Any explained articles for PyTorch source code(backend)?

I had been deeply involved in (py)torch but did not work much after v0.4.0-release. Recently I found many really amazing features introduced during a year and decided to go back to pytorch.
Since backend is always my interest, I noticed that old C implemented backend had been thoroughly re-designed. I want to have a quick glimpse about the design and architecture(mostly aten), but most articles are before 2018.

Ahhhh, this post is good enough. Google says it is a Mar 18’ post. However, the author continues to keep the article up to date. Google fools me. :laughing: