In this paper, we present a neural spoken language diarization model that supports an unconstrained span of languages within a single framework. Our approach integrates a learnable query-based architecture grounded in multilingual awareness, with large-scale pretraining on simulated code-switching data. By jointly leveraging these two components, our method overcomes the limitations of conventional approaches in data scarcity and architecture optimization, and generalizes effectively to real-world multilingual settings across diverse environments. Experimental results demonstrate that our approach achieves state-of-the-art performance on several language diarization benchmarks, with a relative performance improvement of 23% to 52% over previous methods. We believe that this work not only advances research in language diarization but also establishes a foundational framework for code-switching speech technologies.
@article{arxiv.2510.00582,
title = {SAGE-LD: Towards Scalable and Generalizable End-to-End Language Diarization via Simulated Data Augmentation},
author = {Sangmin Lee and Woongjib Choi and Jihyun Kim and Hong-Goo Kang},
journal= {arXiv preprint arXiv:2510.00582},
year = {2025}
}