Semanlink - Favoris ; Semantic technology AND Maâli Mnasri

Recherche de Mot-clé

Recherche de Doc

Préférences...

Mots-clés liés

Clustering of text documents - France is AI 2018 - Gaël de Chalendar - Good - Maâli Mnasri - Text Similarity - Text Summarization -

Favoris ; Semantic technology AND Maâli Mnasri

Descendants partagés

Maâli Mnasri

4 Documents

Small Data is Big in AI : Train-spotting at France is AI

Tags:

2018-10-26 A propos

Intégration de la similarité entre phrases comme critère pour le résumé multi-document (2016)

Tags:

2017-07-17 A propos

Résumé Automatique Multi-Document Dynamique : État de l’Art (2015)

Tags:

2017-07-17 A propos

Quick review on Text Clustering and Text Similarity Approaches

Tags:

Author: Maali Mnasri (PhD @ CEA)

First transform text units to vectors? not always (eg. sentence similarity task using lexical word alignment). But vectors are efficient to process, and benefit from existing clustering algorithms such as k-means.

Sentence level or document level? Sentence clustering to summarise large documents.

Thematic clustering vs Semantic clustering: depends on the similarity measure.

Text similarity measures:

- Cosine similarity of tf-idf (suitable to produce thematic clusters)
- Knowledge-based Measures (wordNet) (quantify semantic relatedness of words),
- Word embedings

Examples, sample code:

- using wordnet with NLTK, and the formula to compute sentence similarities from word similarities.
- computing similarities between docs using gensim/word2vec

Which clustering algorithm?

- when we have an approximation of the clusters number, and when the similarity measure is not expensive in terms of computation time, clustering algo are suitable and fast. Sample code of k-means clustering using tf-idf vectors with scikit-learn
- Hierarchical clustering algorithms
    - don't need to give the number of clusters
    - but time consuming (calculate a similarity matrix for the sentences) 
- for voluminous data, use an incremental clustering algorithm: sentences are processed one at a time ; each new sentence is compared to each of the already formed clusters.

2017-05-18 A propos