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So what's the deal here? Are we simply doing something silly? Not quite. We're paying a high upfront cost when indexing so that we can have very fast queries at query time. The build_all algorithm you're watching right now is what we use when indexing documents. It extracts all the possible sparse n-grams from the input. Note, however, that we don't have to do that when querying. Because the weights are random but deterministic, at query time we can use a covering algorithm that only generates the minimal amount of n-grams required to match in the index.
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