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The recognition quality is evaluated through retrieval on a database with ground truth , showing the power of the vocabulary tree approach , going as high as 1 million images .
 recognition quality, vocabulary tree approach; retrieval, recognition quality; database with ground truth, retrieval
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:
 recognition quality, vocabulary tree approach; retrieval, recognition quality; database with ground truth, retrieval