metarelation_mining
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- | === 技術概要 | + | === Technology Overview |
- | 「メタ関係発見 (Metarelation Mining)」とは「関係の関係性を見付ける」手法です。ここで系列を区別するための属性があたえられてない、多次元系列における関係を「系列の組」とした場合、「系列の組」間のメタな関係を発見することです。なお、組は順序付けられた集合(リストに似たもの)です。その中で私たちが着目し取り組みを進めているのが、等価なメタ関係の発見を行う「等価性構造(Equivalence Structure:ES)抽出」です。 | + | |
- | > {{ : | + | Metarelation mining is a process used to find “relations of relations.” We focus on relations between sequences where their roles (attributes) are unknown. In this case, metarelations of interest are relations between such relations. A technique for metarelation mining we focus on is called **equivalence structure (ES) extraction**, which allows for finding analogous metarelations (Fig. 1). |
- | > 図:等価性構造抽出の例。# | + | |
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- | ES抽出の大きな問題点は、その計算量の多さです。すべての系列の数をNとし、組の大きさをKとしたとき、探索する組の数はN個の中からK個を並べる順列になり、その中で部分列の比較も行う必要もあります。我々は直接K順列を計算するのではなく,Kを逐次的に増やす探索手法(ESIS)を提案し、これにより計算時間を削減しました。実用性を高めるために今後一層の計算時間の削減に取り組んでいます。 | + | {{ : |
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+ | Fig. 1: An illustration of ES extraction. Two three-dimensional sequences specified by tuples <#1, #2, #3> and <#8, #7, #5> are compared to validate if there is a metarelation between the three-dimensional sequences. Because a subsequence of one three-dimensional sequence shown by a blue, a red and a black box closely resembles a subsequence of the other 3d sequence, they are likely to be considered to have an analogous metarelation. | ||
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+ | In ES extraction, an analogous metarelation between two multidimensional sequences is considered found based on the comparisons of their subsequences. The implementation of such comparisons allows for finding relations between asynchronous sequences. Therefore, ES extraction can be applicable to data that are “asynchronous” and “the attribute of each sequence is unknown.” A task using such data can be a task to find metarelations between the brainwaves of a human and those of a chimpanzee. Such data are usually asynchronous, | ||
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+ | One difficulty in the ES extraction is that the brute-force search is usually not feasible. Given N sequences, the number of K-tuples is K-permutations of N, which causes a combinatorial explosion. Moreover, comparisons of subsequences are implemented for each comparison of two K-dimensional sequences specified by K-tuples. To reduce the processing time, we recently propose a method called | ||
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+ | === Related works === | ||
- | === 参考文献 === | ||
- | メタ関係発見(研究紹介) | ||
* Seiya Sato, Hiroshi Yamakawa: Bypassing combinatorial explosions in equivalence structure extraction. Knowledge and Information Systems (2021) https:// | * Seiya Sato, Hiroshi Yamakawa: Bypassing combinatorial explosions in equivalence structure extraction. Knowledge and Information Systems (2021) https:// | ||
* Seiya Satoh, Yoshinobu Takahashi, Hiroshi Yamakawa. Accelerated Equivalence Structure Extraction via Pairwise Incremental Search. KDD 2018. | * Seiya Satoh, Yoshinobu Takahashi, Hiroshi Yamakawa. Accelerated Equivalence Structure Extraction via Pairwise Incremental Search. KDD 2018. | ||
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* Hiroshi, Yamakawa. “Hippocampal Formation Mechanism Will Inspire Frame Generation for Building an Artificial General Intelligence’’. In Proc. of the International Conference on Artificial General Intelligence (AGI), 2012. pp.362--371. | * Hiroshi, Yamakawa. “Hippocampal Formation Mechanism Will Inspire Frame Generation for Building an Artificial General Intelligence’’. In Proc. of the International Conference on Artificial General Intelligence (AGI), 2012. pp.362--371. | ||
- | === 連絡先 | + | === Contact |
- | 佐藤聖也(AIST) , | + | Seiya Sato (Tokyo Denki University) , |
metarelation_mining.1630050713.txt.gz · Last modified: 2021/08/27 16:51 by ymkw