About Me

I am research scientist at Accenture Labs Dublin. My research interests span knowledge graphs management, machine learning for relational data, and knowledge graphs applications. I obtained a PhD in computer science from the University of Nice Sophia Antipolis, during my stint at the French Institute for Research in Computer Science (Inria), where I worked on context-aware access to Linked Data in the Wimmics team.

Research Interests

Knowledge Graph Mining

  • Statistical Relational Learning
  • Embedding Models for Knowledge Graph Completion
  • Representation Learning for Knowledge Graphs
  • Machine Learning and Data Mining Methods for the Semantic Web
  • Data mining and Knowledge Discovery in Linked Data

Linked Data and Semantic Web

  • Knowledge Graph Lifecyle Management
  • Management of Semantic Web Data and Linked Data
  • Access Control and Privacy in Semantic Data
  • Semantic technologies for Mobile Platforms


  • Traffic Analytics for Linked Data

    A traffic analytics platform for servers that publish Linked Data.

    A service that mines access logs of registered Linked Data servers and extracts Linked Data-specific traffic metrics providing insights not available in traditional web analytics tools.


    Context-Aware Presentation Layer for Linked Data

    PRISSMA is a Linked Data rendering engine that selects the most appropriate RDF presentation according to mobile context, using graph edit distance to compute error-tolerant subgraph isomorphisms between context graphs.

  • Shi3ld

    Context-Aware Authorization for Graph Stores

    Shi3ld is an access control (authorization) module for triple stores. Shi3ld protects SPARQL queries and HTTP operations on Linked Data.

  • Linked Data Spam Dataset

    An annotated RDF dataset polluted by syntethic malicious triples. Useful to train and test Linked Data spam filters.


Research Scientist

Oct 2017 - Present
Accenture Labs, Dublin, Ireland

Research Scientist

2014 - Sep 2017
Fujitsu Ireland, Galway, Ireland
  • Designed and applied scalable embedding models for knowledge graph completion in various industry scenarios.
  • Designed a scalable HBase-backed traffic analytics platform for Linked Data.
  • Conceived a supervised anti-spam filter for knowledge graphs.
  • Designed and developed a query mediator for polyglot and distributed data tiers.

PhD Student

2010 - 2013
Inria - WIMMICS Team, Sophia Antipolis, France
  • PhD Thesis: "Context-Aware Access Control and Presentation of Linked Data". Co-supervised by Fabien Gandon and Ivan Herman.
  • Designed a context-aware access control framework for triple stores.
  • Adapted an $O(n)$ with $n$ compared graphs error-tolerant matching algorithm to RDF.
  • Designed a presentation layer for RDF that adapts rendering to mobile context.

Software Engineer

GFI Informatique, Sophia Antipolis, France
  • Maintained production backend Java code base at Amadeus S.A.
  • Collaborated with product managers, UX specialists, and QA.

Research Engineer

2007 - 2010
Telecom Italia - TILab, Turin, Italy
  • Cluster analysis on mobile users location data to summarize mobility patterns and predict habits.
  • Designed and implemented back end Java infrastructure for location-based mobile services.
  • Collaborated in mining user-generated content on mobile users photo-sharing portal.
  • Applied off-the-shelf topic modeling algorithms to extract tags from user-generated content.



P. Minervini, L. Costabello, E. Munoz, V. Novacek and P.Y Vandenbussche Regularizing Knowledge Graph Embeddings via Equivalence and Inversion Axioms. ECML PKDD, 2017.

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L. Costabello, P.Y Vandenbussche, G. Shukair, C. Deliot, and N. Wilson: Traffic Analytics for Linked Data Publishers. 14th Extended Semantic Web Conference (ESWC), 2017.

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L. Costabello. Error-Tolerant RDF Subgraph Matching for Adaptive Presentation of Linked Data on Mobile. 11th Extended Semantic Web Conference (ESWC), 2014.

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L. Costabello, S. Villata. O. Rodriguez-Rocha and F. Gandon. Access Control for HTTP Operations on Linked Data. 10th Extended Semantic Web Conference (ESWC), 2013.

