25 lines
1.2 KiB
Markdown
25 lines
1.2 KiB
Markdown
# Index
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These are components that offer functionality for the [index-service](../../services-core/index-service).
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## Indexes
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There are two indexes with accompanying tools for constructing them.
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* [index-reverse](index-reverse/) is code for `word->document` indexes. There are two such indexes, one containing only document-word pairs that are flagged as important, e.g. the word appears in the title or has a high TF-IDF. This allows good results to be discovered quickly without having to sift through ten thousand bad ones first.
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* [index-forward](index-forward/) is the `document->word` index containing metadata about each word, such as its position. It is used after identifying candidate search results via the reverse index to fetch metadata and rank the results.
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These indices rely heavily on the [libraries/btree](../../libraries/btree) and [libraries/array](../../libraries/array) components.
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## Algorithms
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* [domain-ranking](domain-ranking/) contains domain ranking algorithms.
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* [result-ranking](result-ranking/) contains logic for ranking search results by relevance.
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# Libraries
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* [index-query](index-query/) contains structures for evaluating search queries.
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* [index-journal](index-journal/) contains tools for writing and reading index data.
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