Prof. Dr. Rainer Gemulla

Chair of Practical Computer Science I: Data Analytics

Universität Mannheim
B6, 26, Room B 016
D-68159 Mannheim

Tel.: +49 621 181 2480

rgemulla uni-mannheim.de
My PGP public key (id 0x81405E0B30302532)

I am heading the Chair of Practical Computer Science I: Data Analytics at the University of Mannheim. The chair is part of the Data and Web Science Group.

Go to: R esearch Interests, CV, PhD Students, Teaching, Awards, Professional Activities, Data and Software, Publications

There is currently an opening for a PhD position in our lab. If you consider applying to our lab, please read:

Applications should include CV, transcripts, and a short (!) cover letter or will be ignored.
We generally do not offer short interships (3 months or less). Applications for such internships will be ignored.
If you are a BSc or MSc student here, have very good transcripts, and are interested in a student job with us, contact me directly.

News

Paper accepted in ECML-PKDD 2022: Start Small, Think Big: On Hyperparameter Optimization for Large-Scale Knowledge Graph Embeddings

The paper “Start Small, Think Big: On Hyperparameter Optimization for Large-Scale Knowledge Graph Embeddings” by Adrian Kochsiek, Fritz Niesel, and Rainer Gemulla has been accepted at the 2022 ECML-PKDD European Conference on Machine Learning and Principles and Practice of Knowledge Discovery in ...

Paper accepted in SIGMOD 2022: NuPS: A Parameter Server for Machine Learning with Non-Uniform Parameter Access

The paper “NuPS: A Parameter Server for Machine Learning with Non-Uniform Parameter Access” by Alexander Renz-Wieland, Rainer Gemulla, Zoi Kaoudi, and Volker Markl has been accepted at the 2022 ACM SIGMOD International Conference on Management of Data. Abstract: Parameter servers (PSs) ...

Paper accepted in PVLDB 2022: Parallel Training of Knowledge Graph Embedding Models: A Comparison of Techniques

The paper “Parallel Training of Knowledge Graph Embedding Models: A Comparison of Techniques” by Adrian Kochsiek and Rainer Gemulla has been accepted at the 2022 Proceedings of the VLDB Endowment (PVLDB). Abstract: Knowledge graph embedding (KGE) models represent the entities and relations of a ...

Paper accepted in PVLDB 2020: Dynamic Parameter Allocation in Parameter Servers

The paper “Dynamic Parameter Allocation in Parameter Servers” by Alexander Renz-Wieland, Rainer Gemulla, Steffen Zeuch and Volker Markl has been accepted at the 2020 Proceedings of the VLDB Endowment (PVLDB). Abstract: To keep up with increasing dataset sizes and model complexity, distributed ...

Research Interests

Data analysis and data mining
Text mining and information extraction
Optimization
Approximation techniques
Algorithms for modern hardware

Curriculum Vitae

Since 2014	W3-Professor for Practical Computer Science I, Universität Mannheim, Germany
2010 – 2014	Senior researcher / group leader, Max-Planck-Institut für Informatik, Saarbrücken, Germany
2008 – 2010	Postdoctoral researcher, IBM Almaden Research Center, San Jose, CA, USA
2004 – 2008	PhD in Computer Science, Technische Universität Dresden, Germany

PhD Students

Samuel Broscheit
Kiril Gashteovski
Adrian Kochsiek
Daniel Ruffinelli
Alexander Renz-Wieland (external; cosupervision with Volker Markl)

Former PhD students

Kaustubh Beedkar, Luciano del Corro, Stefan Kain, Faraz Makari Manshadi, Christina Teflioudi, Yanjie Wang

Teaching

If you are interested in writing a seminar, Bachelor or Master thesis with us, please read the following guidelines.

Upcoming semester (HWS 2022)

Current semester (FSS 2022)

CS 303: Praktische Informatik II (Bachelor course)
IE 678: Deep Learning (Master course)
CS 707: Data and Web Science Seminar (Master seminar)
Team project: Knowledge, Questions and Transformers (Master)
Team project: Data Analytics Team Project – Your Project, Your Team (Master)
Colloquium (for PhD candidates)

Previous semester (HWS 2021)

CS 560: Large-Scale Data Management (Master Course)
IE 675b: Machine Learning (Master course)
SM 445/CS 707: Data and Web Science Seminar (Bachelor / Master seminar)
Colloquium (for PhD candidates)

