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Xuan-Bach Le

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#natural language process... Preprint Jul 2026

MechSparse: Mechanism-Guided Sparse PEFT Selection Is Task-Shaped

A preliminary diagnostic is distill -- prefer activation-norm when output structure dominates, treat causal selectors as a hypothesis for content-dominated tasks -- and release masks, scores, predictions, and evaluation files for direct replay.

Ha X. Son, Phat T. Tran-Truong, Xuan-Bach Le · 0 citations
#natural language process... Preprint Jul 2026

When Audit Quality Fails to Predict Downstream Utility: A Counterfactual Study of Synthetic-Data Selectors for Low-Resource African NLP

Quality-aware synthetic-data selection rests on a proxy: examples that an LLM judge rates as good should also help a downstream model learn. In a controlled replay in low-resource African-language classification, we show that this proxy breaks. Across four languages (Amharic, Hausa, Swahili, Yoruba), two classification...

Ha X. Son, Phat T. Tran-Truong, Xuan-Bach Le · 0 citations
Jul 2026

NOWJ@COLIEE 2026: Adaptive Pipelines for Legal Retrieval and Reasoning

This paper presents the methodologies and results of the NOWJ team's participation across all five tasks of the COLIEE 2026 competition and adopts a retrieval-augmented generation framework with dense retrieval, attention-based reranking, and few-shot-prompted LLM reasoning.

T. Ngo, Hoang-Trung Nguyen, Huu-Dong Nguyen et al. · 0 citations
Conference Open access 2026

QuDAR: Query-Wise Dual-Perspective Adaptive Retrieval

This work presents Q U DAR, a dual-perspective adaptive retrieval framework motivated by a systematic analysis of retrieval behavior across retriever type and query format, enabling effective integration of complementary retrieval signals while mitigating noise.

Joeun Kim, Seunghyouk Yoon, Xuan-Bach Le et al. · 1 citation

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