Moshe Koppel

Moshe Koppel
Bar Ilan University | BIU · Department of Computer Science

About

134
Publications
63,822
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
5,669
Citations
Citations since 2017
12 Research Items
2846 Citations
20172018201920202021202220230100200300400500600
20172018201920202021202220230100200300400500600
20172018201920202021202220230100200300400500600
20172018201920202021202220230100200300400500600
Introduction
Skills and Expertise

Publications

Publications (134)
Preprint
Full-text available
We present a new pre-trained language model (PLM) for modern Hebrew, termed AlephBERTGimmel, which employs a much larger vocabulary (128K items) than standard Hebrew PLMs before. We perform a contrastive analysis of this model against all previous Hebrew PLMs (mBERT, heBERT, AlephBERT) and assess the effects of larger vocabularies on task performan...
Preprint
Full-text available
We present a new pre-trained language model (PLM) for Rabbinic Hebrew, termed Berel (BERT Embeddings for Rabbinic-Encoded Language). Whilst other PLMs exist for processing Hebrew texts (e.g., HeBERT, AlephBert), they are all trained on modern Hebrew texts, which diverges substantially from Rabbinic Hebrew in terms of its lexicographical, morphologi...
Preprint
Full-text available
One of the primary tasks of morphological parsers is the disambiguation of homographs. Particularly difficult are cases of unbalanced ambiguity, where one of the possible analyses is far more frequent than the others. In such cases, there may not exist sufficient examples of the minority analyses in order to properly evaluate performance, nor to tr...
Article
Full-text available
We consider a thought experiment in which voters could submit binary preferences regarding each of a pre-determined list of independent relevant issues, so that majorities could be tallied per issue. It might be thought that if such voting became technically feasible and widespread, parties and coalitions could be circumvented altogether and would...
Article
Many classical texts are available in multiple versions that almost always differ from each other due to transcription error and editorial discretion. One of the central challenges in the study of such texts is the preparation of a ‘synoptic’ text: an aligned presentation of the various versions in which corresponding words or phrases, even if not...
Preprint
Full-text available
We present a system for automatic diacritization of Hebrew text. The system combines modern neural models with carefully curated declarative linguistic knowledge and comprehensive manually constructed tables and dictionaries. Besides providing state of the art diacritization accuracy, the system also supports an interface for manual editing and cor...
Chapter
Brain-computer interfaces (BCIs) have been employed to provide different patient groups with communication and control that does not require the use of limbs that have been damaged. In this study, we explored BCI-based navigation in three long term amputees. Each participant attempted motor execution with the affected limb, and performed motor exec...
Article
The identification of pseudepigraphic texts—texts not written by the authors to which they are attributed—has important historical, forensic, and commercial applications. Any method for identifying such pseudepigrapha must ultimately depend on some measure of a given document’s similarity to the other documents in a corpus. We show that for this pu...
Article
Full-text available
We consider several fundamental principles of rabbinic approaches to handling uncertainty for legal purposes. We find that non-numerical versions of ideas subsequently developed in the literature on interpretations of probabilistic statements are useful for explicating these rabbinic principles.
Article
Full-text available
Arabic is a widely-spoken language with a rich and long history spanning more than fourteen centuries. Yet existing Arabic corpora largely focus on the modern period or lack sufficient diachronic information. We develop a large-scale, historical corpus of Arabic of about 1 billion words from diverse periods of time. We clean this corpus, process it...
Article
Full-text available
Purpose Social network sites have been widely adopted by politicians in the last election campaigns. To increase the effectiveness of these campaigns the potential electorate is to be identified, as targeted ads are much more effective than non-targeted ads. Therefore, the purpose of this paper is to propose and implement a new methodology for auto...
Article
Full-text available
Purpose – Reliability and political bias of mass media has been a controversial topic in the literature. The purpose of this paper is to propose and implement a methodology for fully automatic evaluation of the political tendency of the written media on the web, which does not rely on subjective human judgments. Design/methodology/approach – The u...
Article
In this paper, we shed new light on the authenticity of the Corpus Caesarianum, a group of five commentaries describing the campaigns of Julius Caesar (100-44 BC), the founder of the Roman empire. While Caesar himself has authored at least part of these commentaries, the authorship of the rest of the texts remains a puzzle that has persisted for ni...
Conference Paper
Full-text available
Introduction: One of the main goals of brain computer interface (BCI) research is providing disabled patients with some levels of communication, control of external devices, and mobility. For such patients to use BCI we need to address two major questions: i) can motor brain circuits that have been deprived of input following trauma still be used f...
Article
Full-text available
We propose a method for efficiently finding all parallel passages in a large corpus, even if the passages are not quite identical due to rephrasing and orthographic variation. The key ideas are the representation of each word in the corpus by its two most infrequent letters, finding matched pairs of strings of four or five words that differ by at m...
