Running the simple example gives MRR and Accuracy as 0.0

[delip]

This is after fixing issue #18

Number of nodes: 4
Number of edges: 5
1: delta:0.5491498679251984 obj:2.1960180733906567
2: delta:0.10661104947846078 obj:2.01739037613283
3: delta:0.04077357380979312 obj:1.9000600041927704
4: delta:0.02015839412263533 obj:1.8626257274679043
5: delta:0.011605686605780988 obj:1.8464512420420467
6: delta:0.0065220398546859525 obj:1.8351359645562653
7: delta:0.0037211986986449342 obj:1.830067299741951
8: delta:0.0021141925168267142 obj:1.8267260410463952
9: delta:0.0012035394144654606 obj:1.825039556510467
TIME: 0.014
Accuracy: 0.0
MRR: 0.0