Just this most recently:
https://pypi.org/project/facedetection/ 32
Which seems to be a sort of wrapper for Google Vision Face Detection API, Microsoft Projectoxford Detection API and Akamai Image Converter API? I think I had slightly less consistent results with OpenCV.
I took a detour after struggling to train conv nets on these more abstract tasks, and that’s what led me to look at Recursive Convolutional Networks – so I might have a block that’s a 7x7 conv net, and then I’ll flatten it using a really long kernel, like 1x128 with 128 layers; feed that into a 2-layer LSTM; back to a linear layer … Seems to be a noticeable improvement on standard datasets