Article
We have developed an automated method to separate biblical texts according to author or scribal school. At the core of this new approach is the identification of correlations in word preference that are then used to quantify stylistic similarity between sections. In so doing, our method ignores literary features-such as possible repetitions, narrat...
Article
We discuss a real-world application of a recently proposed machine learning method for authorship verification. Authorship verification is considered an extremely difficult task in computational text classification, because it does not assume that the correct author of an anonymous text is included in the candidate authors available. To determine w...
Article
Full-text available
In this paper we consider automatic political tendency recognition in a variety of genres. To this end, four different types of texts in Hebrew with varying levels of political content (manifestly political, semipolitical, non-political) are examined. It is found that in each case, training and testing in the same genre yields strong results. More...
Article
We show how automatically extracted citations in historical corpora can be used to measure the direct and indirect influence of authors on each other. These measures can in turn be used to determine an author's overall prominence in the corpus and to identify distinct schools of thought. We apply our methods to two major historical corpora. Using s...
Conference Paper
Full-text available
Objective. We have developed an efficient generic machine learning (ML) tool for real-time fMRI whole brain classification, which can be used to explore novel brain-computer interface (BCI) or advanced neurofeedback (NF) strategies. Approach. We use information gain for isolating the most relevant voxels in the brain and a support vector machine cl...
Conference Paper
Full-text available
We show that it is possible to automatically detect machine translated text at sentence level from monolingual corpora, using text classification methods. We show further that the accuracy with which a learned classifier can detect text as machine translated is strongly correlated with the translation quality of the machine translation system that...
Article
Full-text available
Objective: We have developed a brain-computer interface (BCI) system based on real-time functional magnetic resonance imaging (fMRI) with virtual reality feedback. The advantage of fMRI is the relatively high spatial resolution and the coverage of the whole brain; thus we expect that it may be used to explore novel BCI strategies, based on new typ...
Chapter
Felsenthal and Machover have made substantial contributions to the measurement of voting power. It is worth bearing in mind, however, that the notion of political power is actually a quite general one of which voting power is one instantiation. In this brief paper, we consider political power in the general sense and propose a definition. We will s...
Article
Full-text available
Almost any conceivable authorship attribution problem can be reduced to one fundamental problem: whether a pair of (possibly short) documents were written by the same author. In this article, we offer an (almost) unsupervised method for solving this problem with surprisingly high accuracy. The main idea is to use repeated feature subsampling method...
Article
Full-text available
One of the crowning achievements of Yaacov Choueka’s illustrious career has been his guidance of the Bar-Ilan Responsa project from a fledgling research project to a major enterprise awarded the Israel Prize in 2008. Much of the early work on the Responsa project ultimately proved to be foundational in the now burgeoning area of information retriev...
Article
Given an unsegmented multi-author text, we wish to automatically separate out distinct authorial threads. We present a novel, entirely unsupervised, method that achieves strong results on multiple testbeds, including those for which authorial threads are topically identical. Unlike previous work, our method requires no specialized linguistic tools...
Article
Full-text available
Full natural language understanding requires identifying and analyzing the meanings of metaphors, which are ubiquitous in both text and speech. Over the last thirty years, linguistic metaphors have been shown to be based on more general conceptual metaphors, partial semantic mappings between disparate conceptual domains. Though some achievements ha...
Article
Full-text available
This paper considers four versions of the authorship attribution problem that are typically encountered in the forensic context and offers algorithmic solutions for each. Part I describes the simple authorship attribution problem described above. Part II considers the long-text verification problem, in which we are asked if two long texts are by th...
Conference Paper
Full-text available
Distinguishing between literal and metaphorical language is a major challenge facing natural language processing. Heuristically, metaphors can be divided into three general types in which type III metaphors are those involving an adjective-noun relationship (e.g. “dark humor”). This paper describes our approach for automatic identification of type...
Article
Full-text available
Attribution of anonymous texts, if not based on factors external to the text (such as paper and ink type or document provenance, as used in forensic document examination), is largely, if not entirely, based on considerations of language style. We will consider here the question of how to best deconstruct a text into quantitative features for purpos...
Article
Work on authorship attribution has traditionally focused on long texts. In this work, we tackle the question of whether the author of a very short text can be successfully identified. We use Twitter as an experimental testbed. We introduce the concept of an author's unique "signature", and show that such signatures are typical of many authors when...
Conference Paper
Full-text available
Given a multi-author document, we use unsupervised methods to identify distinct authorial threads. Although this problem is of great practical interest for security and forensic reasons, as well as for commercial purposes, this paper is, to the best of our knowledge, the first presentation of a general-purpose method for solving it.
