CogniRoute: Learning to Route Social Evidence in Omni-Modal Models

Yifan Shen; Pei Tian; Xinzhuo Li; Bowen Fang; Shujun Xia; Bingxuan Li; Ana Jojic; Wenming Ye; Xu Cao; James Matthew Rehg; Ismini Lourentzou

arXiv · 2606.20970

CogniRoute: Learning to Route Social Evidence in Omni-Modal Models

Yifan Shen·Pei Tian·Xinzhuo Li·Bowen Fang·Shujun Xia·Bingxuan Li·Ana Jojic·Wenming Ye·Xu Cao·James Matthew Rehg·Ismini Lourentzou

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Abstract

Omni-modal models can ingest video, audio, and text, but unified access to multiple modalities does not guarantee that a model uses the right evidence. This gap is especially pronounced in social video question answering, where the answer may hinge on a gesture, vocal tone, temporal cue, or mismatch between what is said and what is visually expressed. We introduce CogniRoute, a schema-guided Mixture-of-Experts framework for social omni reasoning. CogniRoute uses a training-only cognitive schema that factorizes each example by cross-modal relation, reasoning demand, and temporal scope, and aligns global routing signatures with this structure during supervised fine-tuning. We further introduce route-aware reinforcement learning, which jointly optimizes token generation and expert allocation using rewards for answer correctness, modality-consistent reasoning, and cognitive temporal grounding. To support training and evaluation, we construct OmniSocialBench, a diagnostic social video QA resource with 118K structured training examples, grounded reasoning traces, schema labels, temporal evidence spans, and a manually verified evaluation split. CogniRoute achieves 59.38\% average accuracy on OmniSocialBench, improving over the strongest proprietary baseline by 15.33 percentage points and the strongest open-source omni baseline by 26.77 points, with the largest gains on questions requiring audio-visual coordination, conflict resolution, and temporally grounded social inference.

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Yifan Shen, Pei Tian, Xinzhuo Li, Bowen Fang, Shujun Xia, Bingxuan Li, Ana Jojic, Wenming Ye, Xu Cao, James Matthew Rehg, Ismini Lourentzou. 2026-06-18. CogniRoute: Learning to Route Social Evidence in Omni-Modal Models. https://arxiv.org/abs/2606.20970

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