We want to port all learners from torchvision: * [x] [Resnet](https://github.com/mlverse/torchvision/blob/main/R/models-resnet.R) * [x] [Alexnet](https://github.com/mlverse/torchvision/blob/main/R/models-alexnet.R) * [x] [VGG](https://github.com/mlverse/torchvision/blob/main/R/models-vgg.R) * [x] [mobilenet](https://github.com/mlverse/torchvision/blob/main/R/models-mobilenetv2.R)