传统Matching技术

User-item Semantic Gap
1.Features are used to represent a user and an item may be totally different.
2.Even when they partially overlap in features, it is insensible to conduct direct matching.
3.Order of words
Term level matching
corpus
document
TFIDF
BM25: a revised version of TFIDF vectors
Matching with translation model
SVD
SVD++

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