1080
We also propose an efficient eigenvector solver which not only reduces the computational cost of spectral clustering by many folds but also improves the clustering quality and final classification results .
 used for: eigenvector solver, spectral clustering; evaluate for: computational cost, spectral clustering; evaluate for: clustering quality, spectral clustering; evaluate for: classification results, spectral clustering
Given options, please tell me the relationships of all the listed entity pairs.Output format is "relation1: word1, word2; relation2: word3, word4". 
Option: conjunction, feature of, hyponym of, used for, part of, compare, evaluate for 
Text: {0} 
 Entity Pairs:  eigenvector solver, spectral clustering; computational cost, spectral clustering; clustering quality, spectral clustering; classification results, spectral clustering 
Answer:
 used for: eigenvector solver, spectral clustering; evaluate for: computational cost, spectral clustering; evaluate for: clustering quality, spectral clustering; evaluate for: classification results, spectral clustering