Answer 1: In ResNet v1.5, 1x1 convolution layers haven’t been removed but modified to have a stride of 1 instead of 2. Meanwhile, the original 3x3 convolution layers have been modified to have a stride of 2 instead of 1. In summary, the previous downsample responsibility has been transferred from the first 1x1 convolution layer to the 3x3 convolution layer of Bottlenecks.
Answer 2: All the changes are as above.
Besides, I’d like to know where the name “V1.5” comes from since I can’t find the source of it. Hope someone could offer a source link.