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Diversity by proportionality

Van Dang, W. Bruce Croft
2012 Proceedings of the 35th international ACM SIGIR conference on Research and development in information retrieval - SIGIR '12  
This paper presents a different perspective on diversity in search results: diversity by proportionality.  ...  Consequently, we propose a framework for optimizing proportionality for search result diversification, which is motivated by the problem of assigning seats to members of competing political parties.  ...  Section 3 presents our approach to proportionality and the effectiveness measure based on it. Section 4 describes in detail our proportionality-driven framework for search result diversification.  ... 
doi:10.1145/2348283.2348296 dblp:conf/sigir/DangC12 fatcat:nnv7diaylvaqpontlu7u4muhgq

History by Diversity

Jaspreet Singh, Wolfgang Nejdl, Avishek Anand
2016 Proceedings of the 2016 ACM on Conference on Human Information Interaction and Retrieval - CHIIR '16  
To support this search strategy, we introduce the notion of a Historical Query Intent to explicitly model a historian's search task and define an aspect-time diversification problem over news archives.  ...  We also present results of a qualitative user study to determine wether this drop in precision is detrimental to user experience. Our results show that users still preferred HistDiv's ranking.  ...  Problem Definition The historical search result diversification problem or simply the historical search task intends to find a re-ranking S of an initial result set Rq that has maximum coverage and minimum  ... 
doi:10.1145/2854946.2854959 dblp:conf/chiir/SinghNA16 fatcat:x7vpwfbmhrdblemcusbkgxi5sq

Diversity of the genus Lactobacillus revealed by comparative genomics of five species

C. Canchaya, M. J. Claesson, G. F. Fitzgerald, D. van Sinderen, P. W. O'Toole
2006 Microbiology  
The genus Lactobacillus contains over 80 recognized species, and is characterized by a high level of diversity, reflected in its complex phylogeny.  ...  Phylogeny based on whole-genome alignments suggested that L. salivarius was closer to L. plantarum than to L. sakei, which was closest to Enterococcus faecalis, in contrast to 16S rRNA gene relatedness  ...  ACKNOWLEDGEMENTS This research was supported by Science Foundation Ireland through a Centre for Science, Engineering and Technology award to the Alimentary Pharmabiotic Centre and by grants from the Higher  ... 
doi:10.1099/mic.0.29140-0 pmid:17074890 fatcat:qcv2sxar4ngurlsq5myhvcwlym

Sentiment diversification with different biases

Elif Aktolga, James Allan
2013 Proceedings of the 36th international ACM SIGIR conference on Research and development in information retrieval - SIGIR '13  
Since sentiment classification is an essential tool for this task, we experiment by gradually degrading the accuracy of a perfect classifier down to 40%, and show which diversification approaches prove  ...  Prior search result diversification work focuses on achieving topical variety in a ranked list, typically equally across all aspects.  ...  To what extent does it make sense to consider biases for topical diversity? For instance, with an Outlier bias-like approach underrepresented query aspects could be highlighted in search results.  ... 
doi:10.1145/2484028.2484060 dblp:conf/sigir/AktolgaA13 fatcat:3ewdu3x5dvabparhbyqek22n5u

Coverage, redundancy and size-awareness in genre diversity for recommender systems

Saúl Vargas, Linas Baltrunas, Alexandros Karatzoglou, Pablo Castells
2014 Proceedings of the 8th ACM Conference on Recommender systems - RecSys '14  
We show that methods previously proposed for measuring and enhancing recommendation diversity -including those adapted from search result diversification-fail to address adequately these three properties  ...  We also propose an efficient greedy optimization technique to optimize Binomial diversity.  ...  A third approach is the more recent proportionality framework by Dang and Croft [9] for search result diversification.  ... 
doi:10.1145/2645710.2645743 dblp:conf/recsys/VargasBKC14 fatcat:cvryyozhcngcrmpjmxqo3odgai

Diverse and Proportional Size-l Object Summaries for Keyword Search

Georgios Fakas, Zhi Cai, Nikos Mamoulis
2015 Proceedings of the 2015 ACM SIGMOD International Conference on Management of Data - SIGMOD '15  
We verify effectiveness by collecting user feedback, e.g. by asking DBLP authors (i.e. the DSs themselves) to evaluate our results.  ...  Given a set of keywords that can identify a Data Subject (DS), a recently proposed relational keyword search paradigm produces, as a query result, a set of Object Summaries (OSs).  ...  More precisely, in [8] an election-based method is proposed to address the problem of diversifying searched results proportionally (our work is inspired by this approach).  ... 
doi:10.1145/2723372.2737783 dblp:conf/sigmod/FakasCM15 fatcat:xedzud4y5ff77c3bacpamqg5vu

Search Result Diversification in Short Text Streams

Shangsong Liang, Emine Yilmaz, Hong Shen, Maarten De Rijke, W. Bruce Croft
2017 ACM Transactions on Information Systems  
We also propose a streaming diversification algorithm, SDA, that integrates the information captured by D2M3 with our proposed modified version of the PM-2 (Proportionality-based diversification Methodsecond  ...  We consider the problem of search result diversification for streams of short texts.  ...  Copyrights for components of this work owned by others than ACM must be honored. Abstracting with credit is permitted.  ... 
doi:10.1145/3057282 fatcat:magvfcd3xrgmxh6g35ocu3c4ba

