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Conference papers
Modeling topic dependencies in semantically coherent text spans with copulas
Abstract : The exchangeability assumption in topic models like Latent Dirichlet Allocation (LDA) often results in inferring inconsistent topics for the words of text spans like noun-phrases, which are usually expected to be topically coherent. We propose copulaLDA, that extends LDA by integrating part of the text structure to the model and relaxes the conditional independence assumption between the word-specific latent topics given the per-document topic distributions. To this end, we assume that the words of text spans like noun-phrases are topically bound and we model this dependence with copulas. We demonstrate empirically the effectiveness of copulaLDA on both intrinsic and extrinsic evaluation tasks on several publicly available corpora.
Keywords :
Copulas
https://hal.archives-ouvertes.fr/hal-01406613
Contributor : Massih-Reza Amini <>
Submitted on : Thursday, December 1, 2016 - 1:33:54 PM
Last modification on : Thursday, November 19, 2020 - 1:01:56 PM
Contributor : Massih-Reza Amini <>
Submitted on : Thursday, December 1, 2016 - 1:33:54 PM
Last modification on : Thursday, November 19, 2020 - 1:01:56 PM