NEDOQwen: Diagnosing and Repairing a Turkish-Centric Small Language Model for Multilingual Evaluation

Ahmet Rıfat Öztürk, Yağız Ekrem Dalar, Nedim Mutlu Sezer, Ömer Faruk Aksoy, Feyzi Arda Salihoğlu


Abstract
Multilingual language modeling is often evaluated through broad aggregate scores, yet language-specific failures can remain hidden, especially for morphologically rich and underrepresented languages. We present NEDOQwen, a Turkish-centric 0.824B decoder-only small language model research artifact, and use it to study a low-cost diagnosis-and-repair workflow for Turkish evaluation. Internal Turkish instruction diagnostics improve after supervised fine-tuning, but external Turkish and Turkic multiple-choice benchmarks reveal weak academic knowledge and severe answer-label bias. A compact benchmark-safe repair stage yields a small improvement on TurkishMMLU-sub, from 18.11% to 21.00%, and a larger improvement on TUMLU-mini Turkish, from 21.33% to 32.22%, while an answer-label-only ablation reaches 19.56% and 27.00%. We further analyze tokenizer coverage, internal-vs-external evaluation mismatch, prediction-label distributions, paired uncertainty, and compute cost. The contribution is not a state-of-the-art Turkish model, but an auditable case study showing how small language-specific models can expose and partially repair multilingual evaluation failures while remaining unreliable.
Anthology ID:
2026.mrl-1.2
Volume:
Proceedings of the 6th Workshop on Multilingual Representation Learning (MRL 2026)
Month:
October
Year:
2026
Address:
Budapest, Hungary
Editors:
David Ifeoluwa Adelani, Jesujoba Alabi, Catherine Arnett, Tyler Chang, C.M. Downey, Omer Goldman, Senyu Li, Lester James Validad Miranda, Jirui Qi, David Stap, Genta Indra Winata, Xinyu Crystina Zhang
Venues:
MRL | WS
SIG:
Publisher:
Association for Computational Linguistics
Note:
Pages:
19–26
Language:
URL:
https://aclanthology.org/2026.mrl-1.2/
DOI:
Bibkey:
Cite (ACL):
Ahmet Rıfat Öztürk, Yağız Ekrem Dalar, Nedim Mutlu Sezer, Ömer Faruk Aksoy, and Feyzi Arda Salihoğlu. 2026. NEDOQwen: Diagnosing and Repairing a Turkish-Centric Small Language Model for Multilingual Evaluation. In Proceedings of the 6th Workshop on Multilingual Representation Learning (MRL 2026), pages 19–26, Budapest, Hungary. Association for Computational Linguistics.
Cite (Informal):
NEDOQwen: Diagnosing and Repairing a Turkish-Centric Small Language Model for Multilingual Evaluation (Öztürk et al., MRL 2026)
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PDF:
https://aclanthology.org/2026.mrl-1.2.pdf