PhD NLP: Generalizability of NLP experiments

Vrije Universiteit Amsterdam
  • PhD NLP: Generalizability of NLP experiments
  • University Graduate

Why build AI systems that replace people if we can build AI systems that collaborate with people? Hybrid Intelligence is the combination of human and machine intelligence, expanding human intellect instead of replacing it. Our goal is to design Hybrid Intelligent systems, an approach to Artificial Intelligence that puts humans at the centre, changing the course of the ongoing AI revolution.

The project will be recruiting 15 PhD or postdoc positions in total. For more information on the project see www.hybrid-intelligence-centre.nl

At the Vrije Universiteit Amsterdam we are looking for a PhD candidate in computational linguistics for the project Predicting generalizability of NLP experiments 

Location: AMSTERDAM
FTE: 0.8 - 1

Job description

Natural language processing has a strong tradition in experimental research, where various methods are evaluated on gold standard datasets. Though these experiments can be valuable to determine which methods work best, they do not necessarily provide sufficient insight into the general quality of our methods for real-life applications. There are two questions that often need to be addressed before knowing whether a method is suitable to be used in a real-life application in addition to the outcome of a typical NLP experiment. First, what kind of errors does the method make and how problematic are they for the application? Second, how predictive are results obtained on the benchmark sets for the data that will be used in the real-life application? This project aims to address these two questions combining advanced systematic error analyses and formal comparison of textual data and language models.

Though potential erroneous correlations were still relatively easily identified in scenarios of old-fashioned extensive feature engineering and methods such as K-nearest neighbors, Naive Bayes, logistic regression, SVM, this has become more challenging now that technologies predominantly make use of neural networks. The field has become increasingly interested in exploring ways to interpret neural networks, but, once again, many studies focus on field internal questions (what linguistic information is captured? Which architectures learn compositionality to what extent?). We aim to take this research a step further and see if we can use insights into the workings of deep models to predict how they will work for specific applications that make use of data different from the original evaluation data. Both error analysis and formal comparison methods will contribute to establishing the relation between generic language models, task specific training data, evaluation data and ”new data”. By gaining a more profound understanding of these relations, we try and define metrics that can be used to estimate or even predict to what extent results on a new dataset will be similar to those reported on the evaluation data (both in terms of overall performance and in terms of types of errors).

As a use case, we will look at hate speech and offensive language detection. We will collaborate with social scientists who want to study online aggressive behavior using the models we build for Dutch and English (and possibly other languages). 

Your duties

You will be working on a PhD on the topic described above. In particular, you will

  • carry out reproducible experiments on models for detecting online verbal aggression
  • collaborate on designing a framework for testing the generalizability of the outcome of the experiments on such models
  • investigate to what extent various models are suitable to be used for social science research based on systematic error analyses and the outcome of the generalizability results
  • write research articles and present your work, which is to culminate in a successful dissertation, at international conferences 


Requirements

The prospective candidate has a Masters degree (MA/MSc) or equivalent in computational linguistics, or related field (AI, Computer Science with focus on NLP). Candidates from other fields with a strong background in machine learning and knowledge of linguistics can also apply. Solid programming skills are required. The project involves interdisciplinary collaboration. The ability to communicate with researchers from different domains is therefore important. Experience with/knowledge of statistical analysis is a plus.

For questions about the project, please contact: antske.fokkens@vu.nl

If you want to be also considered for one of our other PhD positions, then also upload your documents to our Hybrid Intelligence talent pool at  https://bit.ly/HIC-Talentpool  

Your information will then be shared among the researchers in the consortium, and you may be approached for one of the other positions listed on  www.hybrid-intelligence-centre.nl/jobs

What are we offering?

A challenging position in a socially involved organization. You will  be part of the Hybrid Intelligence Center, a collaboration between top AI-researchers from 6 Dutch Universities. You will receive joint supervision from:
- dr. Antske Fokkens (Associate Professor in Computational Linguistics, Vrije Universiteit)
- dr. Eric Nalisnick (Assistant Professor in Machine Learning, University of Amsterdam)
- dr. Ivar Vermeulen (Associate Professor in Communication Science, Vrije Universiteit)

The salary will be in accordance with university regulations for academic personnel and amounts €2,395 (PhD) per month during the first year and increases to €3,061 (PhD) per month during the fourth year, based on a full-time employment. The job profile: is based on the university job ranking system and is vacant for at least 0.8 FTE.

The appointment will initially be for 1 year. After a satisfactory evaluation of the initial appointment, the contract will be extended for a total duration of 4 years (or 5 years in case of a 0.8 fte contract).

Additionally, Vrije Universiteit Amsterdam offers excellent fringe benefits and various schemes and regulations to promote a good work/life balance, such as:
  • a maximum of 41 days of annual leave based on full-time employment
  • 8% holiday allowance and 8.3% end-of-year bonus
  • solid pension scheme (ABP), contribution to commuting expenses
  • a wide range of sports facilities which staff may use at a modest charge

About Vrije Universiteit Amsterdam

The ambition of Vrije Universiteit Amsterdam is clear: to contribute to a better world through outstanding education and ground-breaking research. We strive to be a university where personal development and commitment to society play a leading role. A university where people from different disciplines and backgrounds collaborate to achieve innovations and to generate new knowledge. Our teaching and research encompass the entire spectrum of academic endeavour – from the humanities, the social sciences and the natural sciences through to the life sciences and the medical sciences.

Vrije Universiteit Amsterdam is home to more than 26,000 students. We employ over 4,600 individuals. The VU campus is easily accessible and located in the heart of Amsterdam’s Zuidas district, a truly inspiring environment for teaching and research.

Diversity
We are an inclusive university community. Diversity is one of our most important values. We believe that engaging in international activities and welcoming students and staff from a wide variety of backgrounds enhances the quality of our education and research. We are always looking for people who can enrich our world with their own unique perspectives and experiences.

Faculty of Humanities
The Faculty of Humanities links a number of fields of study: Language, Literature and Communication, Art & Culture, History, Antiquities and Philosophy. Our teaching and research focus on current societal and scientific themes: from artificial intelligence to visual culture, from urbanization to the history of slavery, from ‘fake news’ in journalism to communication in organizations. We strive to ensure small group sizes. Innovative education and interdisciplinary research are our hallmarks.

Working at the Faculty of Humanities means making a real contribution to the quality of leading education and research in an inspiring and personal work and study climate. We employ more than 250 staff members, and we are home to around 1,300 students.

Application

Are you interested in this position? Please apply via the application button until August 31, 2020 and upload:
  • Your CV
  • Your academic records (including course names and grades)
  • A motivation letter

Applications received by e-mail will not be processed.

Vacancy questions
If you have any questions regarding this vacancy, you may contact:

Name: Antske Fokkens
Position: Associate Professor
E-mail: antske.fokkens@vu.nl

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