Computing text semantic relatedness using the contents and links of a

hypertext encyclopedia

Presenter : Bo-Sheng Wang 　Authors : Majid Yazdania,b,*, Andrei Popescu-Belisa

AI, 2013

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Outlines

• Motivation• Objectives• Methodology• Empirical analyses• Experiments• Conclusions• Comments

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Motivation

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• Existing measures of semantic relatedness based on lexical overlap, though widely used, are of little help when text similarity is not based on identical words.

Objectives• Therefore, they will computing text semantic

relatedness based on concepts and their relations, which have linguistic as well as extra-linguistic dimensions, remains a challenge especially in the general domain and/or over noisy

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Methodology-build concept network

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• Concept– They removed all Wikipedia articles.• (Talk,File, Image, Template, Category, Portal, and List,)

– Disambiguation pages were removed.– They set a cut-off limit of 100 non-stop words.– They extracted the corresponding anchor text

and considered it as another possible secondary title for the linked article.

Methodology

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Methodology-build concept network• Relatoins– They focus in the present study on the hyperlinks

and links computed from similarity of content, of category.

– we computed the lexical similarity between articles as the cosine similarity between the vectors derived from the articles’ texts, after stopword removal and stemming using Snowball.

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Methodology

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Methodology-VP

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Methodology-VP to weighted sets of concepts and to texts

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Methodology-Approximation

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Methodology-Approximation• T–truncated

• ε-truncated

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Methodology-Learning embedding

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Empirical analyses• Convergence of the T-truncated

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Empirical analyses

• Convergence of ε-truncated

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Empirical analyses

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Experiments

• Average training error

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Experiments

• Average training error

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Experiments

• Word Similarity

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Experiments

• Word Similarity

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Experiments

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Experiments

• Document similarity

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Experiments

• Document clustering

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Experiments

• Comparison of VP and cosine similarity

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Experiments

• Text classification

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Experiments

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Experiments

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Experiments

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Conclusions

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Comments

• Advantages

• Disadvantage

• Applications– Text categorization

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