Fergal Cotter (Engineering) presented Deep residual learning for image recognition, He, Zhang, Ren, and Sun, 2015 [pdf].
Also, a hint about his own work on “lifting” residual networks to interpret deep nodes in a neural network [Jupyter]
Damon Wischik (Computer Lab) briefly described You only look once: unified real-time object detection, Redmon et al., 2015 [arXiv]
talks.cam.ac.uk listing