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A clone of Darts (Double-ARray Trie System)
C++ M4 Other
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Latest commit e40ce46 Nov 17, 2018

Darts-clone: A clone of Darts (Double-ARray Trie System)

Darts-clone is a clone of Darts (Double-ARray Trie System) which is a C++ header library for a static double-array trie structure.

The features of Darts-clone are as follows:

  • Half-size elements
    • Darts-clone uses 32-bit elements and Darts uses 64-bit elements. This feature simply halves the size of dictionaries.
  • Directed Acyclic Word Graph (DAWG)
    • Darts uses a basic trie to implement a dictionary. On the other hand, Darts-clone uses a Directed Acyclic Word Graph (DAWG) which is derived from a basic trie by merging its common subtrees. Darts-clone thus requires less elements than Darts if a given keyset contains many duplicate values.

Due to these features, Darts-clone can achieve better space efficiency without degrading the search performance.

Darts-clone: Darts(Double-ARay Trie System)のクローン

Darts-clone はダブル配列の C++ ヘッダライブラリである Darts のクローンであり, 以下のような特徴を持っています.

  • 要素のサイズが半分
    • Darts が 64-bit の要素を使うのに対し, Darts-clone は 32-bit の要素を使います. そのため,辞書のサイズは単純に半減します.
  • Directed Acyclic Word Graph (DAWG)
    • Darts がトライを木構造で表現しているのに対し, Darts-clone は Directed Acyclic Word Graph (DAWG) というグラフ構造を使います. DAWG は木構造の共通部分を併合することで得られるデータ構造なので, キーに関連付ける値に重複がたくさん含まれていれば, Darts-clone の方が少ない要素で辞書を構成できます.

これらの特徴により, Darts-clone は検索機能や速度を劣化させることなく, よりコンパクトな辞書を実現できます.

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