Gabriel Moreira

PhD student at CMU-LTI and ISR-IST

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I’m a PhD student at LTI-CMU and ISR-IST, under a CMU Portugal scholarship. I’m fortunate to be advised by João Paulo Costeira (IST), Manuel Marques (IST) and Chenyan Xiong (CMU). My research focuses on the intersection between vision and language, with an emphasis on representation learning for recognition and generation. During the summer of 2024, I joined Meta Reality Labs as a research scientist intern. Prior to my PhD, I worked on pose graph optimization and spent six months as a research intern at Airbus.

I’ve served as reviewer for AAAI, ICRA, CVPR, ICLR and ICML (Gold reviewer 2026).

news

Jun 23, 2026 I’ll be at ICML 2026 in Seoul, South Korea, presenting my paper: Spectral Guidance for Efficient and Flexible Control of Diffusion Models.
Jan 22, 2025 I’ll be at AISTATS 2025 in Mai Khao, Thailand, presenting our paper Learning Visual Semantic Subspace Representations.
Jun 03, 2024 I’ve join Meta Reality Labs as a research scientist intern!
May 13, 2024 I’ll be in Yokohama, at ICRA 2024, presenting VICAN.
Jan 01, 2024 I’ll be at WACV 2024, in Waikoloa, presenting our paper on Hyperbolic vs Euclidean embeddings in few-shot learning.

publications

  1. Native Hierarchical and Compositional Representations with Subspace Embeddings
    Gabriel Moreira, Zita Marinho, Manuel Marques, João Paulo Costeira, and Chenyan Xiong
    In Proceedings of the 32nd ACM SIGKDD Conference on Knowledge Discovery and Data Mining V. 2 , 2026
  2. Spectral Guidance for Flexible and Efficient Control of Diffusion Models
    Gabriel Moreira, Manuel Marques, João Paulo Costeira, and Chenyan Xiong
    In International Conference on Machine Learning , 2026
  3. WACV
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    Fast pose graph optimization via Krylov-Schur and Cholesky factorization
    Gabriel Moreira, Manuel Marques, and João Paulo Costeira
    In Proceedings of the IEEE/CVF Winter Conference on Applications of Computer Vision (WACV) , 2021
    PDF Video
  4. ICCV
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    Rotation averaging in a split second: A primal-dual method and a closed-form for cycle graphs
    Gabriel Moreira, Manuel Marques, and João Paulo Costeira
    In Proceedings of the IEEE/CVF International Conference on Computer Vision (ICCV) , 2021
    PDF Video
  5. WACV
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    Hyperbolic vs Euclidean Embeddings in Few-Shot Learning: Two Sides of the Same Coin
    Gabriel Moreira, Manuel Marques, João Paulo Costeira, and Alexander Hauptmann
    In Proceedings of the IEEE/CVF Winter Conference on Applications of Computer Vision (WACV) , 2024
    PDF Video
  6. ICRA
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    VICAN: Very Efficient Calibration Algorithm for Large Camera Networks
    Gabriel Moreira, Manuel Marques, João Paulo Costeira, and Alexander Hauptmann
    In Proceedings of the IEEE International Conference on Robotics and Automation (ICRA) , 2024
    PDF Video