Awards

Outstanding Reviewer Award at NeurIPS, 2021
Named Distinguished PC Member for SIGMOD, 2017
Junior-Fellow of the Gesellschaft für Informatik (GI), 2013
AWS in Education Research Grant Award, 2013
Busy Beaver teaching award (winter term 2012/2013)
_{for Non-Traditional Data Management (NoSQL and more)}
IBM's 2011 Pat Goldberg Memorial best paper award in CS, EE and Math
_{(for “Large-Scale Matrix Factorization with Distributed Stochastic Gradient Descent” with P. J. Haas, E. Nijkamp, and Y. Sismanis; KDD 2011)}
Best paper of NIPS 2011 Biglearn workshop
_{(for “Large-Scale Matrix Factorization with Distributed Stochastic Gradient Descent” with P. J. Haas, Y. Sismanis, C. Teflioudi, and F. Makari)}
Google Focused Research Award 2011: Robust and Scalable Fact Discovery from Web Sources
_{(with G. Weikum and M. Theobald)}
Research Highlight in Communications of the ACM
_{(for “Distinct-Value Synopses for Multiset Operations” with K. Beyer, P.J. Haas, B. Reinwald, Y. Sismanis)}
The VLDB Journal, Special Issue: Best Papers of VLDB 2006
_{(for “A Dip in the Reservoir: Maintaining Sample Synopses of Evolving Datasets” with W. Lehner and P.J. Haas)}

Professional Activities

Associate editor / area chair

VLDB: 2021, 2019, 2015
TKDE: 2015–2018
DASP: 2018
EDBT: 2017
JISA: 2016
CIKM: 2014

PC member / reviewer (since 2011)

2022: EDBT, IJCAI, ICLR, SDM, SIGMOD
2021: DEEM, EDBT, ICDM, IJCAI, KDML, NeurIPS, SIGMOD (demo), Repl4NLP
2020: AKBC, EDBT, IJCAI, LWDA, Repl4NLP, SUM, TPDS
2019: AKBC, BTW, DEEM, IJCAI, INFORMATIK, LWDA, SUM
2018: VLDB, EDBT, DEEM
2017: SIGMOD, BTW, DEEM, TALG, VLDB, ECML-PKDD
2016: SIGMOD, ECML-PKDD
2015: BTW, DAMI, GvDB, IS, JODS, JWS, PODS
2014: BDDC, BigData, Buda, DMC, JMLR, SIGMOD, VLDB
2013: AKBC, BigData, BTW, CIKM, DMC, ICALP, TKDE, TML, VLDB
2012: KDD, JMLR, TODS
2011: BTW, IS, VLDB, VLDBJ

Organizer

LWDA 2018 conference
GI Dagstuhl-Seminar: Informatik@Schule 2016 – Das Verhältnis von informatischer Bildung und “Digitaler Bildung” (2016)
GI Dagstuhl-Seminar: Informatik@Schule – Agenda für informatische Bildung in der Schule (2014)

Data and Software

Lapse: A parameter server with dynamic parameter allocation
LibKGE: A knowledge graph embedding library
OPIEC: An open information extraction corpus
MinIE: Open information extractor (spiritual successor to ClausIE)
DSGDpp: Various parallel algorithms for matrix factorization (including DSGD++)
DESQ: Frequent sequence mining with subsequence constraints
Rounding rank: algorithms for computing rounding-rank decompositions
CORE: Context-aware open relation extraction with factorization machines
FINET: Context-aware fine-grained named entity typing
Werdy: Recognition and Disambiguation of Verbs and Verb Phrases with Syntactic and Semantic Pruning
ClausIE: Clause-Based Open Information Extraction
LEMP: Fast Retrieval of Large Entries in a Matrix Product
LASH: Large-Scale Sequence Mining with Hierarchies
MG-FSM: Large-Scale Frequent Sequence Mining

Publications

See also Google Scholar and DBLP.

