1 code implementation • 22 Mar 2024 • Olaya Pérez-Mon, Alejandro Moreo, Juan José del Coz, Pablo González
Quantification, also known as class prevalence estimation, is the supervised learning task in which a model is trained to predict the prevalence of each class in a given bag of examples.
no code implementations • 17 Mar 2024 • Silvia Corbara, Alejandro Moreo
In this paper, we investigate the potential benefits of augmenting the classifier training set with (negative) synthetic examples.
no code implementations • 31 Dec 2023 • Alejandro Moreo, Pablo González, Juan José del Coz
Several disciplines, like the social sciences, epidemiology, sentiment analysis, or market research, are interested in knowing the distribution of the classes in a population rather than the individual labels of the members thereof.
no code implementations • 3 Nov 2023 • Mattia Setzu, Silvia Corbara, Anna Monreale, Alejandro Moreo, Fabrizio Sebastiani
While a substantial amount of work has recently been devoted to enhance the performance of computational Authorship Identification (AId) systems, little to no attention has been paid to endowing AId systems with the ability to explain the reasons behind their predictions.
1 code implementation • 13 Oct 2023 • Mirko Bunse, Alejandro Moreo, Fabrizio Sebastiani, Martin Senz
Quantification, i. e., the task of training predictors of the class prevalence values in sets of unlabeled data items, has received increased attention in recent years.
1 code implementation • 6 Oct 2023 • Pablo González, Alejandro Moreo, Fabrizio Sebastiani
One finding that results from this investigation is that many existing quantification methods that had been found robust to prior probability shift are not necessarily robust to other types of dataset shift.
1 code implementation • 24 Jan 2023 • Silvia Corbara, Alejandro Moreo, Fabrizio Sebastiani
We investigate the effects on authorship identification tasks of a fundamental shift in how to conceive the vectorial representations of documents that are given as input to a supervised learner.
1 code implementation • 15 Nov 2022 • Alejandro Moreo, Manuel Francisco, Fabrizio Sebastiani
While many quantification methods have been proposed in the past for binary problems and, to a lesser extent, single-label multiclass problems, the multi-label setting (i. e., the scenario in which the classes of interest are not mutually exclusive) remains by and large unexplored.
no code implementations • 22 Nov 2021 • Andrea Esuli, Alejandro Moreo, Fabrizio Sebastiani
LeQua 2022 is a new lab for the evaluation of methods for "learning to quantify" in textual datasets, i. e., for training predictors of the relative frequencies of the classes of interest in sets of unlabelled textual documents.
1 code implementation • 27 Oct 2021 • Silvia Corbara, Alejandro Moreo, Fabrizio Sebastiani
It is well known that, within the Latin production of written text, peculiar metric schemes were followed not only in poetic compositions, but also in many prose works.
1 code implementation • 17 Sep 2021 • Alessandro Fabris, Andrea Esuli, Alejandro Moreo, Fabrizio Sebastiani
More in detail, we show that fairness under unawareness can be cast as a quantification problem and solved with proven methods from the quantification literature.
no code implementations • 17 Sep 2021 • Alejandro Moreo, Andrea Pedrotti, Fabrizio Sebastiani
In this ensemble method, 1st-tier classifiers, each working on a different and 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 metaclassifier that uses this vector as its input.
1 code implementation • 18 Jun 2021 • Alejandro Moreo, Andrea Esuli, Fabrizio Sebastiani
prevalence values) of the classes of interest in a sample of unlabelled data.
1 code implementation • 4 Nov 2020 • Alejandro Moreo, Fabrizio Sebastiani
This task originated with the observation that "Classify and Count" (CC), the trivial method of obtaining class prevalence estimates, is often a biased estimator, and thus delivers suboptimal quantification accuracy; following this observation, several methods for learning to quantify have been proposed that have been shown to outperform CC.
1 code implementation • 4 Nov 2020 • Alejandro Moreo, Fabrizio Sebastiani
It is well-known that solving quantification by means of ``classify and count'' (i. e., by classifying all unlabelled items by means of a standard classifier and counting the items that have been assigned to a given class) is less than optimal in terms of accuracy, and that more accurate quantification methods exist.
no code implementations • 22 Jun 2020 • Silvia Corbara, Alejandro Moreo, Fabrizio Sebastiani, Mirko Tavoni
We present and make available MedLatinEpi and MedLatinLit, two datasets of medieval Latin texts to be used in research on computational authorship analysis.
2 code implementations • 26 Nov 2019 • Alejandro Moreo, Andrea Esuli, Fabrizio Sebastiani
Pre-trained word embeddings encode general word semantics and lexical regularities of natural language, and have proven useful across many NLP tasks, including word sense disambiguation, machine translation, and sentiment analysis, to name a few.
3 code implementations • 16 Apr 2019 • Andrea Esuli, Alejandro Moreo, Fabrizio Sebastiani
Cross-lingual sentiment quantification (and cross-lingual \emph{text} quantification in general) has never been discussed before in the literature; we establish baseline results for the binary case by combining state-of-the-art quantification methods with methods capable of generating cross-lingual vectorial representations of the source and target documents involved.
Cross-Lingual Sentiment Classification General Classification +2
no code implementations • 28 Mar 2019 • Andrea Esuli, Alejandro Moreo, Fabrizio Sebastiani
We will show that, for the same amount of training effort, interactive learning delivers much better coding accuracy than standard "non-interactive" learning.
1 code implementation • 31 Jan 2019 • Andrea Esuli, Alejandro Moreo, Fabrizio Sebastiani
Funnelling consists of generating a two-tier classification system where all documents, irrespectively of language, are classified by the same (2nd-tier) classifier.
1 code implementation • 19 Oct 2018 • Alejandro Moreo, Andrea Esuli, Fabrizio Sebastiani
This paper introduces PyDCI, a new implementation of Distributional Correspondence Indexing (DCI) written in Python.
Ranked #2 on Sentiment Analysis on Multi-Domain Sentiment Dataset