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20242026
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cs.CL2026

Object Aligner: A Configurable JSON Schema Similarity Score for Graphs, Applied to LLM Prompt Optimization

Jan Drchal

Large language models (LLMs) are often asked to produce JSON conforming to a fixed schema, powering information extraction, tool calling, agentic planning, and knowledge-graph cons…

cs.CL2026

AIC CTU@AVerImaTeC: dual-retriever RAG for image-text fact checking

Herbert Ullrich, Jan Drchal

In this paper, we present our 3rd place system in the AVerImaTeC shared task, which combines our last year's retrieval-augmented generation (RAG) pipeline with a reverse image sear…

cs.CL2025

AIC CTU@FEVER 8: On-premise fact checking through long context RAG

Herbert Ullrich, Jan Drchal

In this paper, we present our fact-checking pipeline which has scored first in FEVER 8 shared task. Our fact-checking system is a simple two-step RAG pipeline based on our last yea…

cs.CL2025

Claim Extraction for Fact-Checking: Data, Models, and Automated Metrics

Herbert Ullrich, Tomáš Mlynář, Jan Drchal

In this paper, we explore the problem of Claim Extraction using one-to-many text generation methods, comparing LLMs, small summarization models finetuned for the task, and a previo…

cs.CL2024

AIC CTU system at AVeriTeC: Re-framing automated fact-checking as a simple RAG task

Herbert Ullrich, Tomáš Mlynář, Jan Drchal

This paper describes our place submission in the AVeriTeC shared task in which we attempted to address the challenge of fact-checking with evidence retrieved in the wild u…