Author

Zhivar Sourati

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#computer vision Preprint Oct 2026

VELD-QA: A Large-Scale Dataset for Visual Evidence Grounding and Question Answering in Long Documents

Existing long-document QA benchmarks rarely combine large-scale human-authored questions with detailed visual evidence annotations, limiting diagnosis of evidence localization and interpretation failures. We present VELD-QA, a large-scale benchmark for Visual Evidence grounding and question answering in Long Documents....

Zhivar Sourati, Marianne Menglin Liu, Rong Wang et al. · 0 citations

#artificial intelligence Preprint Oct 2026

Same Context, Different Agents: A Behavioral Study of Semantic Layers, Orchestration and Compaction in Data Agents

Answering questions over heterogeneous data means combining evidence from files, databases, documents and the web. Data agents automate this, but their success depends on context. Three context-engineering techniques (CETs) help by shaping it: semantic layers describe the data, orchestration splits work among agents, a...

Zhivar Sourati, Marianne Menglin Liu, Zheng Wang et al. · 0 citations

#natural language process... Preprint Sep 2026

Cognitive Expert Language Models Better Align with the Corresponding Brain Systems

Large language models (LLMs) can predict human brain activity across a variety of brain regions during natural language comprehension. Typically, however, LLM-brain alignment is measured using one model for different regions of the brain, and then model performance is summarized across regions. This one-model-fits-all...

Zhivar Sourati, Meng-Hong Wu, Nona Ghazizadeh et al. · 0 citations