IndoDialect: A Multi-Dialect Conversational Dataset for Indonesian Local Languages

Salsabila Zahirah Pranida, Thamar Solorio, Fajri Koto


Abstract
Dialectal variation is a defining characteristic of many low-resource languages, yet most NLP approaches overlook this complexity—often assuming uniformity or arbitrarily selecting a single variant without reporting which dialect is used. This assumption severely limits the applicability of language technologies in real-world communication, especially for languages without unified orthography where dialects could differ in vocabulary and morphology. In this paper, we present the first comprehensive study of dialect processing for Indonesian local languages, a linguistically rich and underrepresented setting. We introduce IndoDialect, a high-quality conversational dataset comprising 14.2K conversations across four major local languages and eleven dialects, including five Javanese, two Minangkabau, two Sundanese, and two Dayak dialects. Building on this resource, we define three core tasks: (i) dialect-level language identification, (ii) machine translation across dialects, and (iii) dialect-controlled generation. Our experiments reveal that state-of-the-art multilingual models perform poorly in few-shot scenarios, excel at dialect identification after fine-tuning, but struggle with machine translation and dialect-controlled generation.
Anthology ID:
2026.emnlp-main.978
Volume:
Proceedings of the 2026 Conference on Empirical Methods in Natural Language Processing
Month:
October
Year:
2026
Address:
Budapest, Hungary
Editors:
Hung-Yi Lee, Sunipa Dev, Jessy Li, Desmond Elliott
Venue:
EMNLP
SIG:
SIGDAT
Publisher:
Association for Computational Linguistics
Note:
Pages:
22570–22591
Language:
URL:
https://aclanthology.org/2026.emnlp-main.978/
DOI:
Bibkey:
Cite (ACL):
Salsabila Zahirah Pranida, Thamar Solorio, and Fajri Koto. 2026. IndoDialect: A Multi-Dialect Conversational Dataset for Indonesian Local Languages. In Proceedings of the 2026 Conference on Empirical Methods in Natural Language Processing, pages 22570–22591, Budapest, Hungary. Association for Computational Linguistics.
Cite (Informal):
IndoDialect: A Multi-Dialect Conversational Dataset for Indonesian Local Languages (Pranida et al., EMNLP 2026)
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PDF:
https://aclanthology.org/2026.emnlp-main.978.pdf