Stride for layer4 in resnet

[ruotianluo]

@philokey, I will create a new branch for this so that the current pretrained won't be messed up.

This issue was originally opened in ruotianluo/pytorch-resnet#2

[ruotianluo]

You can check the convert_from_tensorflow branch now.

[philokey]

Thanks, I will try it.

[ruotianluo]

It's now significantly slower (because the stride 1 needs more computation) than tf-faster-rcnn, I will investigate what's the bottleneck. (0.31 -> 0.37 s per iter)

[Feynman27]

@ruotianluo I'm trying to train a resnet101+faster rcnn model starting from image net weights. Changing the stride in layer4 from 2->1 does indeed increase the training time. Did you ever resolve the bottleneck?

[ruotianluo]

@Feynman27 I haven't profiled the code in detail. But it should be faster after commit df3cc05