Meet Our Team
Meet the bright minds behind NIMI: a team of passionate researchers united in our commitment to developing foundational and theoretical approaches in artificial intelligence. Driven by curiosity and guided by leading scientific methods, we are inspired to make impactful contributions in areas such as healthcare, environmental studies, and AI for good, aiming to pave the way for advancements that benefit society and the planet.
Group Leader
Prof. Dr. Sahar Vahdati
Group leader
Nature-Inspired Machine Learning (NIMI)
Sahar Vahdati is a Professor of AI for Scholarly Communication at TIB – Leibniz Information Centre for Science and Technology and Hannover University. Passionate about the transformative power of artificial intelligence, Sahar is dedicated to exploring its positive impact on life, humanity, nature, and the environment.
She leads the Nature-Inspired Machine Learning Research Group, a cross-organizational initiative uniting expertise from Hannover, Leipzig, and Dresden. Her research focuses on advancing representation learning and foundational models, with the goal of addressing scientific and societal challenges. Sahar has contributed to more than 100 scholarly publications, which are frequently cited and have significantly influenced the AI and machine learning communities.
In addition to her research leadership, Sahar serves as the General Chair of the SEMANTiCS conference, where she champions the mission of bringing science into practice with tangible, positive impacts. With a vision rooted in innovation and collaboration, she is committed to using AI as a force for good.
Proof. Vahdati is deeply passionate about integrating AI into science and education, aiming to enhance learning experiences and accelerate scientific discovery. In her spare time, she is working on Enigmia, an innovative application designed to solve complex math riddles and puzzles, showcasing her dedication to blending creativity and AI for educational purposes.
Here is the list of my academic degrees and the research organizations in which I conducted my research over the past years:
Research Group Lead at the Center for Scalable Data Analytics and Artificial Intelligence (ScaDS.AI) Dresden/Leipzig.
Research Group Lead of Nature-Inspired Machine Intelligence at the Institute for Applied In-formatics (InfAI) Institute in Dresden.
Postdoctoral Fellow in the Intelligent Information Systems group at the Department of Computer Science, University of Oxford, UK – led by Prof. Georg Gottlob.
Postdoctoral Fellow in the department of Intelligent Systems (Institute of Computer Science III) at the University of Bonn.
PhD of Natural Science (Dr. rer. nat) in the department of Intelligent Systems (Institute of Computer Science III) at the University of Bonn, Germany – doctoral dissertation under supervision of Prof. S¨oren Auer at the Enterprise Information System (EIS) group.
Master of Computer Science in the department of Intelligent Systems (Institute of Computer Science III) at the University of Bonn, Germany – master thesis under the supervision of Prof. Rainer Manthey, and Prof. Andreas Behrend at the the Intelligent Databases (IDB) group.
Bachelor of Software Engineering in Tabriz, Iran – bachelor thesis under the supervision of Prof. Farhad Pourreza.
The details related to the development of my research in each of the above-mentioned career steps can be summarized as the following disciplines:
Knowledge-driven AI
Since 1st September 2023, I joined TU Dresden and the Scdas.AI center as research group. I mainly target to build up a group with a focus on the connection of knowledge graphs and large language models, and the role of Neuro-symbolic methods for future learning models. My position is funded with additional two doctoral students with whom I am exploring the above-mentioned topics.
Representation Learning
Since I joined InfAI in 2020 a research group leader, I worked on my vision of Nature-Inspired Machine Intel-ligence. We acquired group budget through EKFZ funding, and EU projects. I have been directing the group research activities, and research mainly on my vision for research in machine intelligence inspired by natural science that can result in innovations to address weaknesses of current ML approaches. The main activities of the group and planned research directions are focused on representation learning.
Learning and Reasoning in Large Scale Knowledge Graphs.
Shortly before finishing my dissertation, I became very interested in using link prediction techniques over the scholarly knowledge graph we had constructed by then. I used link prediction techniques to provide recommendations in the context of scholarly communication. Initially, I used graph partition approaches relying on semantic similarity measures to determine the relatedness between scholarly entities. I further continued with this line of research by using knowledge graph embedding (KGE) models in several other use cases, as well proposing new models. This is still a focal research direction of myself and my group.
Knowledge Graph-empowered Intelligent Information Systems
The core of my PhD topic was to explore the challenges and approaches for automated knowledge acquisition and curation, integration and management of heterogeneous metadata on the Web towards. This research has been conducted using the example of scholarly metadata towards a collaborative construction and management of a science knowledge graph. The aim was to facilitate the integrated use of different knowledge-aware AI-based methods, analytical techniques, and tools for improving scholarly communication. My research contributions provide useful approaches by following the FAIR data principles and providing metadata in a findable, accessible, interoperable, and reusable format. Efficient and scalable methods for integrating large amounts of data, as well as knowledge representation and discovery, were key challenges that I tackled. As a major part of my research activities, I constructed a specific knowledge graph for which I also provided quality-based assessments and meta research analytics by applying data mining and link discovery approaches.
