Why three? We're going to store these trigrams as the keys in our inverted index. If we were to choose bigrams (chunks of 2), we would have very few keys in our index, up to 64k, but the posting lists on each key would be massive — too large to work with efficiently. If we went with quadgrams (chunks of 4), the posting lists would be tiny, which is a very good thing, but we would have billions of keys in our inverted index, and that's also hard to work with.
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avoid such pathological cases.10，这一点在7zip下载中也有详细论述
2026年03月19日 11:11:20