One particularly interesting thing is that it looks like Tensorflow started earlier than I thought (I've always thought Gorgonia predated Tensorflow (I started a few months before giving this talk, but only announced it one year later)).
3 years later, TensorFlow is super feature packed, and I'm still trying to drive adoption for my lib. Oh well.
Here's a followup paper submitted to Usenix:
And here's a very recent publication detailing just the flow control aspects (conditionals, while loops):