Scientific publishing I published at venues that target core of artificial intelligence that deals with knowledge representation, learning and management such as ECAI, AAAI, EMNLP, IJCNN, IEEE Access, PAKDD, EDBT, ILP, ESWC, EKAW, TPDL, ICSC, MTSR, ECIR, and SEMANTiCS. I value collaborative research work and have conducted research not only with members of the Computer Science department at the University of Bonn and University of Oxford but also with the Knowledge Media Institute at the Open University London – UK, the CNR research council of Italy, Institute Mihajlo Pupin, Belgrade in Serbia, the University Hospital Dresden, the University Hospital Leipzig, the L3S Research Center in Hanover, and University of Vienna . Community involvement and Event Organization Active community involvement is very rewarding and beneficial for increasing the impact of science in general. I am the co-general chair of SEMANTICS conference with approximately 500 visitors per year.
2024
Rastakhiz, Fardin; Eftekhari, Mahdi; Vahdati, Sahar
QuickCharNet: An Efficient URL Classification Framework for Enhanced Search Engine Optimization Journal Article
In: IEEE Access, vol. 12, pp. 156965–156979, 2024.
BibTeX | Links:
@article{DBLP:journals/access/RastakhizEV24,
title = {QuickCharNet: An Efficient URL Classification Framework for Enhanced
Search Engine Optimization},
author = {Fardin Rastakhiz and Mahdi Eftekhari and Sahar Vahdati},
url = {https://doi.org/10.1109/ACCESS.2024.3484578},
doi = {10.1109/ACCESS.2024.3484578},
year = {2024},
date = {2024-01-01},
journal = {IEEE Access},
volume = {12},
pages = {156965–156979},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Saberi-Movahed, Farid; Biswas, Bitasta; Tiwari, Prayag; Lehmann, Jens; Vahdati, Sahar
Deep Nonnegative Matrix Factorization with Joint Global and Local Structure Preservation Journal Article
In: Expert Syst. Appl., vol. 249, pp. 123645, 2024.
BibTeX | Links:
@article{DBLP:journals/eswa/SaberiMovahedBTLV24,
title = {Deep Nonnegative Matrix Factorization with Joint Global and Local
Structure Preservation},
author = {Farid Saberi-Movahed and Bitasta Biswas and Prayag Tiwari and Jens Lehmann and Sahar Vahdati},
url = {https://doi.org/10.1016/j.eswa.2024.123645},
doi = {10.1016/J.ESWA.2024.123645},
year = {2024},
date = {2024-01-01},
journal = {Expert Syst. Appl.},
volume = {249},
pages = {123645},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Lehmann, Jens; Bhandiwad, Dhananjay; Gattogi, Preetam; Vahdati, Sahar
Beyond Boundaries: A Human-like Approach for Question Answering over Structured and Unstructured Information Sources Journal Article
In: Trans. Assoc. Comput. Linguistics, vol. 12, pp. 786–802, 2024.
BibTeX | Links:
@article{DBLP:journals/tacl/0001BGV24,
title = {Beyond Boundaries: A Human-like Approach for Question Answering
over Structured and Unstructured Information Sources},
author = {Jens Lehmann and Dhananjay Bhandiwad and Preetam Gattogi and Sahar Vahdati},
url = {https://doi.org/10.1162/tacl_a_00671},
doi = {10.1162/TACL_A_00671},
year = {2024},
date = {2024-01-01},
journal = {Trans. Assoc. Comput. Linguistics},
volume = {12},
pages = {786–802},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Senior Researchers
Dr. Kossi Amouzouvi
Senior Researcher
Nature-Inspired Machine Learning (NIMI)
Kossi Amouzouvi is a postdoctoral researcher and is involved in joint collaboration with Scads.AI and InfAI. He is by background a mathematician and holds a PhD in Density Functional Theory, from the University of the Witwatersrand, he is a member of Science in Mathematics, African Institute for Mathematical Sciences (AIMS – Ghana) where he did his master on Hochschild Cohomology and Deformation Theory, and his second master is on Mathematics, from his hometown, University of Lomé (Togo), with focus on Differential Geometry. He is focusing on representation learning and quantum machine learning.