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L. Costabello, S. Villata and F. Gandon. Context-Aware Access Control for RDF Graph Stores. 20th European Conference on Artificial Intelligence (ECAI 2012), 2012.

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L. Costabello and F. Gandon. Context-Aware Presentation of Linked Data on Mobile. International Journal On Semantic Web and Information Systems (IJSWIS), Vol. 10(4), 2014.

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S. Villata, L. Costabello, N. Delaforge and F. Gandon. A Social Semantic Web Access Control Model. Journal on Data Semantics (JoDS), Vol. 2(1) Springer, 2013.

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P. Falcarin, O. Rodriguez-Rocha, L. Costabello, and L.W. Goix. Leveraging Context for Social Media Mobile Services. IEEE Pervasive Computing, Vol. 7 (4), Work-in-Progress section, 2008.

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Book Chapters

S. Villata, L. Costabello, F. Gandon, C. Faron-Zucker, M. Buffa. Social Semantic Network-based Access Control. Chapter in Security and Privacy Preserving in Social Networks, Series: Lecture Notes in Social Networks. Chbeir, Richard and Al Bouna, Bechara (Eds.), Springer, 2013.

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L. Costabello. Context-Aware Access Control and Presentation for Linked Data, PhD Thesis, 2013.

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Posters, Demos,
Doctoral Consortiums

L. Costabello, P.Y Vandenbussche, G. Shukair, C. Deliot, and N. Wilson: Access Logs Don't Lie: Towards Traffic Analytics for Linked Data Publishers. ISWC, Demo session, 2016.

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L. Costabello, F. Gandon. Error-Tolerant RDF Subgraph Matching for Adaptive Presentation of Linked Data on Mobile. WWW, Poster session, 2014.

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L. Costabello, S. Villata, I. Vagliano, and F. Gandon. Assisted Policy Management for SPARQL Endpoints Access Control. 12th International Semantic Web Conference (ISWC), Demo session, 2013.

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L. Costabello, S. Villata, N. Delaforge and F. Gandon. SHI3LD: an Access Control Framework for the Mobile Web of Data. 23rd ACM Conference on Hypertext and Social Media (HYPERTEXT 2012), Poster Session, 2012.

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L. Costabello, S. Villata, N. Delaforge and F. Gandon. Ubiquitous Access Control for SPARQL Endpoints: Lessons Learned and Future Challenges. WWW, Poster session, 2012.

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L. Costabello. PRISSMA, Towards Mobile Adaptive Presentation of the Web of Data. Doctoral Consortium of the 10th International Semantic Web Conference, ISWC, Bonn, 2011.

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L. Costabello, O. Rodriguez Rocha and L.W. Goix. Sharing Mobile User Experiences with Context-Based Mashups. Mobiquitous, Dublin, 2008.

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A.L. Gentile, M. Acosta, L. Costabello, A.G. Nuzzolese, V. Presutti, and D. Reforgiato. Conference Live: Accessible and Sociable Conference Semantic Data. Semantics, Analytics, Visualisation: Enhancing Scholarly Data Workshop (SAVE-SD), WWW, 2015.

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E. Muñoz, L. Costabello, and PY Vandenbussche. µRaptor: A DOM-based System with Appetite for hCard Elements. 2nd Workshop on Linked Data for Information Extraction (LD4IE), ISWC, 2014.

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A. Hasnain, M. Al-Bakri, L. Costabello, Z. Cong, I. Davis and T. Heath. Spamming in Linked Data. 3rd International Workshop on Consuming Linked Data (COLD2012), ISWC, 2012.

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L. Costabello, S. Villata, N. Delaforge and F. Gandon. Linked Data Access Goes Mobile: Context-Aware Authorization for Graph Stores. 5th Linked Data on the Web Workshop (LDOW2012), WWW, 2012.

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L. Costabello and L.W Goix. Time-Based Cluster Analysis for Automatic Blog Generation. Workshop on Social Web Search and Mining - WWW, 2008.

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