Algorithmic Height Compression of Unordered Trees - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Theoretical Biology Année : 2016

Algorithmic Height Compression of Unordered Trees

Résumé

By nature, tree structures frequently present similarities between their sub-parts. Making use of this redundancy, different types of tree compression techniques have been designed in the literature to reduce the complexity of tree structures. A popular and efficient way to compress a tree consists of merging its isomorphic subtrees, which produces a directed acyclic graph (DAG) equivalent to the original tree. An important property of this method is that the compressed structure (i.e. the DAG), has the same height as the original tree, thus limiting partially the possibility of compression. In this paper we address the problem of further compressing this DAG in height. The difficulty is that compression must be carried out on substructures that are not exactly isomorphic as they are strictly nested within each-other. We thus introduced a notion of quasi-isomorphism between subtrees, that makes it possible to define similar patterns along any given path in a tree. We then proposed an algorithm to detect these patterns and to merge them, thus leading to compressed structures corresponding to DAGs augmented with return edges. In this way, redundant information is removed from the original tree in both width and height, thus achieving minimal structural compression. The complete compression algorithm is then illustrated on the compression of various plant-like structures.
Fichier principal
Vignette du fichier
height-tree-compression.pdf (1.32 Mo) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-01412215 , version 1 (08-12-2016)

Identifiants

Citer

Farah Ben-Naoum, Christophe Godin. Algorithmic Height Compression of Unordered Trees. Journal of Theoretical Biology, 2016, 389, pp.237 - 252. ⟨10.1016/j.jtbi.2015.10.030⟩. ⟨hal-01412215⟩
260 Consultations
423 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More