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arXiv

SMI uses a multimodal LLM to manage spatial memory, improving memory sparsity, generation stability, and spatial consistency in long-video world models

The work proposes Spatial Memory Intelligence (SMI), described as the first framework to systematically employ an understanding model (a multimodal large language model) for spatial-memory management in long-video world models, through four coordinated atomic operations: spatial clustering, within-cluster sparsification, action-aware retrieval, and reliability-aware filtering; experiments across multiple baselines, benchmarks, and world-model backbones report comprehensive improvements in memory sparsity, generation stability, and spatial consistency, supporting effectiveness and generalizability.