// LOG(1, eff.first << " of " << numTargetElems * numSrcElems << " intersections calculated : ratio = "
// << double(eff.first) / double(numTargetElems * numSrcElems));
LOG(1, eff.second << " non-zero elements of " << eff.first << " total : filter efficiency = "
// LOG(1, eff.first << " of " << numTargetElems * numSrcElems << " intersections calculated : ratio = "
// << double(eff.first) / double(numTargetElems * numSrcElems));
LOG(1, eff.second << " non-zero elements of " << eff.first << " total : filter efficiency = "