Dr. Roman Liessner
Senior Researcher
Nature-Inspired Machine Learning (NIMI)
Roman Liessner is a mechatronics engineer with over 10 years of experience in developing cutting-edge applications with machine learning. He has a PhD in reinforcement learning with application in energy management. In his spare time, he enjoys spending time with his son, cycling and pursuing his curiosity in artificial intelligence. Connect with him on LinkedIn
Farhad Safaei
Senior Researcher
Nature-Inspired Machine Learning (NIMI)
Farhad Safaei is a skilled AI and Reinforcement Learning expert, committed to harnessing the power of AI to tackle real-world challenges across diverse domains. With experience in various AI-driven projects in the industry, Farhad has gained valuable insights into addressing complex problems and developing effective solutions. In 2019, he joined Deutsche Bahn (DB) as a Senior Reinforcement Learning Expert, where he played a significant role as an early contributor to an innovative project aimed at creating an AI-based capacity and traffic management system using Multi-Agent Reinforcement Learning. Alongside his position at DB, Farhad is pursuing academic research focused on enhancing the robustness and reliability of reinforcement learning methods for critical and practical applications. Driven by a strong passion for making a tangible impact on human lives, Farhad is highly motivated about his research collaboration with the InfAI Institute, through which he can leverage his AI expertise to develop innovative solutions for pressing healthcare challenges.
Robert Wardenga
Senior Researcher
Nature-Inspired Machine Learning (NIMI)
Robert Wardenga is a researcher in the NIMI group within InfAI. His main research interest is the integration of knowledge into the Machine Learning Pipeline to improve Factuality and Truthfulness. This entails research in Representation Learning, Natural Language Generation and Reinforcement Learning. Before joining the InfAI I worked as a mathematician at the TU Dresden.
—
Prof. Dr. Jens Lehmann
PhD Supervisor
Nature-Inspired Machine Learning (NIMI)
Principal Scientist, Amazon AGI (Artificial General Intelligence)
Honorary Professor at TU Dresden
Member of InfAI
2024
Saberi-Movahed, Farid; Biswas, Bitasta; Tiwari, Prayag; Lehmann, Jens; Vahdati, Sahar
Deep Nonnegative Matrix Factorization with Joint Global and Local Structure Preservation Journal Article
In: Expert Syst. Appl., vol. 249, pp. 123645, 2024.
BibTeX | Links:
@article{DBLP:journals/eswa/SaberiMovahedBTLV24,
title = {Deep Nonnegative Matrix Factorization with Joint Global and Local
Structure Preservation},
author = {Farid Saberi-Movahed and Bitasta Biswas and Prayag Tiwari and Jens Lehmann and Sahar Vahdati},
url = {https://doi.org/10.1016/j.eswa.2024.123645},
doi = {10.1016/J.ESWA.2024.123645},
year = {2024},
date = {2024-01-01},
journal = {Expert Syst. Appl.},
volume = {249},
pages = {123645},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Lehmann, Jens; Bhandiwad, Dhananjay; Gattogi, Preetam; Vahdati, Sahar
Beyond Boundaries: A Human-like Approach for Question Answering over Structured and Unstructured Information Sources Journal Article
In: Trans. Assoc. Comput. Linguistics, vol. 12, pp. 786–802, 2024.
BibTeX | Links:
@article{DBLP:journals/tacl/0001BGV24,
title = {Beyond Boundaries: A Human-like Approach for Question Answering
over Structured and Unstructured Information Sources},
author = {Jens Lehmann and Dhananjay Bhandiwad and Preetam Gattogi and Sahar Vahdati},
url = {https://doi.org/10.1162/tacl_a_00671},
doi = {10.1162/TACL_A_00671},
year = {2024},
date = {2024-01-01},
journal = {Trans. Assoc. Comput. Linguistics},
volume = {12},
pages = {786–802},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Tiwari, Prayag; Movahed, Farid Saberi; Karami, Saeed; Saberi-Movahed, Farshad; Lehmann, Jens; Vahdati, Sahar
A Self-Representation Learning Method for Unsupervised Feature Selection using Feature Space Basis Journal Article
In: Trans. Mach. Learn. Res., vol. 2024, 2024.
