Open Universal Correspondence Network on SIFT keypoints to all pixels 

Open Universal Correspondence Network trained on the YFCC100M photo tourism training set.
SIFT keypoints to SIFT keypoints visualization available at • Open Universal Corresp...
SIFT keypoints over 10k to all pixels visualization available at • Open Universal Corresp...
Procedure:
1. Extract SIFT Keypoints on left images + UCN features
2. find nearest neighbors of 1 in all pixels + UCN features
3. On the output of 2, find the nearest neighbors on 1 (cycle: left - right - left).
4. If the cycle doesn't close. Drop.