Yiming Xu

PhD Fellow · Multimodal Document Understanding
Computer Vision Center, Universitat Autònoma de Barcelona

I work in the Vision & Language Group at CVC, UAB, advised by Dimosthenis Karatzas and Ernest Valveny — building agentic document-understanding systems and foundation models for document understanding.

Before Barcelona I earned an MSc at the University of Amsterdam (thesis on Multimodal RAG) and spent two years as principal developer building e-commerce AI agents.

Definition 1 (Document). A page is not an image; it is a tree of meaning that happens to be printed.

News

Jun 2026
MADQA is accepted at ICML 2026 as an Oral.
Apr 2026
AdaNav is accepted at ICDAR 2026 as an Oral.
May 2024
KG passage expansion for QA presented as an Oral at LREC-COLING 2024.

Selected projects

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Recent publications

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Recent writing

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Oct 2025
Planner designHierarchical + leaf embeddings for navigation, not naive top-k retrieval.
Sep 2025
Context engineeringNotes on shaping the context window as a first-class design surface.
Aug 2025
DocLensA layout-aware observer for structured document understanding.

Awards

2025
FPI (Formación de Personal Investigador) Fellowship
2017
Chinese Academy of Sciences Science and Innovation Program Scholarship