2022	A. Kochsiek, F. Niesel, R. Gemulla Start Small, Think Big: On Hyperparameter Optimization for Large-Scale Knowledge Graph Embeddings [pdf, resources] To appear in ECML-PKDD, 2022
	A. Saxena, A. Kochsiek, R. Gemulla Sequence-to-Sequence Knowledge Graph Completion and Question Answering [pdf, resources] In ACL, pp. 2814–2828, 2022
	A. Renz-Wieland, R. Gemulla, Z. Kaoudi, V. Markl NuPS: A Parameter Server for Machine Learning with Non-Uniform Parameter Access [pdf, source code] In SIGMOD, pp. 481–495, 2022
2021	A. Kochsiek, R. Gemulla Parallel Training of Knowledge Graph Embedding Models: A Comparison of Techniques [pdf, resources] In PVLDB, 15(3), 2021
	A. Renz-Wieland, T. Drobisch, R. Gemulla, Z. Kaoudi, V. Markl Just Move It! Dynamic Parameter Allocation in Action [pdf, demo] In PVLDB (demo), 14(12), 2021.
2020	A. Renz-Wieland, R. Gemulla, S. Zeuch, V. Markl Dynamic Parameter Allocation in Parameter Servers [pdf, source code] In PVLDB, 13(12), pp. 1877–1890, 2020
	S. Broscheit, K. Gashteovski, Y. Wang, Rainer Gemulla Can We Predict New Facts with Open Knowledge Graph Embeddings? A Benchmark for Open Link Prediction [pdf, resources] In ACL, 2020
	D. Ruffinelli, S. Broscheit, R. Gemulla You CAN Teach an Old Dog New Tricks! On Training Knowledge Graph Embeddings [pdf, video, resources, OpenReview] In ICLR, 2020
	S. Broscheit, D. Ruffinelli, A. Kochsiek, P. Betz, R. Gemulla LibKGE – A knowledge graph embedding library for reproducible research [pdf, source] In EMNLP (demo), 2020
	K. Gashteovski, R. Gemulla, B. Kotnis, S. Hertling, C. Meilicke On Aligning OpenIE Extractions with Knowledge Bases: A Case Study [pdf, slides, resources] In Eval4NLP, 2020
2019	Y. Wang, D. Ruffinelli, R. Gemulla, S. Broscheit, C. Meilicke On Evaluating Embedding Models for Knowledge Base Completion [pdf] In RepL4NLP workshop, 2019
	K. Beedkar, R. Gemulla, W. Martens A Unified Framework for Frequent Sequence Mining with Subsequence Constraints [pdf (journal version), pdf (author version), resources] In TODS, 2019
	K. Gashteovski, S. Wanner, S. Hertling, S. Broscheit, R. Gemulla OPIEC: An Open Information Extraction Corpus [pdf, poster, resources, OpenReview] In AKBC, 2019
	A. Renz-Wieland, M. Bertsch, R. Gemulla Scalable Frequent Sequence Mining With Flexible Subsequence Constraints [pdf, poster] In ICDE, 2019
Preprints (2019)	Y. Wang, S. Broscheit, R. Gemulla A Relational Tucker Decomposition for Multi-Relational Link Prediction [arXiv] 2019
2018	C. Meilicke, M. Fink, Y. Wang, D. Ruffinelli, R. Gemulla, and H. Stuckenschmidt Fine-grained Evaluation of Rule- and Embedding-based Systems for Knowledge Graph Completion [pdf, resources] In ISWC, 2018
	J. Pfeiffer, S. Broscheit, R. Gemulla, M. Göschl A Neural Autoencoder Approach for Document Ranking and Query Refinement in Pharmacogenomic Information Retrieval [pdf] In BioNLP workshop, 2018
	S. Broscheit, R. Gemulla, M. Keuper Learning Distributional Token Representations from Visual Features [pdf] In RepL4NLP workshop, 2018
	Y. Wang, R. Gemulla, H. Li On Multi-Relational Link Prediction with Bilinear Models [pdf, resources] In AAAI, 2018
2017	K. Gashteovski, R. Gemulla, L. del Corro MinIE: Minimizing Facts in Open Information Extraction [pdf, poster, resources] In EMNLP, pp. 2620–2630, 2017
	C. Teflioudi, R. Gemulla Exact and Approximate Maximum Inner Product Search with LEMP [pdf (journal version), pdf (author version), resources] In TODS, 42(1) Art. 5, 2017
2016	S. Neumann, R. Gemulla, P. Miettinen What You Will Gain By Rounding: Theory and Algorithms for Rounding Rank [pdf, tech report, resources] In ICDM, pp. 380–389, 2016
