I am a PhD student under the supervision of Prof. Dr. Stefan Riezler and member of the Statistical NLP Group.
Research Interests
- Convex and Non-convex Optimization
- Generalization and Transferability
- Adversarial Machine Learning
Curriculum Vitae
Education
2019- |
PhD Student, Computational Linguistics |
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Heidelberg University, Germany |
2017 |
Master of Arts, Computational Linguistics |
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Heidelberg University, Germany |
2014 |
Bachelor of Arts, Computational Linguistics |
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Heidelberg University, Germany |
2011 |
Research Student, Information Studies |
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University of Tokyo, Japan |
Employment
05/2019 – |
Research Associate (full time) |
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Institute for Computational Linguistics, Heidelberg University, Germany |
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10/2019 – 12/2019 |
Research Intern |
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NEC Labs Europe, Heidelberg, Germany |
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Information Retrieval, Slot Filling |
01/2018 – 04/2019 |
Research Scientist (full time) |
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Nuance Communications Inc., Aachen, Germany |
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Language modeling |
11/2016 – 06/2017 |
Working Student |
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Leibniz ScienceCampus, Heidelberg, Germany [ LiMo ] |
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Semantic role linking |
08/2013 – 10/2016 |
Working Student |
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IT department at the Centre for East Asian Studies, Heidelberg, Germany [ ZO ] |
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Web administration and application development |
08/2014 – 02/2015 |
Software Developer (full time) |
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Publications Office at the Karl Jaspers Centre, Heidelberg, Germany [ HeiUp ] |
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Digital publishing |
03/2013 |
Intern |
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Department of Scalability and Performance, SAP Inc., Walldorf, Germany |
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12/2007 – 03/2009 |
Working Student |
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Educational Planning Office at University of Tokyo, Tokyo, Japan |
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Video editorial, MOOC contents development |
04/2007 – 03/2009 |
Trainee |
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Suzuki Audio GmbH, Tokyo, Japan |
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Video editorial, Broadcast operations |
Teaching
Publications
Mayumi Ohta, Nathaniel Berger, Artem Sokolov and Stefan Riezler
Sparse Perturbations for Improved Convergence in Stochastic Zeroth-Order Optimization
The 6th International Conference on Machine Learning, Optimization, and Data Science (LOD), Siena, Italy, 2020
@article{ohta2020,
author = {Ohta, Mayumi and Berger, Nathaniel and Sokolov, Artem and Riezler, Stefan},
year = {2020},
title = {Sparse Perturbations for Improved Convergence in Stochastic Zeroth-Order Optimization},
journal = {The 6th International Conference on Machine Learning, Optimization, and Data Science},
journal-abbrev = {LOD},
city = {Siena, Italy},
url = {https://arxiv.org/abs/2006.01759}
}
Artem Sokolov, Julian Hitschler, Mayumi Ohta and Stefan Riezler
Sparse Stochastic Zeroth-Order Optimization with an Application to Bandit Structured Prediction
arXiv preprint arXiv:1806.04458, 2018 (Preprint)
@inproceedings{sokolov2018,
author = {Sokolov, Artem and Hitschler, Julian and Ohta, Mayumi and Riezler, Stefan},
title = {Sparse Stochastic Zeroth-Order Optimization with an Application to Bandit Structured Prediction},
journal = {arXiv preprint arXiv:1806.04458},
note = {Preprint},
year = {2018},
url = {https://arxiv.org/abs/1806.04458}
}
Julian Hitschler, Laura Jehl, Sariya Karimova, Mayumi Ohta, Benjamin Körner and Stefan Riezler
Otedama: Fast Rule-based Pre-Ordering for Machine Translation
The Prague Bulletin of Mathematical Linguistics (PBML), 106, 159–168, 2016
@article{hitschler2016b,
author = {Hitschler, Julian and Jehl, Laura and Karimova, Sariya and Ohta, Mayumi and K\"{o}rner, Benjamin and Riezler, Stefan},
title = {Otedama: Fast Rule-based Pre-Ordering for Machine Translation},
journal = {The Prague Bulletin of Mathematical Linguistics},
journal-abbrev = {PBML},
number = {106},
pages = {159--168},
year = {2016},
url = {http://www.cl.uni-heidelberg.de/~riezler/publications/papers/MTM2016.pdf}
}