BibTeX | Links:
@article{DBLP:journals/tmlr/TiwariMKS0V24,
title = {A Self-Representation Learning Method for Unsupervised Feature Selection
using Feature Space Basis},
author = {Prayag Tiwari and Farid Saberi Movahed and Saeed Karami and Farshad Saberi-Movahed and Jens Lehmann and Sahar Vahdati},
url = {https://openreview.net/forum?id=LNvbgBFPMt},
year = {2024},
date = {2024-01-01},
journal = {Trans. Mach. Learn. Res.},
volume = {2024},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Amouzouvi, Kossi; Song, Bowen; Vahdati, Sahar; Lehmann, Jens
Knowledge GeoGebra: Leveraging Geometry of Relation Embeddings in Knowledge Graph Completion Proceedings Article
In: Calzolari, Nicoletta; Kan, Min-Yen; Hoste, Véronique; Lenci, Alessandro; Sakti, Sakriani; Xue, Nianwen (Ed.): Proceedings of the 2024 Joint International Conference on Computational Linguistics, Language Resources and Evaluation, LREC/COLING 2024, 20-25 May, 2024, Torino, Italy, pp. 9832–9842, ELRA and ICCL, 2024.
BibTeX | Links:
@inproceedings{DBLP:conf/coling/AmouzouviSV024,
title = {Knowledge GeoGebra: Leveraging Geometry of Relation Embeddings in
Knowledge Graph Completion},
author = {Kossi Amouzouvi and Bowen Song and Sahar Vahdati and Jens Lehmann},
editor = {Nicoletta Calzolari and Min-Yen Kan and Véronique Hoste and Alessandro Lenci and Sakriani Sakti and Nianwen Xue},
url = {https://aclanthology.org/2024.lrec-main.859},
year = {2024},
date = {2024-01-01},
booktitle = {Proceedings of the 2024 Joint International Conference on Computational
Linguistics, Language Resources and Evaluation, LREC/COLING 2024,
20-25 May, 2024, Torino, Italy},
pages = {9832–9842},
publisher = {ELRA and ICCL},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
Safaei, Farhad; Nenadovic, Milos; Wittenstein, Jakob; Lehmann, Jens; Vahdati, Sahar
X-Vent: ICU Ventilation with Explainable Model-Based Reinforcement Learning Proceedings Article
In: Endriss, Ulle; Melo, Francisco S.; Bach, Kerstin; Diz, Alberto José Bugar'ın; Alonso-Moral, Jose Maria; Barro, Senén; Heintz, Fredrik (Ed.): ECAI 2024 - 27th European Conference on Artificial Intelligence, 19-24 October 2024, Santiago de Compostela, Spain - Including 13th Conference on Prestigious Applications of Intelligent Systems (PAIS 2024), pp. 4719–4726, IOS Press, 2024.
BibTeX | Links:
@inproceedings{DBLP:conf/ecai/SafaeiNW0V24,
title = {X-Vent: ICU Ventilation with Explainable Model-Based Reinforcement
Learning},
author = {Farhad Safaei and Milos Nenadovic and Jakob Wittenstein and Jens Lehmann and Sahar Vahdati},
editor = {Ulle Endriss and Francisco S. Melo and Kerstin Bach and Alberto José Bugar'ın Diz and Jose Maria Alonso-Moral and Senén Barro and Fredrik Heintz},
url = {https://doi.org/10.3233/FAIA241069},
doi = {10.3233/FAIA241069},
year = {2024},
date = {2024-01-01},
booktitle = {ECAI 2024 - 27th European Conference on Artificial Intelligence,
19-24 October 2024, Santiago de Compostela, Spain - Including 13th
Conference on Prestigious Applications of Intelligent Systems (PAIS
2024)},
volume = {392},
pages = {4719–4726},
publisher = {IOS Press},
series = {Frontiers in Artificial Intelligence and Applications},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
Research Associate (PhD)
Bowen Song
Research Associate
Nature-Inspired Machine Learning (NIMI)
Bowen is a PhD student, and holds a CSC grant that supports his exploration into the world of Representation Learning. Focused on temporal knowledge graph embedding models, Bowen’s research deals with the dynamic interplay of data over time. Bowen emerges as a pioneering force, navigating the complex path of knowledge and leaving an indelible mark on the future of artificial intelligence
Jason Li
Research Associate
Nature-Inspired Machine Learning (NIMI)
Jason Li is a PhD student who is working on Reinforcement Learning. He received his M.Sc. Computer Science from University College London and is currently actively working in the EU funded research project IntelliLung which aims to develop an AI based decision support system in intensive care units. His research focuses on the practical application and validation of RL, in particular offline RL and RL in the medical domain.
Preetam Gattogi
Research Associate
Nature-Inspired Machine Learning (NIMI)
Preetam, a researcher at the ScadDS.AI center, focuses on investigating the factual accuracy of large language models. His research is uniquely centered on human and mind-inspired intelligence to refine the precision of these language models. Within the dynamic landscape of artificial intelligence, Preetam’s work contributes to the advancement of understanding and improving the accuracy of language models.
