A metric normalization of tree edit distance

doi:10.1007/s11704-011-9336-2

Front Comput Sci Chin

0, Vol.

Issue () : 119-125 https://doi.org/10.1007/s11704-011-9336-2

RESEARCH ARTICLE

A metric normalization of tree edit distance

Yujian LI¹(

), Chenguang ZHANG^1,2

1. College of Computer Science and Technology, Beijing University of Technology, Beijing 100124, China; 2. College of Information Science and Technology, Hainan University, Haikou 570228, China

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Abstract

Traditional normalized tree edit distances do not satisfy the triangle inequality. We present a metric normalization method for tree edit distance, which results in a new normalized tree edit distance fulfilling the triangle inequality, under the condition that the weight function is a metric over the set of elementary edit operations with all costs of insertions/deletions having the same weight. We prove that the new distance, in the range [0, 1], is a genuine metric as a simple function of the sizes of two ordered labeled trees and the tree edit distance between them, which can be directly computed through tree edit distance with the same complexity. Based on an efficient algorithm to represent digits as ordered labeled trees, we show that the normalized tree edit metric can provide slightly better results than other existing methods in handwritten digit recognition experiments using the approximating and eliminating search algorithm (AESA) algorithm.

Keywords metric normalization tree edit distance triangle inequality approximating and eliminating search algorithm (AESA)

Corresponding Author(s): LI Yujian,Email:liyujian@bjut.edu.cn

Issue Date: 05 March 2011

Cite this article:

Yujian LI,Chenguang ZHANG. A metric normalization of tree edit distance[J]. Front Comput Sci Chin, 0, (): 119-125.

URL:

https://academic.hep.com.cn/fcs/EN/10.1007/s11704-011-9336-2
https://academic.hep.com.cn/fcs/EN/Y0/V/I/119

Fig.1 Three elementary edit operations. (a) : the node label is changed to ; (b) : all children of the node become children of its parent node ; (c) : a consecutive sequence of siblings among the children of the node become children of the node

Fig.2 The string “” and its equivalent single tree

Fig.3 The codes of eight directions

Fig.4 Two examples of ordered labeled trees generated from images of digit “0” and “5”. (a) Gray-scale images; (b) thinned binary images; (c) ordered labeled trees

Fig.5 Weight matrix for relabeling operations with labels 1-8

Fig.6 The histograms of negative (a) (, , ) and (b) (, , ) on the training set.

Tab.1 Experiment results (accuracy/%) using AESA with four different tree edit distances

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