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

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Summary

CogniRoute is a schema-guided Mixture-of-Experts framework for social video question answering that improves multimodal reasoning through cognitive schema factorization and route-aware reinforcement learning. It achieves significant gains over baselines on the new OmniSocialBench benchmark.

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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Abstract

CogniRoute is a schema-guided Mixture-of-Experts framework for social video question answering that improves multimodal reasoning through cognitive schema factorization and route-aware reinforcement learning.

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, aschema-guidedMixture-of-Expertsframework for social omni reasoning. CogniRoute uses a training-only cognitive schema that factorizes each example bycross-modal relation,reasoning demand, andtemporal scope, and alignsglobal routing signatureswith this structure duringsupervised fine-tuning. We further introduceroute-aware reinforcement learning, which jointly optimizes token generation and expert allocation using rewards foranswer correctness,modality-consistent reasoning, andcognitive temporal grounding. To support training and evaluation, we constructOmniSocialBench, a diagnostic social video QA resource with 118Kstructured training examples,grounded reasoning traces, schema labels,temporal evidence spans, and a manually verified evaluation split. CogniRoute achieves 59.38\% average accuracy onOmniSocialBench, 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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