On Measuring Bias in Online Information [article]

Evaggelia Pitoura, Panayiotis Tsaparas, Giorgos Flouris, Irini Fundulaki, Panagiotis Papadakos, Serge Abiteboul, Gerhard Weikum
2017 arXiv   pre-print
In this vision paper, we make the case for a systematic approach towards measuring bias.  ...  Bias in online information has recently become a pressing issue, with search engines, social networks and recommendation services being accused of exhibiting some form of bias.  ...  An individual-based approach to user bias assumes that it is possible to define an appropriate distance measure D u between the users in U .  ... 
arXiv:1704.05730v2 fatcat:vddalnnmuraubk2omgatgmqyjy

On Measuring Bias in Online Information

Evaggelia Pitoura, Panayiotis Tsaparas, Giorgos Flouris, Irini Fundulaki, Panagiotis Papadakos, Serge Abiteboul, Gerhard Weikum
2018 SIGMOD record  
In this vision paper, we make the case for a systematic approach towards measuring bias.  ...  Bias in online information has recently become a pressing issue, with search engines, social networks and recommendation services being accused of exhibiting some form of bias.  ...  INTRODUCTION We live in an information age where the majority of our diverse information needs are satisfied online by search engines, social networks and media, news aggregators, e-shops, vertical portals  ... 
doi:10.1145/3186549.3186553 fatcat:r4n5wlzkkjfrjapr33lhpezze4

The R&D Portfolio: A Concept for Allocating Science and Technology Funds

M. McGeary, P. M. Smith
1996 Science  
ation of unpredictal~ility, diversification is important for maximizing results.  ...  It calls for decision-makers to (i) look beyond next year's budget request; (ii) ensure diversity by providing adequate investment in each field (and, within fields, funding multiple approaches to research  ... 
doi:10.1126/science.274.5292.1484 fatcat:ieeqqagoi5bsjeloq3chiwqcy4

How Investor Portfolios Shape Regulatory Outcomes: Privatized Infrastructure After Crises

Alison E. Post, María Victoria Murillo
2016 World Development  
High reputational costs from exit encourage investors to remain following expropriation, while investors' capacity to secure compensatory policies depends on whether they possess diverse assets in the  ...  Their weak institutional environments, however, make them prone to crises that generate incentives for governments to renege on contractual commitments to investors.  ...  Model 1 involves nonproportionality for the reputational exit cost variable, but results are comparable and proportionality attained when it is interacted with the log of the number of years an investor  ... 
doi:10.1016/j.worlddev.2015.08.006 fatcat:jfbkl5jilfacvmbwgfhonelpuq

Personalised Diversification Using Intent-Aware Portfolio

Jacek Wasilewski, Neil Hurley
2017 Adjunct Publication of the 25th Conference on User Modeling, Adaptation and Personalization - UMAP '17  
A baseline recommendation is greedily re-ranked using an objective that promotes diversity across the aspects.  ...  We derive an aspect model that supports the goal of minimum variance and that is faithful to the underlying baseline algorithm.  ...  Trade-o s between the relevance and diversity are explored for di erent values of λ and α by performing a grid search.  ... 
doi:10.1145/3099023.3099067 dblp:conf/um/WasilewskiH17 fatcat:wbofzng33zf2tjuhj7uz3dp3gy

A template for scatter search and path relinking [chapter]

Fred Glover
1998 Lecture Notes in Computer Science  
Highlights of these components include new diversification generators for zero-one and permutation problems (extended by a mapping-by-objective technique that handles additional classes of problems), together  ...  The overall design can be summarized by a small number of key steps, leading to versions of scatter search and path relinking that are fully specified upon providing a handful of subroutines.  ...  The foregoing 0-1 Diversification Generator and the one first described can additionally be applied to generate solutions that differ from a set of solutions by using a TS frequency-based approach.  ... 
doi:10.1007/bfb0026589 fatcat:lcdtds7qqrfkzfe4gnzlchynhe

Best Practices For Diversifying The Faculty In The Sciences

Danielle W. Lynch
2018 Zenodo  
Guidelines and resources to support higher education faculty search committees in recruiting and hiring diverse candidates.  ...  The recommendations contained in this document are easily transferable to any type of organization.  ...  Acknowledgements The author wishes to thank Dr. Fred Davis and the College of Science Diversity and Inclusion Committee at Northeastern University.  ... 
doi:10.5281/zenodo.1306914 fatcat:ax62bzbofbdl3dl3rj3ghhnmxq

Performance evaluation of memetic approaches in 3D reconstruction of forensic objects

J. Santamaría, O. Cordón, S. Damas, J.M. García-Torres, A. Quirin
2008 Soft Computing - A Fusion of Foundations, Methodologies and Applications  
However, the image registration community tends to separate global and local searches in two different stages, named sequential hybridization approach, which is opposite to the scheme adopted by the memetic  ...  In this work, we aim to analyze the capabilities of memetic algorithms (Moscato in On evolution, search, optimization, genetic algorithms and mar-  ...  Acknowledgments We want to acknowledge all the team of the Physical Anthropology Lab at the University of Granada (headed by Dr. Botella and Dr.  ... 
doi:10.1007/s00500-008-0351-7 fatcat:ruz6klxcnnepjk63n4uhvj4ole
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