Roi Reichart's Homepage



Contact Information

I have moved. My new home page is in: http://ie.technion.ac.il/~roiri

E-MAIL: roiri at ie dot technion dot ac dot il

CV: CV

About

I am an Assistant Professor at the faculty of Industrial Engineering and Management of the Technion - Israel Institute of Technology. Before joining the Technion I was a post-doc at Anna Korhonen's lab at the computer laboratory of the University of Cambridge. Prior to this I spent two years as a post-doc at Regina Barzilay's lab at CSAIL in MIT . In June 2010 I completed my PhD at the Interdisciplinary Center for Neural Computation (ICNC) and School of Computer Science and Engineering in The Hebrew University of Jerusalem, Israel. I was a member of the Computational Linguistics and Natural Language Processing lab and my advisor was Prof. Ari Rappoport.

Research

I am interested in a variety of topics in NLP, computational linguistics and machine learning. My work is focused on tasks that require prediction of linguistic or textual structure (e.g. syntactic parsing and POS tagging, information extraction and discourse analysis). I am interested mainly in learning with little to no direct human guidance (semi-supervised and unsupervised learning) and in combining standard machine learning models with higher level expert and domain knowledge, indirect supervision, information from other modalities (visual, acoustic) etc. I am also interested in the cognitive aspects of language learning and acquisition and in their computational modeling.

Contact me if your research interests are in these or in related areas.

Code

Clustering Evaluation Code: MATLAB code for Information-theoretic and mapping-based measures for clustering evaluation (Reichart and Rappoport, CoNLL 2009). The IT-based measures are: V,VI and NVI. The mapping-based measures are two variants of greedy mapping: many-to-one and one-to-one (based on the Kuhn-Munkres algorithm).

Clustering with DPPs: MATLAB code for DPP-based hierarchical clustering (Reichart and Korhonen, ACL 2013). The algorithm achieves state-of-the-art verb clustering performance and is particularly suited for joint modeling.

Publications

2013

"Improved Lexical Acquisition through DPP-based Verb Clustering" Roi Reichart and Anna Korhonen. ACL 2013. [Paper: pdf] [Source Code: download]
"Improved Information Structure Analysis of Scientific Documents Through Discourse and Lexical Constraints." Yufan Guo, Roi Reichart and Anna Korhonen. NAACL 2013. [Paper: pdf]

2012

"Document and Corpus Level Inference For Unsupervised Learning of Information Structure of Scientific Documents." Roi Reichart and Anna Korhonen. COLING 2012 (short paper). [Paper: pdf]
"A Diverse Dirichlet Process Ensemble for Unsupervised Induction of Syntactic Categories." Roi Reichart, Gal Elidan and Ari Rappoport. COLING 2012 (full paper). [Paper: pdf]
"CRAB Reader: A Tool for Analysis and Visualization of Argumentative Zones of Scientific Literature." Yufan Guo, Ilona Solinis, Roi Reichart and Anna Korhonen. COLING 2012 (demo paper). [Paper: pdf]
"Improved Parsing and POS tagging Using Inter-Sentence Consistency Constraints." Alexander M. Rush (*) , Roi Reichart (*), Michael Collins and Amir Globerson , EMNLP 2012 (full paper). (*) - Both authors equally contributed to the paper. [Paper: pdf]
"Learning to MAP into a Universal POS Tagset." Yuan Zhang, Roi Reichart, Regina Barzilay and Amir Globerson , EMNLP 2012 (full paper). [Paper: pdf]
"Multi Event Extraction Guided by Global Constraints." Roi Reichart and Regina Barzilay , NAACL 2012 (full paper). [Paper: pdf]
"You Too?! Mixed-initiative LDA story matching to help teens in distress." , Karthik Dinakar, Birago Jones , Henri Lieberman, Rosalind W. Picard , Carolyn Rose , Matthew Thoman and Roi Reichart, International Conference on Weblog and Social Media (ICWSM) 2012.

