazo.com/68cecfc8ae68caf5b658fae183564abd
https://cvml-expertguide.net/terms/dl/cnn-backbone/resnet/
https://gyazo.com/815a3df883b360a24edfa10167baa210