	K. Beedkar, R. Gemulla DESQ: Frequent Sequence Mining with Subsequence Constraints [pdf, tech report, resources] In ICDM (short paper), pp. 793–798, 2016
2015	L. Del Corro, A. Abujabal, R. Gemulla, G. Weikum FINET: Context-Aware Fine-Grained Named Entity Typing [pdf, slides, resources] In EMNLP, pp. 868–878, 2015
	F. Petroni, L. Del Corro, R. Gemulla CORE: Context-Aware Open Relation Extraction with Factorization Machines [pdf, slides, resources] In EMNLP, pp. 1763–1773, 2015
	K. Beedkar, K. Berberich, R. Gemulla, I. Miliaraki Closing the Gap: Sequence Mining at Scale [pdf (journal version), pdf (author version), resources] In TODS, 40(2) Art. 8, 2015
	C. Teflioudi, R. Gemulla, O. Mykytiuk LEMP: Fast Retrieval of Large Entries in a Matrix Product [pdf, slides, resources] In SIGMOD, pp. 107–122, 2015
	K. Beedkar, R. Gemulla LASH: Large-Scale Sequence Mining with Hierarchies [pdf, slides, source code] In SIGMOD, pp. 491–503, 2015
	R. Gemulla A Self-Portrayal of GI Junior Fellow Rainer Gemulla: Data Analysis at Scale [pdf (journal version), pdf (author version)] it – Information Technology 57(2), pp. 130–132 , 2015
2014	L. Del Corro, R. Gemulla, G. Weikum Werdy: Recognition and Disambiguation of Verbs and Verb Phrases with Syntactic and Semantic Pruning [pdf, resources] In EMNLP, pp. 374–385, 2014
	P. Roy, J. Teubner, R. Gemulla Low-Latency Handshake Join [pdf] In PVLDB, 7(9), pp. 709–720, 2014
	L. Qu, Y. Zhang, R. Wang, L. Jiang, R. Gemulla, G. Weikum Senti-LSSVM: Sentiment-Oriented Multi-Relation Extraction with Latent Structural SVM [pdf] In TACL, 2, pp. 155–168, 2014
	D. Erdös, R. Gemulla, E. Terzi Reconstructing Graphs from Neighborhood Data [pdf (author version), pdf (journal version)] In TKDD, 8(4), 2014
2013	F. Makari, C. Teflioudi, R. Gemulla, P. J. Haas, Y. Sismanis Shared-Memory and Shared-Nothing Stochastic Gradient Descent Algorithms for Matrix Completion [pdf (author version), pdf (journal version), source code] In KAIS (special issue: best papers of ICDM 2012), pp. 1–31, 2013
	F. Makari, R. Gemulla A Distributed Approximation Algorithm for Mixed Packing-Covering Linear Programs [pdf] In NIPS 2013 Biglearn workshop (poster), 2013
	F. Makari, B. Awerbuch, R. Gemulla, R. Khandekar, J. Mestre, M. Sozio A Distributed Algorithm for Large-Scale Generalized Matching [pdf, slides] The analysis of the number of binary search steps (Lemma 2) contains a bug; see our Biglearn paper for a corrected version. In PVLDB, 6(9), pp. 613–624, 2013
	I. Miliaraki, K. Berberich, R. Gemulla, S. Zoupanos Mind the Gap: Large-Scale Frequent Sequence Mining [pdf, slides, resources] In SIGMOD, pp. 797–808, 2013
	L. Del Corro, R. Gemulla ClausIE: Clause-Based Open Information Extraction [pdf, slides, resources] In WWW, pp. 355–366, 2013
	R. Gemulla, P. J. Haas, W. Lehner Non-Uniformity Issues and Workarounds in Bounded-Size Sampling [pdf (author version), pdf (journal version), source code] In The VLDB Journal, 22(6), pp. 753–772, 2013
	K. Beedkar, L. Del Corro, R. Gemulla Fully Parallel Inference in Markov Logic Networks [pdf] In BTW, pp. 205–224, 2013
2012	D. Erdös, R. Gemulla, E. Terzi Reconstructing Graphs from Neighborhood Data [pdf, slides] In ICDM, pp. 231–240, 2012
	C. Teflioudi, F. Makari, R. Gemulla Distributed Matrix Completion [pdf, slides, source code] In ICDM, pp. 655–664, 2012
	L. Qu, R. Gemulla, G. Weikum A Weakly Supervised Model for Sentence-Level Semantic Orientation Analysis with Multiple Experts [pdf] In EMNLP-CoNLL, pp. 149–159, 2012
2011	R. Gemulla, P. J. Haas, Y. Sismanis, C. Teflioudi, F. Makari Large-Scale Matrix Factorization with Distributed Stochastic Gradient Descent [pdf, slides, source code] In NIPS 2011 Biglearn workshop, 2011 (best paper award)
