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Yusuke Iwasawa

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#artificial intelligence Preprint Sep 2026

AutoRef: Harness Optimization for Agentic Multi-Reference Image Generation

Recent image generation models can take multiple reference images as input and combine them into a new image. However, multi-reference image generation remains challenging: models may omit or duplicate subjects from the references, or produce images in which multiple subjects appear unnaturally pasted. Recent work has...

Yuta Oshima, Ku Onoda, Yusuke Iwasawa et al. · 0 citations

SAIL: Test-Time Scaling for In-Context Imitation Learning with VLM

SAIL is a framework that reframes robot imitation as an iterative refinement problem capable of scaling with test-time compute, and utilizes Monte Carlo Tree Search, where each node is a complete trajectory and edges correspond to trajectory refinements.

Makoto Sato, Yusuke Iwasawa, Yu-Jin Tang et al. · 2 citations
#artificial intelligence Preprint Sep 2026

Few-Shot Demonstrations Elicit the Use of In-Context World Representations in LLMs

Large language models (LLMs), when acting as agents, are expected to take observed data in context, infer the latent state space underlying the world, and leverage it for downstream prediction. However, prior work demonstrated that LLMs struggle to use representations learned in context on a graph tracking task, where...

Kohsei Matsutani, Gouki Minegishi, C. Park et al. · 0 citations
#artificial intelligence Preprint Sep 2026

Improving Cross-embodiment Transfer in Latent Action Models with Action-Similarity Supervision

This work evaluates cross-embodiment transfer on RoboTwin 2.0 in a controlled setup, two bimanual robots demonstrate disjoint task sets, a policy is trained on all the demonstrations, and each robot is evaluated closed-loop on the tasks only the other demonstrated.

Maxime Alvarez, Renzo Caballero, T. Matsushima et al. · 0 citations
Open access Aug 2026

Auditing Instruction–Trajectory Mismatches in Multimodal Robot Demonstrations

Robot demonstration datasets used to train vision-language-action policies can contain a subtle but harmful failure mode: trajectories that are behaviorally correct but paired with the wrong language instruction. We study post-hoc auditing of these Instruction–Trajectory Mismatches (ITMs). Unlike failed rollouts, ITMs...

Simon Holk, Ryosuke Takanami, T. Matsushima et al. · 0 citations
Preprint Aug 2026

DREAM: Deployment-Time Demonstration Generation via Real-to-Sim for Scalable Policy Adaptation

DREAM is presented, a framework that generates fine-tuning data for a pretrained VLA from a captured workspace and a language instruction, without requiring a task-specific human demonstration, and whether it can serve as a scalable data-collection system for the deployment workspace.

Makoto Sato, T. Matsushima, Yutaka Matsuo et al. · 1 citation
Preprint Jul 2026

CHASE: Cache-Hole-Adapted Skip Exit for Looped State-Space Language Models

Recent work on looped language models suggests that many reasoning problems benefit from greater computational depth rather than from additional independent parameters. Existing studies, however, focus almost exclusively on Transformer backbones, leaving open whether this principle also applies to state-space language...

Zhen-Xuan Yu, Takeshi Kojima, Yutaka Matsuo et al. · 0 citations
#small language model Preprint Sep 2026

MINERVA: How Small Can a Manipulation Policy Be and Still Solve LIBERO?

Vision-language-action (VLA) models with billions of parameters now dominate the LIBERO manipulation benchmark, but the model capacity actually required by the benchmark remains unclear. We introduce MINERVA (MINimal Efficient Robotic Vision-Action policy), a family of deliberately compact visuomotor policies designed...

Kohei Sendai, T. Matsushima, Yusuke Iwasawa · 3 citations · ⚡1
Preprint Aug 2026

Batch-wise Adaptive Pruning: Periodic Neuron Activation-Aware Weight Pruning for Language Reasoning Model

A training-free adaptive pruning method designed specifically for batched inference in LRMs, built on two components: periodic top-k selection over the aggregated importance scores, unaffected by the shift that aggregation induces in the activation distribution, and based on the observation that important neurons re-fi...

Yongmin Kim, Shota Takashiro, Yusuke Iwasawa et al. · 0 citations

Zipping the Thought: When and How Compressed Reasoning Data Works in LLM Post-Training

A taxonomy of CoT is proposed consisting of Explicit CoT, which outputs all operations without aggregation, Composed CoT, which combines multiple operations into a single step, and Implicit CoT, which omits intermediate operations.

Kohsei Matsutani, Gouki Minegishi, Takeshi Kojima et al. · 1 citation
Review Aug 2026

HealMed: Multilingual Evaluation of Large Language Models in Medicine

On HealMed, performance declined most in low-resource languages, although the size of the gap varied markedly across languages and models, whereas many open-source and medically specialized models showed larger and less consistent gaps.

Yingjian Chen, Fan Gao, Sherry T. Tong et al. · 0 citations

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