Matthew Toseland wrote: > How valuable are negative samples? If you are directly connected to the > originator, you will *never* get a negative sample from it (assuming you can > unambiguously identify the requests of interest).
The target location and nearest location of a negative sample could reveal a lot. If nearestLoc==prevLoc then dist(originator,target) >= dist(prevLoc,target). Each sample gives you a range of possible originator locations, and if you get a series of linkable samples you can intersect the ranges. Example: a peer at location 0.3 sends you an interesting request with target==0.7 and nearestLoc==prevLoc, so dist(originator,0.7) >= dist(0.3,0.7), so the originator's between 0.1 and 0.3. Then the same peer sends you another interesting request with target==0.9 and nearestLoc==prevLoc, so dist(originator,0.9) >= dist(0.3,0.9), so the originator's between 0.3 and 0.5. Your peer must be the originator. Cheers, Michael
