Fastai is just amazing! I used it on the Kaggle Competition: Facial Keypoints Detection and got a score which I believe places me in the top 30%. Check out the competition here:
I made a custom loss function for this and I learned how to detect multiple image points starting from the fastai course example which demonstrated single point image regression. If you are interested, here is the kernel that produced my best submission:
https://www.kaggle.com/nitron/facial-keypoints-fastai-image-regression?scriptVersionId=14145733