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2021 Conference article Open Access OPEN

Heterogeneous document embeddings for cross-lingual text classification
Moreo A., Pedrotti A., Sebastiani F.
Funnelling (Fun) is a method for cross-lingual text classification (CLC) based on a two-tier ensemble for heterogeneous transfer learning. In Fun, 1st-tier classifiers, each working on a different, language-dependent feature space, return a vector of calibrated posterior probabilities (with one dimension for each class) for each document, and the final classification decision is taken by a meta-classifier that uses this vector as its input. The metaclassifier can thus exploit class-class correlations, and this (among other things) gives Fun an edge over CLC systems where these correlations cannot be leveraged. We here describe Generalized Funnelling (gFun), a learning ensemble where the metaclassifier receives as input the above vector of calibrated posterior probabilities, concatenated with document embeddings (aligned across languages) that embody other types of correlations, such as word-class correlations (as encoded by Word-Class Embeddings) and word-word correlations (as encoded by Multilingual Unsupervised or Supervised Embeddings). We show that gFun improves on Fun by describing experiments on two large, standard multilingual datasets for multi-label text classification.Source: SAC 2021: 36th ACM/SIGAPP Symposium On Applied Computing, pp. 685–688, Online conference, 22-26/03/2021
DOI: 10.1145/3412841.3442093
Project(s): AI4Media via OpenAIRE, ARIADNEplus via OpenAIRE, SoBigData-PlusPlus via OpenAIRE

See at: ISTI Repository Open Access | ZENODO Open Access | dl.acm.org Restricted | dl.acm.org Restricted | CNR ExploRA Restricted

2020 Report Open Access OPEN

AIMH research activities 2020
Aloia N., Amato G., Bartalesi V., Benedetti F., Bolettieri P., Carrara F., Casarosa V., Ciampi L., Concordia C., Corbara S., Esuli A., Falchi F., Gennaro C., Lagani G., Massoli F. V., Meghini C., Messina N., Metilli D., Molinari A., Moreo A., Nardi A., Pedrotti A., Pratelli N., Rabitti F., Savino P., Sebastiani F., Thanos C., Trupiano L., Vadicamo L., Vairo C.
Annual Report of the Artificial Intelligence for Media and Humanities laboratory (AIMH) research activities in 2020.

See at: ISTI Repository Open Access | CNR ExploRA Open Access