nashpan

Add equivalent function to Networkx's `periphery()`

1

### What is the expected enhancement? I just use retworkx to replace my networkx part, but I come across a problem, I can't find the proper retworkx API to replace...

is the eye blink useful for FLame 2020 model ?

3

I am very interested in head reconstruction, I have a question, is the eye blink useful when I use the Flame 2020 model?