MoCo v2: https://github.com/facebookresearch/moco SimCLR v2 change: - https://github.com/google-research/simclr/commit/244e7128004c5fd3c7805cf3135c79baa6c3bb96 1. add random brightness [code](https://github.com/google-research/simclr/commit/244e7128004c5fd3c7805cf3135c79baa6c3bb96#diff-bb03790fd55b7cd4b9c1f2d49f8d8e43a393f0507525cda9ca9d802835c5e002R41) 2. add projectioin head [code](https://github.com/google-research/simclr/commit/244e7128004c5fd3c7805cf3135c79baa6c3bb96#diff-fada037ad086638e65c7ae77e3d223963e9afaa26326aab0ea718f4013176e43R83) 3. select optimizer [code](https://github.com/google-research/simclr/commit/244e7128004c5fd3c7805cf3135c79baa6c3bb96#diff-47fea2f26cf62e77461d69b1d85126ff739c700aba93ea0027d271bb70e3e33aR86) 4. dynamic hidden, proj out dim [code](https://github.com/google-research/simclr/commit/244e7128004c5fd3c7805cf3135c79baa6c3bb96#diff-47fea2f26cf62e77461d69b1d85126ff739c700aba93ea0027d271bb70e3e33aR144) 5.