2011

"Neutralizing Linguistically Problematic Annotations in Unsupervised Dependency Parsing Evaluation." Roy Schwartz, Omri Abend, Roi Reichart and Ari Rappoport, ACL 2011 (full paper). [Paper: pdf] [Source Code: download]
"Confidence Driven Unsupervised Semantic Parsing." Dan Goldwasser, Roi Reichart, James Clarke and Dan Roth, ACL 2011 (full paper). [Paper: pdf]
Modeling the Detection of Textual Cyberbullying , Karthik Dinakar, Roi Reichart and Henri Lieberman, International Conference on Weblog and Social Media (ICWSM) - Social Mobile Web Workshop 2011. [Paper: pdf]

2010

"Improved Fully Unsupervised Parsing with Zoomed Learning." Roi Reichart and Ari Rappoport , EMNLP 2010 (full paper). [Paper: pdf]
"Tense Sense Disambiguation: a New Task and a Supervised Algorithm." Roi Reichart and Ari Rappoport , EMNLP 2010 (full paper). [Paper: pdf]
"A Multi-Domain Web-Based Algorithm for POS Tagging of Unknown Words." Shulamit Umansky-Pesin , Roi Reichart and Ari Rappoport , COLING 2010 (full paper). [Paper: pdf]
"Improved Unsupervised POS Induction through Prototype Discovery." Omri Abend , Roi Reichart and Ari Rappoport , ACL 2010 (full paper). [Paper: pdf]
"Improved Unsupervised POS Induction Using Intrinsic Clustering Quality and a Zipfian Constraint." Roi Reichart, Raanan Fattal , and Ari Rappoport , CoNLL 2010 (full paper). [Paper: pdf]
"Type Level Clustering Evaluation: New Measures and a POS Induction Case Study." Roi Reichart (*), Omri Abend (*) , and Ari Rappoport , CoNLL 2010 (full paper). (*) - Both authors equally contributed to the paper. [Paper: pdf]

2009

"Sample Selection for Statistical Parsers: Cognitively Driven Algorithms and Evaluation Measures." Roi Reichart and Ari Rappoport , CoNLL 2009 (full paper). Receive the best paper award [Paper: pdf]
"The NVI Clustering Evaluation Measure." Roi Reichart and Ari Rappoport , CoNLL 2009 (full paper). [Paper: pdf]
"Automatic Selection of High Quality Parses Created By a Fully Unsupervised Parser." Roi Reichart and Ari Rappoport , CoNLL 2009 (full paper). [Paper: pdf]
"Superior and Efficient Fully Unsupervised Pattern-based Concept Acquisition Using an Unsupervised Parser." Dmitry Davidov , Roi Reichart and Ari Rappoport , CoNLL 2009 (full paper). [Paper: pdf]
"Unsupervised Argument Identification for Semantic Role Labeling." Omri Abend , Roi Reichart and Ari Rappoport , ACL 2009 (full paper). [Paper: pdf]

2008

"Unsupervised Induction of Labeled Parse Trees by Clustering with Syntactic Features." Roi Reichart and Ari Rappoport , COLING 2008 (full paper, oral presentation). [Paper: pdf ]
"A Supervised Algorithm for Verb Disambiguation into VerbNet Classes." Omri Abend , Roi Reichart and Ari Rappoport , COLING 2008 (full paper, oral presentation). [Paper: pdf ]
"Multi-Task Active Learning for Linguistic Annotations." Roi Reichart(*), Katrin Tomanek(*), Udo Hahn and Ari Rappoport , ACL 2008 (full paper, oral presentation). (*) - Both authors equally contributed to the paper. [Paper: pdf ]
"Extraction of Entailed Semantic Relations Through Syntax-based Comma Resolution." Vivek Srikumar, Roi Reichart, Mark Sammons, Ari Rappoport and Dan Roth , ACL 2008 (full paper, oral presentation). [Paper: pdf ]

2007

"Self-Training for Enhancement and Domain Adaptation of Statistical Parsers Trained on Small Datasets." Roi Reichart and Ari Rappoport, ACL 2007 (full paper, oral presentation). [Paper: pdf ]
"An Ensemble Method for Selection of High Quality Parses." Roi Reichart and Ari Rappoport , ACL 2007 (full paper, oral presentation). [Paper: pdf ]