I love seeing this, and not just because I love PyTorch[1].

It's also because I believe it's in everyone's best interest to have more than one widely used framework controlled by a single company (TensorFlow).

Also, I think fast.ai's approach to teaching deep learning is the right one for the vast majority of developers: start with practical, immediately useful know-how instead of theoretical underpinnings. People who want to delve deeper, say, so they can develop innovative architectures, can always do so at their own pace after taking fast.ai's course. There are a ton of other online resources for learning subjects like linear algebra, multivariate calculus, statistics, probabilistic graphical models, etc.

[1] Here's why I love PyTorch: https://news.ycombinator.com/item?id=14947076