Welcome

Me, Myself & I

Hello! I am a 4th-year PhD student at the University of Amsterdam, part of AMLAB. My research focuses on building foundation models (FM) for sequential decision-making (SDM) and exploring their applications in scientific research itself.

Foundation Models for Sequential Decision Making

I believe the path to creating effective foundation models for SDM involves training large-scale generative Task2ObsSeq models on all available data. Given a task description (e.g. in natural language) the model generates the corresponding observation sequence which can then easily be translated into actions using simpler, agent-specific models. A first example of this approach is demonstrated in the Universal Policy paper. Since large datasets of (task, trajectory)-pairs are challenging to obtain, pooling data across multiple agents (Open X-Embodiment, Octo: An Open-Source Generalist Robot Policy) and leveraging existing video data becomes essential.

Related Projects:

  1. Extending the universal policy to agents with differing action spaces:
  2. Identifying instructable behaviors from video trajectories in a semi-supervised setting:

Foundation Models for Scientific Research

I'm interested in the potential for current foundation models to accelerate scientific research. However, a significant challenge remains in evaluating generated scientific content. This inspired my recent work:

Socials:

Other Interest:

My other interests mostly inlcude sport: 🏄 🏂 ♟ 🥋 🏃 🏊 🧘

First-Author Publications

    Höpner, N., Kuric, D., & van Hoof, H. (2025). Making Universal Policies Universal.

    [Extended Abstract AAMAS 2025]

    Paper | Code | Project Page

    Höpner, N., Tiddi, I., & van Hoof, H. (2025). Data Augmentation for Instruction Following Policies via Trajectory Segmentation. [AAAI 2025]

    Paper | Code | Project Page

    Höpner, N., Tiddi, I., & van Hoof, H. (2022). Leveraging class abstraction for commonsense reinforcement learning via residual policy gradient methods.

    [IJCAI-ECAI 2022]

    Paper | Code

Other Publications

Publication I had the honour to be a part of:

    Rahman, A., Carlucho, I., Höpner, N., & Albrecht, S. V. (2023). A general learning framework for open ad hoc teamwork using graph-based policy learning. Journal of Machine Learning Research, 24(298), 1-74.

    Rahman, M. A., Hopner, N., Christianos, F., & Albrecht, S. V. (2021, July). Towards open ad hoc teamwork using graph-based policy learning. In International conference on machine learning (pp. 8776-8786). PMLR.

Miscellaneous

Weights & Biases Activity (19.3.2025)

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Word Cloud of my papers

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Last updated: April 2, 2025