Roi Reichart's Homepage


Contact Information

e-mail:

roiri at csail dot mit dot edu
roiri at cs dot huji dot ac dot il

My research statement and CV.

Research

I am 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.

My main research interests are: (1) Semi-supervised methods for statistical parsing including self-training, active learning, ensemble methods and confidence estimation. (2) Unsupervised grammar induction. (3) Clustering problems in NLP and their evaluation. (4) Application of statistical parsing to semantic tasks (e.g. argument identification, VerbNet classes disambiguation and concept and relations acquisition), especially in an unsupervised manner.

I have collaborated and written papers with: (1) Omri Abend ; (2) the Cognitive Computation Group (CCG) of the University of Illinois at Urbana-Champaign headed by Professor Dan Roth ; (3) Katrin Tomanek from the Jena University Language & Information Engineering (JULIE) Lab headed by Professor Udo Hahn; (4) Raanan Fattal ; (4) Dmitry Davidov (1975-2010) and Shulamit Umansky-Pesin from the Computational Linguistics and Natural Language Processing lab of the Hebrew University (my PhD lab).

I received the best paper award in CoNLL 2009.

Code

Clustering Evaluation Code: MATLAB code for Information-theoretic and mapping-based measures for clustering evaluation. 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).

Publications


    2012

    "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.
    "Learning to MAP into a Universal POS Tagset." Yuan Zhang, Roi Reichart, Regina Barzilay and Amir Globerson , EMNLP 2012 (full paper).
    "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). [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 ]

Courses

In 2006--2010 academic years, I have been the grader of the course Neural Networks 1 on the ICNC.
In 2009, I was the teaching assistant of the course Introduction to Artificial Intelligence of the CS school.