Article
Full-text available
We introduce the “fundamental problem” of authorship attribution: determining if two, possibly short, documents were written by a single author. A solution to this problem can serve as a building block for solving almost any conceivable authorship attribution problem. Our preliminary work on this problem is based on earlier work in authorship attri...
Article
We define a family of solutions for n-person bargaining problems which generalizes the discrete Raiffa solution and approaches the continuous Raiffa solution. Each member of this family is a stepwise solution, which is a pair of functions: a step-function that determines a new disagreement point for a given bargaining problem, and a solution functi...
Chapter
Full-text available
Given a corpus of financial news items labelled according to the market reaction following their publication, we investigate ‘cotemporeneous’ and forward-looking price stock movements. Our approach is to provide a pool of relevant textual features to a machine learning algorithm to detect substantial stock price variations. Our two working hypothes...
Article
Full-text available
The Fourth International Workshop on Uncovering Plagiarism, Authorship, and Social Software Misuse (PAN10) was held in conjunction with the 2010 Conference on Multilingual and Multimodal Information Access Evaluation (CLEF-10) in Padua, Italy. The workshop was organized as a competition covering two tasks: plagiarism detection and Wikipedia vandali...
Article
Full-text available
Plagiarism is widely acknowledged to be a significant and increasing problem for higher education institutions (McCabe 2005; Judge 2008). A wide range of solutions, including several commercial systems, have been proposed to assist the educator in the ...
Article
Full-text available
Most previous work on authorship attribution has focused on the case in which we need to attribute an anonymous document to one of a small set of candidate authors. In this paper, we consider authorship attribution as found in the wild: the set of known candidates is extremely large (possibly many thousands) and might not even include the actual au...
Article
Full-text available
In this paper we demonstrate how genetic algorithms can be used to reverse engineer an evaluation function’s parameters for computer chess. Our results show that using an appropriate expert (or mentor), we can evolve a program that is on par with top tournament-playing chess programs, outperforming a two-time World Computer Chess Champion. This per...
Article
Full-text available
The Babylonian Talmud, compiled from the 2nd to 7th centuries C.E., is the primary source for all subsequent Jewish laws. It is not written in apodeictic style, but rather as a discursive record of (real or imagined) legal (and other) arguments crossing a wide range of technical topics. Thus, it is not a simple matter to infer general methodologica...
Article
Full-text available
In certain judgmental situations where a “correct” decision is presumed to exist, optimal decision making requires evaluation of the decision-makers’ capabilities and the selection of the appropriate aggregation rule. The major and so far unresolved difficulty is the former necessity. This article presents the optimal aggregation rule that simultan...
Article
Full-text available
Given the judgments of multiple voters regarding some issue, it is generally assumed that the best way to arrive at some collective judgment is by following the majority. We consider here the now common case in which each voter expresses some (binary) judgment regarding each of a multiplicity of independent issues and assume that each voter has som...
Conference Paper
Full-text available
While it is has often been observed that the product of translation is somehow different than non-translated text, scholars have emphasized two distinct bases for such differences. Some have noted interference from the source language spilling over into translation in a source-language-specific way, while others have noted general effects of the pr...
Article
Full-text available
In this paper we introduce a novel method for automatically tuning the search parameters of a chess program using genetic algorithms. Our results show that a large set of parameter values can be learned automatically, such that the resulting performance is comparable with that of manually tuned parameters of top tournament-playing chess programs.
Article
Full-text available
In this paper we introduce a novel method for automatically tuning the search parameters of a chess program using genetic algorithms (GA). Our results show that a large set of parameter values can be learned automatically, such that the resulting performance is comparable with that of manually tuned parameters of top tournament-playing chess progra...
Article
Full-text available
The computational analysis of the style of natural language texts, computational stylistics, seeks to develop automated methods to (1) effectively distinguish texts with one stylistic character from those of another, and (2) give a meaningful representation of the differences between textual styles. Such methods have many potential applications in...
Article
Full-text available
The main aim of this paper is to study the power of legislators in the Lower House of the Czech Parliament in 1996–2004 with respect to power distribution and its uncertainty. A discrepancy between a-priori computed power indices and outcome of voting leads to necessity to reveal the possible source of uncertainty. This paper studies uncertainty in...
Article
In certain judgmental situations where a “correct” decision is presumed to exist, optimal decision making requires evaluation of the decision-maker's capabilities and the selection of the appropriate aggregation rule. The major and so far unresolved difficulty is the former necessity. This paper presents the optimal aggregation rule that simultaneo...
Article
Prominent formal thought disorder, expressed as unusual language in speech and writing, is often a central feature of Schizophrenia. Since a more comprehensive understanding of phenomenology surrounding thought disorder is needed, this study investigates these processes by examining writing in Schizophrenia by novel computer-aided analysis. Thirty-...
