TableMoE: Neuro-Symbolic Routing for Structured Expert Reasoning in Multimodal Table Understanding

TL;DR

TableMoE introduces a neuro-symbolic routing architecture that enhances multimodal table understanding by dynamically routing table elements to specialized experts, significantly improving robustness and performance on complex, degraded real-world table data.

Contribution

The paper presents a novel neuro-symbolic Mixture-of-Connector-Experts architecture with a routing mechanism and a large-scale pretraining dataset for improved structured reasoning in multimodal table understanding.

Findings

Outperforms existing state-of-the-art models on WildStruct benchmarks

Demonstrates robustness under real-world multimodal degradation

Validates the effectiveness of neuro-symbolic routing through ablation studies

Abstract

Multimodal understanding of tables in real-world contexts is challenging due to the complexity of structure, symbolic density, and visual degradation (blur, skew, watermarking, incomplete structures or fonts, multi-span or hierarchically nested layouts). Existing multimodal large language models (MLLMs) struggle with such WildStruct conditions, resulting in limited performance and poor generalization. To address these challenges, we propose TableMoE, a neuro-symbolic Mixture-of-Connector-Experts (MoCE) architecture specifically designed for robust, structured reasoning over multimodal table data. TableMoE features an innovative Neuro-Symbolic Routing mechanism, which predicts latent semantic token roles (e.g., header, data cell, axis, formula) and dynamically routes table elements to specialized experts (Table-to-HTML, Table-to-JSON, Table-to-Code) using a confidence-aware gating strategy informed by symbolic reasoning graphs. To facilitate effective alignment-driven pretraining, we introduce the large-scale TableMoE-Align dataset, consisting of 1.2M table-HTML-JSON-code quadruples across finance, science, biomedicine and industry, utilized exclusively for model pretraining. For evaluation, we curate and release four challenging WildStruct benchmarks: WMMFinQA, WMMTatQA, WMMTabDialog, and WMMFinanceMath, designed specifically to stress-test models under real-world multimodal degradation and structural complexity. Experimental results demonstrate that TableMoE significantly surpasses existing state-of-the-art models. Extensive ablation studies validate each core component, emphasizing the critical role of Neuro-Symbolic Routing and structured expert alignment. Through qualitative analyses, we further showcase TableMoE's interpretability and enhanced robustness, underscoring the effectiveness of integrating neuro-symbolic reasoning for multimodal table understanding.