6301
However , speech quality of the converted singing voice is significantly degraded compared to that of a natural singing voice due to various factors , such as analysis and modeling errors in the vocoder-based framework .
 evaluate for: speech quality, converted singing voice; evaluate for: speech quality, natural singing voice; compare: converted singing voice, natural singing voice
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:  speech quality, converted singing voice; speech quality, natural singing voice; converted singing voice, natural singing voice 
Answer:
 evaluate for: speech quality, converted singing voice; evaluate for: speech quality, natural singing voice; compare: converted singing voice, natural singing voice