UniMoE-Audio: Unified Speech and Music Generation with Dynamic-Capacity
  MoE
Authors: name: Zhenyu Liu, name: Yunxin Li, name: Xuanyu Zhang, name: Qixun Teng, name: Shenyuan Jiang, name: Xinyu Chen, name: Haoyuan Shi, name: Jinchao Li, name: Qi Wang, name: Haolan Chen, name: Fanbo Meng, name: Mingjun Zhao, name: Yu Xu, name: Yancheng He, name: Baotian Hu, name: Min Zhang
Organization: Lychee Team

Recent advances in unified multimodal models indicate a clear trend towards
comprehensive content generation. However, the auditory domain remains a
significant challenge, with music and speech often developed in isolation,
hindering progress towards universal audio synthesis. This separation stems
from inherent task conflicts and severe data imbalances, which impede the
development of a truly unified audio generation model. To address this
challenge, we propose UniMoE-Audio, a unified speech and music generation model
within a novel Dynamic-Capacity Mixture-of-Experts (MoE) framework.
Architecturally, UniMoE-Audio introduces a Top-P routing strategy for dynamic
expert number allocation, and a hybrid expert design comprising routed experts
for domain-specific knowledge, shared experts for domain-agnostic features, and
null experts for adaptive computation skipping. To tackle data imbalance, we
introduce a three-stage training curriculum: 1) Independent Specialist Training
leverages original datasets to instill domain-specific knowledge into each
"proto-expert" without interference; 2) MoE Integration and Warmup incorporates
these specialists into the UniMoE-Audio architecture, warming up the gate
module and shared expert using a subset of balanced dataset; and 3) Synergistic
Joint Training trains the entire model end-to-end on the fully balanced
dataset, fostering enhanced cross-domain synergy. Extensive experiments show
that UniMoE-Audio not only achieves state-of-the-art performance on major
speech and music generation benchmarks, but also demonstrates superior
synergistic learning, mitigating the performance degradation typically seen in
naive joint training. Our findings highlight the substantial potential of
specialized MoE architecture and curated training strategies in advancing the
field of universal audio generation. Homepage:
https://mukioxun.github.io/Uni-MoE-site/home.html