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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 .
 eigenvector solver, spectral clustering; computational cost, spectral clustering; clustering quality, spectral clustering; classification results, spectral clustering
Please list all entity pairs containing a certain relationship in the given options.Output format is "word1, word2; word3, word4". 
Option: conjunction, feature of, hyponym of, used for, part of, compare, evaluate for 
Text: {0} 
Answer:
 eigenvector solver, spectral clustering; computational cost, spectral clustering; clustering quality, spectral clustering; classification results, spectral clustering