	R. Gemulla, E. Nijkamp, P. J. Haas, Y. Sismanis Large-Scale Matrix Factorization with Distributed Stochastic Gradient Descent [pdf, slides, source code] In KDD, pp. 69–77, 2011
	K. Beyer, V. Ercegovac, R. Gemulla, A. Balmin, M. Eltabakh, C.C. Kanne, F. Ozcan, E. Shekita Jaql: A Scripting Language for Large Scale Semistructured Data Analysis [pdf] In PVLDB (industrial track), 4(11), pp. 1272–1283, 2011
	M. Y. Eltabakh, Y. Tian, F. Özcan, R. Gemulla, A. Krettek, J. McPherson CoHadoop: Flexible Data Placement and Its Exploitation in Hadoop [pdf] In PVLDB, 4(9), pp. 575–585, 2011
	R. Gemulla, P. J. Haas, E. Nijkamp, Y. Sismanis Large-Scale Matrix Factorization with Distributed Stochastic Gradient Descent [pdf] IBM Research Report RJ10481, March 2011 Revised February, 2013
	B. Schlegel, R. Gemulla, W. Lehner Memory-Efficient Frequent-Itemset Mining [pdf] In EDBT, pp. 461–472, 2011
2010	S. Das, Y. Sismanis, K. S. Beyer, R. Gemulla, P. J. Haas, J. McPherson. Ricardo: Integrating R and Hadoop [pdf] In SIGMOD (industrial track), pp. 987–998, 2010
	B. Schlegel, R. Gemulla, W. Lehner. Fast Integer Compression using SIMD Instructions [pdf] In DAMON, pp. 34–40, 2010
2009	K. Beyer, R. Gemulla. P. J. Haas, B. Reinwald, Y. Sismanis. Distinct-Value Synopses for Multiset Operations [pdf, technical perspective by Surajit Chaudhuri] In Commun. ACM, 52(10), pp. 87–95, 2009
	B. Schlegel, R. Gemulla, W. Lehner. k-Ary Search on Modern Processors [pdf, slides] In DAMON, pp. 52–60, 2009
2008	R. Gemulla. Sampling Algorithms for Evolving Datasets [pdf, summary, slides] Ph.D. thesis, Technische Universität Dresden, 2009 URL for citations: nbn-resolving.de/urn:nbn:de:bsz:14-ds-1224861856184–11644
	R. Gemulla, P. Rösch and W. Lehner. Linked Bernoulli Synopses: Sampling Along Foreign Keys [pdf, slides] In SSDBM, pp. 6–23, 2008
	R. Gemulla and W. Lehner. Sampling Time-Based Sliding Windows in Bounded Space [pdf, slides] As observed by Hu et al., the lower bound of Ω(k log N) stated in Theorem 1 should read Ω(k log(N/k)). In SIGMOD, pp. 379–392, 2008
	P. Rösch, R. Gemulla and W. Lehner. Designing Random Sample Synopses with Outliers [pdf, poster] In ICDE (poster), pp. 1400–1402, 2008
2007	R. Gemulla, W. Lehner and P.J. Haas. Maintaining Bounded-Size Sample Synopses of Evolving Datasets [pdf] The resizing algorithm proposed in this article contains a bug; see my Ph.D. thesis or our 2013 VLDB Journal paper for a corrected version. In The VLDB Journal, Special Issue: Best Papers of VLDB 2006, pp. 173–201, 2007
	K. Beyer, P. J. Haas, B. Reinwald, Y. Sismanis and R. Gemulla. On Synopses for Distinct-Value Estimation Under Multiset Operations [pdf, slides] In SIGMOD, pp. 199–210, 2007
	R. Gemulla, W. Lehner and P. J. Haas. Maintaining Bernoulli Samples over Evolving Multisets [pdf, slides] In PODS, pp. 93–102, 2007
2006	R. Gemulla, W. Lehner and P. J. Haas. A Dip in the Reservoir: Maintaining Sample Synopses of Evolving Datasets [pdf, slides] In VLDB, pp. 595–606, 2006
	A. Klein, R. Gemulla, P. Rösch and W. Lehner. Derby/S: A DBMS for Sample-Based Query Answering [pdf, poster1, poster2] In SIGMOD (demo), pp. 757–759, 2006
	R. Gemulla and W. Lehner. Deferred Maintenance of Disk-Based Random Samples [pdf, slides] In EDBT, pp. 423–441, 2006

Kontakt

Prof. Dr. Rainer Gemulla

Chair of Practical Computer Science I: Data Analytics

University of Mannheim
School of Business Informatics and Mathematics
B 6, 26 – Room B 0.16
68159 Mannheim

Phone: +49 621 181–2480
E-mail: rgemullauni-mannheim.de
Web: www.uni-mannheim.de/dws/people/professors/prof-dr-rainer-gemulla

Photo credit: Leonie Kopetzki