Make slim_walkthrough ipython notebook python3 compatible (#1612)
Make slim_walkthrough ipython notebook python3 compatible (#1612)

* make slim_walkthrough ipython notebook python3 compatible

* make slim_walkthrough ipython notebook python3 compatible

derekjchow/models,xcyan/models,jazcollins/models,jch1/models,jiaphuan/models,jch1/models,cshallue/models,jiaphuan/models,derekjchow/models,derekjchow/models,jch1/models,jiaphuan/models,alexgorban/models,tombstone/models,cshallue/models,jazcollins/models,zbigniewwojna/text-rcnn,derekjchow/models,jch1/models,tombstone/models,jiaphuan/models,sshleifer/object_detection_kitti,jazcollins/models,tombstone/models,jazcollins/models,sshleifer/object_detection_kitti,sshleifer/object_detection_kitti,cshallue/models,alexgorban/models,xcyan/models,sshleifer/object_detection_kitti,xcyan/models,jiaphuan/models,alexgorban/models,xcyan/models,alexgorban/models,tombstone/models,sshleifer/object_detection_kitti,xcyan/models,derekjchow/models,tombstone/models,jiaphuan/models,sshleifer/object_detection_kitti,tombstone/models,jazcollins/models,xcyan/models,jch1/models,jazcollins/models,cshallue/models,cshallue/models,jch1/models,alexgorban/models