Wei Xu     

[phonetic pronunciation: way shoo ]

Assistant Professor
Department of Computer Science and Engineering
The Ohio State University
   weixu@cse.ohio-state.edu
   495 Dreese Lab (2015 Neil Ave, Columbus, OH 43210)
   @cocoweixu

My research lies at the intersections of machine learning, natural language processing, and social media. I focus on designing algorithms for learning semantics from large data for natural language understanding, and generation in particular with stylistic variations. I recently received the NSF CRII Award, Criteo Faculty Research Award, CrowdFlower AI for Everyone Award, Best Paper Award at COLING'18, as well as research funds from DARPA. Previously, I was a postdoctoral researcher at the University of Pennsylvania. I received my PhD in Computer Science from New York University where I was a MacCracken Fellow, MS and BS from Tsinghua University.

I was an area chair for AAAI 2020 (NLP), ACL 2019 (semantics), NAACL 2019 (generation), EMNLP 2018 (social media), COLING 2018 (semantics), EMNLP 2016 (generation), a workshop chair for ACL 2017, and the publicity chair for EMNLP 2019, NAACL 2018 and 2016. I also created the Twitter API tutorial and a new course on Social Media and Text Analytics.

  I am looking for one or a few new PhD students every year. Here is a note to prospective students.
What's New
Teaching
CSE 5539 Social Media and Text Analytics (Autumn 2019; Autumn 2017; Autumn 2016)
CSE 5522 Artificial Intelligence II: Advanced Techniques (Autumn 2018; Spring 2018)
CSE 5525 Speech and Language Processing (Spring 2017)

Research Highlights

Natural Language Understanding / Semantics

My approach to natural language understanding is learning and modeling paraphrases on a much larger scale and with a much broader range than previous work, essentially by developing more robust machine learning models and leveraging social media data. These paraphrase can enable natural language systems to handle errors (e.g., “everytime” ↔ “every time”), lexical variations (e.g., “oscar nom’d doc” ↔ “Oscar-nominated documentary”), rare words (e.g “NetsBulls series” ↔ “Nets and Bulls games”), and language shifts (e.g. “is bananas” ↔ “is great”). We designed a series of unsupervised and supervised learning approaches for paraphrase identification in social media data (also applicable to question/answer pairs [COLING'18] for QA systems), ranging from neural network models [COLING'18] [NAACL'18a] to multi-instance learning [TACL'14] [EMNLP'16], and crowdsourcing large-scale datasets [SemEval'15] [EMNLP'17].

Natural Language Generation / Stylistics

Many text-to-text generation problems can be thought of as sentential paraphrasing or monolingual machine translation. It faces an exponential search space larger than bilingual translation, but a much smaller optimal solution space due to specific task requirements. I advocate for a text-to-text generation framework, building on top of machine translation technologies. My recent work uncovered multiple serious problems in previous research (2010 and 2014) on text simplification [TACL'15] , designed a new tunable metric SARI [TACL'16] which is effective for evaluation and as a learning objective for training (now implemented by the Google AI group in TensorFlow ), optimized syntax-based machine translation models [TACL'16], created pairwise neural ranking models to achieve new state-of-the-art performance on lexical simplification [EMNLP'18], and studied document-level simplification [AAAI'20]. I am interested in text generation for style transfer [COLING'12] and stylistics in general (e.g. historic ↔ modern, non-standard ↔ standard [BUCC'13], feminine ↔ masculine [AAAI'16]).

Publications
Students
Current Students:
    Wuwei Lan (PhD student, 2016 -- ; semantics/deep learning COLING'18 NAACL'18a EMNLP'17 )
    Mounica Maddela (PhD student, 2017 -- ; generation/neural ranking model ACL'19 EMNLP'18 )
    Chao Jiang (PhD student, 2018 -- ; semantics/crowdsourcing AAAI'20 NAACL'18)
    Yang Zhong (PhD student, 2019 -- stylistics AAAI'20 AAAI'19)
    Jeniya Tabassum (PhD student; social media/information extraction EMNLP'16 - co-advisor: Alan Ritter)
    Sydney Lee (Undergraduate, summer 2018 -- )
    Sarah Flanagan (Undergraduate, autumn 2018 -- )
    Sam Stevens (Undergraduate, autumn 2019 -- )
    Daniel Szoke (Undergraduate, autumn 2019 -- )

Former Student Advisees:
    Jim Chen (Undergraduate @UPenn; crowdsourcing HCOMP'14 TACL'16 - now PhD University of Washington)
    Ray Lei (Undergraduate @UPenn; crowdsourcing HCOMP'14 - now Microsoft Redmond)
    Mingkun Gao (Masters student @UPenn; crowdsourcing/machine translation NAACL'15 - now PhD UIUC)
    Siyu Qiu (Masters student @UPenn; semantics EMNLP'17 - now Hulu LA)
    Maria Pershina (PhD student @NYU; information extraction ACL'14 - now Goldman Sachs)
    Wenchao Du (Undergraduate @UWaterloo; dialog AAAI'17 SAP - now Master CMU LTI)
    Chaitanya Kulkarni (PhD student @OSU; robotic instructions NAACL'18b - advisor: Raghu Machiraju)
    Piyush Ghai (Masters student @OSU; semantics - now Amazon)
    Pravar Mahajan (Masters student @OSU; social media - now IBM Research Almaden)
    Rita Tong (Undergraduate @OSU - now MS student@UWisconsin-Madison)
    Lillian Chow (Undergraduate @OSU, summer 2018 -- spring 2019)
    Raleigh Potluri (Undergraduate @OSU, autumn 2018 -- summer 2019)

Professional Service
Workshop Chair:   ACL (2017)
Area Chair/Senior Area Chair:   ACL (2020, 2019), AAAI (2020), NAACL (2019), COLING (2018), EMNLP (2018, 2016)
Publicity Chair:   EMNLP (2019), NAACL (2018, 2016)
Organizer:
     - Workshop on Noisy User-generated Text (W-NUT) at ACL 2015, COLING 2016, EMNLP 2017, 2018 and 2019
     - SemEval 2015 shared-task: Paraphrases and Semantic Similarity in Twitter
     - 2016 Mid-Atlantic Student Colloquium on Speech, Language and Learning
Program Committee:
     ACL (2018, 2017, 2015, 2014, 2013), NAACL (2018, 2015), EMNLP (2017, 2016, 2015, 2014), COLING (2016, 2014)
     WWW (2016, 2015), AAAI (2016, 2015, 2012), KDD (2015)
Journal Reviewer:
     Transactions of the Association for Computational Linguistics (TACL)
     Journal of Artificial Intelligence Research (JAIR)

Invited Talks
Miscellaneous

When I have spare time, I enjoy visiting art museums, swimming, running, and snowboarding.

I wrote a biography of my phd advisor Ralph Grishman along with some early history of Information Extraction research in 2017.

I also made a list of the best dressed NLP researchers in 2016/17 , 2015 and 2014.