Dhananajay Bhandiwad
Research Associate
Nature-Inspired Machine Learning (NIMI)
Dhananajay, a PhD student at the ScadDS.AI center, is dedicated to researching the factual accuracy of large language models and knowledge graphs. His work in the language and knowledge intersect, exploring ways to enhance the precision of these expansive information systems. As a scholar within the ScadDS.AI center, Dhananajay is positioned at the forefront of advancing our understanding of how accuracy can be refined in the expansive landscape of language models and knowledge representation.
Mohammad Rezaei Ravari
Research Associate
Nature-Inspired Machine Learning (NIMI)
Mohammad Rezaei Ravari completed his academic journey with a B.Sc.
Degree in Software Engineering from Vali-Asr University of Rafsanjan (2013) and an M.Sc.
Degree in Artificial Intelligence from Bahonar University of Kerman (2020).
He has been awarded the NHR Ph.D. fellowship for 2024.
His recent research has been focused on Feature Selection, Image Processing, Deep Neural Networks, and Large Language Models.
Charvi Jain
Research Associate
Nature-Inspired Machine Learning (NIMI)
Charvi is doing her doctoral studies on the topic of External Systems Biology Knowledge Integration in Large Language Models. She joined us since February 2024 by winning a grant for doctoral research from School of Embedded and Composite AI – SECAI, Dresden. Dr. Nandu Gopan, and Dr. Sahar Vahdati are her mentors.
Tshiangomba Kasonsa Reagan
Research Associate
Nature-Inspired Machine Learning (NIMI)
Tshiangomba is a Ph.D. candidate at the NIMI group and AIMS RIC funded by the Carnegie Corporation of New York, which devotes its efforts toward advancing education and knowledge to support educational activities across the world.
He received his M.Sc. in Mathematical Engineering from the University of L’Aquila in Italy, an M.Sc. of Sciences in Mathematical Science at the African Institute for Mathematical Sciences (AIMS), and a 5-year bachelor’s degree in Pure Mathematics with a major in Differential Geometry.
His current Ph.D. research focuses on using generative models to perform link prediction, build robust knowledge graph embedding models, and online learning for knowledge graphs using the idea of interacting particles to define the dynamic.
Student Assistants
Prathmesh Dudhe
Student Assistant
Nature-Inspired Machine Learning (NIMI)
Prathmesh Dudhe is a master student of TU Dresden and working on the IntelliLung project. He is working on data preparation and exploration of reinforcement learning-based algorithms for supporting improvement of clinician decisions in intensive care units.
Qasid Saleem
Student Assistant
Nature-Inspired Machine Learning (NIMI)
Qasid Saleem has been working on several projects, and has a broad range of skills, from reinforcement learning, to knowledge graphs and language models. Qasid finished his master thesis also in the NIMI group on link prediction. And recently has been heavily involved in E-vita project, building a conversation AI system for elderly people based on RAZA system and language models.
Nur A Zarin Nishat
Student Assistant
Nature-Inspired Machine Learning (NIMI)
A Master’s student in the computational modeling and simulation in life sciences program at TU Dresden. Previously worked at Siemens. Current research interests lie in the application of knowledge graph embedding and machine learning in the field of molecular biology, specifically in genomics.
Kevin
Student Assistants
Nature-Inspired Machine Learning (NIMI)
Kevin has a bachelor’s degree in media informatics and is particularly interested in machine learning, especially natural language processing. As part of the iDoks project, he is actively working on the development of a summary generation demonstrator and a library for evaluating the generated summaries. This library also enables the creation of datasets for improving summary models through human feedback.
Visiting Researchers
Abigail Amankwah
Visitor Researcher
Nature-Inspired Machine Learning (NIMI)
Abigail is currently doing research on Deep Nonnegative Matrix Tri-Factorization for Image Clustering in collaboration of NIMI and the University of Cape Coast (UCC), Ghana. In 2022 ranking, UCC was adjudged the best university in Ghana, in West Africa, the 4th best university in Africa and the best university globally for research influence.
Developer
Sanaz Alipour Mazloumi
Software Developer
Nature-Inspired Machine Learning (NIMI)
I am a software development engineer with over 10 years of experience in developing web , desktop and mobile applications. I have worked on various projects, ranging from e-commerce platforms, social media networks, to data analysis tools. I am also passionate about learning new technologies and keeping up with the latest trends in the industry. I enjoy collaborating with other developers, designers, and clients to deliver innovative and user-friendly solutions. I am looking for a challenging and rewarding position where I can apply my skills and experience to create impactful products.
Join Our Team!
We support students who want to apply for DAAD or CSC and similar doctoral grants.