Article
Full-text available
The measurement of disproportionality, volatility and malapportionment often employ similar indices. Yet the debate on the issue of adequate measurement has remained open. We offer a formal and rigorous list of properties that roughly subsume those of Taagepera and Grofman (Party Polit 9(6):659–677, 2003). One of these properties, Dalton’s principl...
Article
Full-text available
Authorship profiling problem is of growing importance in the global information environment, and can help police identify characteristics of the perpetrator of a crime when there are specific suspects to consider. The approach is to apply machine learning to text categorization, for which the corpus of training documents, each labeled according to...
Article
Full-text available
Statistical authorship attribution has a long history, culminating in the use of modern machine learning classification methods. Nevertheless, most of this work suffers from the limitation of assuming a small closed set of candidate authors and essentially unlimited training text for each. Real-life authorship attribution problems, however, typical...
Conference Paper
Full-text available
This paper demonstrates the use of genetic algorithms for evolving a grandmaster-level evaluation function for a chess program. This is achieved by combining supervised and unsupervised learning. In the supervised learning phase the organisms are evolved to mimic the behavior of human grandmasters, and in the unsupervised learning phase these evolv...
Conference Paper
Full-text available
We show how an Arabic language religious-political document can be automatically classified according to the ideological stream and organizational affiliation that it represents. Tests show that our methods achieve near-perfect accuracy.
Conference Paper
Full-text available
In this paper we demonstrate how genetic algorithms can be used to reverse engineer an evaluation function's param- eters for computer chess. Our results show that using an appropriate mentor, we can evolve a program that is on par with top tournament-playing chess programs, outperforming a two-time World Computer Chess Champion. This perfor- mance...
Article
Goal of the workshop was to bring together experts and prospective researchers around the exciting and future-oriented topic of plagiarism analysis, authorship identification, and high similarity search. This topic receives increasing attention, which results, among others, from the fact that information about nearly any subject can be found on the...
Article
The growth of the blogosphere offers an unprecedented opportunity to study language and how people use it on a large scale. We present an analysis of over 140 million words of English text drawn from the blogosphere, exploring if and how age and gender affect writing style and topic. Our primary result is that a number of stylistic and content-base...
Article
Full-text available
This paper proposes a method for automatic correction of bias in speaker recognition systems, especially fusion-based systems. The method is based on a post-classifier which learns the relative performance obtained by the constituent systems in key trials, given the training and testing conditions in which they occurred. These conditions generally...
Conference Paper
Full-text available
This paper presents a simplified post-classificatio n framework for enhancing the performance of a given speaker re cognition classifier by means of other "auxiliary" classifier s. We call it Virtual Fusion , since the assisting classifiers are used only for training the post-classifier and are not necessary in operating mode. Experiments performed...
Article
Full-text available
In the authorship verification problem, we are given examples of the writing of a single author and are asked to determine if given long texts were or were not written by this author. We present a new learning-based method for adducing the "depth of difference" between two example sets and offer evidence that this method solves the authorship verif...
Conference Paper
Full-text available
We present a web mining method for discov- ering and enhancing relationships in which a specified concept (word class) participates. We discover a whole range of relationships focused on the given concept, rather than generic known relationships as in most pre- vious work. Our method is based on cluster- ing patterns that contain concept words and...
Conference Paper
Full-text available
In this paper we present a general machine learning framework for score bias reduction and analysis in speaker recognition systems. The general principle is to learn a meta-system using recognition systems' errors, given the training and testing conditions in which they occurred. In the context of speaker recognition, the proposed method is able to...
Article
We introduce a new measure on linguistic features, called stability, which captures the extent to which language element, such as a word or a syntactic construct, is replaceable by semantically equivalent elemen This measure may be perceived as quantifying the degree of available "synonymy" for a language item. W show that frequent but unstable fea...
Article
Full-text available
Most research on learning to identify sentiment ignores “neutral” examples, learning only from examples of significant (positive or negative) polarity. We show that it is crucial to use neutral examples in learning polarity for a variety of reasons. Learning from negative and positive examples alone will not permit accurate classification of neutra...
Conference Paper
Full-text available
Analysis of a corpus of tens of thousands of blogs - incorporating close to 300 million words - indicates significant differences in writing style and content between male and female bloggers as well as among authors of different ages. Such differences can be exploited to determine an unknown author's age and gender on the basis of a blog's vocabul...
Conference Paper
Full-text available
In this paper, we use a blog corpus to demonstrate that we can often identify the author of an anonymous text even where there are many thousands of candidate authors. Our approach combines standard information retrieval methods with a text categorization meta-learning scheme that determines when to even venture a guess.