15. A method, comprising: identifying, by a device, main concepts and attributes in listing corpora; clustering, by the device, words, in the listing corpora, based on at least one of the main concepts or the attributes according to one or more rules, the one or more rules including one or more of: a first rule preventing clustering of words based on a frequency of appearance of words in a same listing corpora, a second rule preventing clustering of a quantitative attribute word with a qualitative attribute word, or a third rule indicating clustering of two words when characters of a first word, of the two words, are included in a second word of the two words; and providing, by the device, after clustering the words, the main concept words and the attribute words as at least a portion of a semantic model, the semantic model being used for subsequent clustering.
15. A method, comprising: identifying, by a device, main concepts and attributes in listing corpora; clustering, by the device, words, in the listing corpora, based on at least one of the main concepts or the attributes according to one or more rules, the one or more rules including one or more of: a first rule preventing clustering of words based on a frequency of appearance of words in a same listing corpora, a second rule preventing clustering of a quantitative attribute word with a qualitative attribute word, or a third rule indicating clustering of two words when characters of a first word, of the two words, are included in a second word of the two words; and providing, by the device, after clustering the words, the main concept words and the attribute words as at least a portion of a semantic model, the semantic model being used for subsequent clustering. 19. The method of claim 15 , further comprising: clustering according to the first rule prior to clustering according to the second rule or the third rule; clustering according to the second rule after clustering according to the first rule and prior to clustering according to the third rule; and clustering according to the third rule after clustering according to the first rule and the second rule.