I didn’t find the original nb, but I did found a conversation between sgugger and a student named Dave Luo who were sharing nbs. They were working on modifying the nb for this lesson to include the mAP metric.
Link to the thread: Mean average precision (mAP)
sgugger’s nb: https://github.com/sgugger/Deep-Learning/tree/master/mAP
daveluo’s nb: https://gist.github.com/daveluo/2ab83da32e623864e543d7251e9beef4
FWIW it looks like Dave’s is more complete. Dave made sure to include any improvements that sgugger made into his own nb. Dave’s is also very much in the exploratory notebook style… Lots of space is dedicated to visualizing results. Hope this helps!