learning to really take off not just as a research topic but also as an industry of practice is that the you can use a pre trained classifier for a lot of commercial a downstream tasks so a pre trained imagenet state-of-the-art emission a classifier like a rest at 50 can just be taken and the same backbone can be taken and put into a faster or CNN or a mass for CNN or a retina net and can be used for object detection or instant segmentation or it can also be used in a fully compositional neural net with the backbone as the rest in 54 a