Hi! Primary developer for Spinning Up here. The code for this was developed mostly in June and July this year, and Eager still felt relatively new to me. I wanted to wait for Eager to stabilize and hit maturity before investing in it. I also wanted to see how TF would change on the road to TF 2.0, since that could change the picture even more.

At the six month review in 2019, we'll evaluate whether it makes sense to rewrite the implementation examples for TF 2.0. I'll speculate that the answer will be "yes, it does." Since Eager execution will be a central feature of TF 2.0, the (probable) revamp for Spinning Up will include it.

Good luck with your experiments! And please let us know about your experience with Spinning Up---we want to make sure it fulfills the mission of helping anyone learn about deep RL, and user feedback is vital for that.