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Tiancheng Shen

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#artificial intelligence Review Oct 2026

Getting Space Right: Agentic Rewards for Image Generation

Reinforcement learning (RL) is promising for spatial text-to-image generation, but existing work largely focuses on policy optimization, assuming accurate rewards and effective online rollouts. We observe in-domain gains with out-of-domain degradation, exposing two limitations: unreliable spatial rewards in open-world...

Xiao-Feng Tan, Jia-Xin Lin, Haobo Yuan et al. · 0 citations
Preprint Sep 2026

LeRF: Learning Reference Coordinate Frames for Perspective Taking Reasoning

Learning Reference Coordinate Frames for Perspective Taking is introduced, a framework that trains VLMs to construct and use explicit reference frames for viewpoint-dependent reasoning and consistently improves over its backbone and achieves strong performance against existing open-source methods.

Bang Xiao, Wen-Qi Jia, Ozgur Kara et al. · 0 citations
Preprint Aug 2026

Dual-Grained Agent Memory and Shapley Context Attribution for Multimodal Agentic Learner

DG-Mem is proposed, a dual-grained agentic memory framework that augments a frozen MLLM with a non-parametric, externally stored memory built once from training-time rollouts and consulted read-only at test time, and improves consistently over no-memory and competitive memory baselines.

Jie-Ke Wang, Tian-Cheng Shen, Yibo Yang et al. · 0 citations

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