NeurIPS 2026 论文列表

Conference on Neural Information Processing Systems

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6,437篇论文

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U-Bench: A Comprehensive Understanding of U-Net through 100-Variant Benchmarking

Fenghe Tang, Chengqi Dong, Wenxin (Wendy) Ma, Zikang Xu, Heqin Zhu, Zihang Jiang, Rongsheng Wang, Yuhao Wang, Chenxu Wu, Yingtai Li, S. Kevin Zhou

展开摘要

Over the past decade, U-Net has been the dominant architecture in medical image segmentation, leading to the development of thousands of U-shaped variants. Despite its widespread adoption, there is still no comprehensive benchmark to systematically evaluate their performance and utility, largely because of insufficient statistical validation and limited consideration of efficiency and generalization across diverse datasets. To bridge this gap, we present U-Bench, the first large-scale, statistically rigorous 2D benchmark that evaluates 100 U-Net variants across 28 datasets and 10 imaging modalities. Our contributions are threefold: (1) Comprehensive Evaluation: U-Bench evaluates models along three key dimensions: statistical robustness, zero-shot generalization, and computational efficiency. We introduce a novel metric, U-Score, which jointly captures the performance-efficiency trade-off, offering a deployment-oriented perspective on model progress. (2) Systematic Analysis and Model Selection Guidance: We summarize key findings from the large-scale evaluation and systematically analyze the impact of dataset characteristics and architectural paradigms on model performance. Based on these insights, we propose a model advisor agent to guide researchers in selecting the most suitable models for specific datasets and tasks. (3) Public Availability: We provide all code, models, protocols, and weights, enabling the community to reproduce our results and extend the benchmark with future methods. In summary, U-Bench not only exposes gaps in previous evaluations but also establishes a foundation for fair, reproducible, and practically relevant benchmarking in the next decade of U-Net-based segmentation models. The weights, datasets, and results will be released after the acceptance.

Poster
TwinPrune: Density-Aware Two-Phase Token Pruning for Vision-Language Models

Kai Liu, Anqi Li, Junxian Li, Zhixin Wang, Zhikai Chen, Renjing Pei, Yulun Zhang

展开摘要

We propose a unified spatial-density signal that scores token importance for \emph{both} phases of inference, instantiated as a bipartite merge during prefill and a KV eviction during decode, with measurable gains in each phase. To verify the two phases independently, we partition benchmarks into two diagnostic roles by their scoring rule. \emph{Prefill probes} such as MMBench, POPE, and ScienceQA score only the first decoded token, so their accuracy reflects only the argmax of prefill logits, computed before any decode-phase KV eviction takes effect. \emph{Full-pipeline probes} such as TextVQA, DocVQA, and MM-Vet score the full decoded sequence and therefore reveal both phases. We expose a fundamental evaluation flaw: published claims of decode-phase token pruning validated only on prefill probes have measured prefill quality, not decode quality. Empirically, removing all visual KV at decode leaves prefill-probe accuracy essentially unchanged while collapsing TextVQA and MM-Vet by tens of points, and the insensitivity is a property of the scoring rule, not of the compression strength. Across seven model variants from the InternVL-3.5, Qwen3-VL, and LLaVA-1.5 families and the three full-pipeline-probe benchmarks, we deliver an honest three-axis Pareto over compute, memory, and accuracy. Density-based prefill compression is competitive on the accuracy frontier, scales linearly in the visual-token count, and is roughly two orders of magnitude faster in token selection at high resolution. On the decode side, density top-$k$ KV eviction wins every TextVQA and MM-Vet cell against the strongest published baselines H2O, SnapKV, and StreamingLLM across three keep ratios. The advantage widens to $9.6$ percentage points over H2O at $12.5\%$ keep on TextVQA and holds $7$ to $10$ percentage points across the InternVL-3.5 series from 2B to 38B. Compression also scales gracefully with model size: every matched 8B-to-38B transition we measure reduces, rather than amplifies, the accuracy loss. We recommend MM-Vet or DocVQA as the minimum full-pipeline-probe test for any decode-phase claim. Our code and model will be released soon.

Poster
Training Vision Transformers to Focus: Emergence of Attention Head Specialization

Yuji Nozawa, Yu-Chieh Lin, Youyang Ng

展开摘要

Unsupervised learning in Vision Transformer models, such as DINO, enables robust visual perception without requiring labeled data by leveraging large-scale image datasets. However, these models lack a focusing mechanism during training, resulting in perceptual representations that are often ambiguous or overly similar. In this work, we introduce two visual focusing loss functions designed to establish correspondences between the model's attention and specific regions within images. Specifically, we leverage the multi-head attention mechanism within the model to selectively steer the model's focus, leading to the emergence of multiple, diverse, and focused perceptual capabilities without requiring supervision. Through both qualitative and quantitative evaluations, we demonstrate that our method substantially increases the spatial selectivity and diversity of attention heads, improving both explainability and fine-grained recognition performance.

Poster
ToolCUA: Towards Optimal GUI-Tool Path Orchestration for Computer Use Agents

Xuhao Hu, Xi Zhang, Haiyang Xu, Kyle Qiao, Jingyi Yang, Xuanjing Huang, Jing Shao, Ming Yan, Jieping Ye

展开摘要

Computer Use Agents (CUAs) can act through both atomic GUI actions ($\textit{e.g., click, type}$) and high-level tool calls ($\textit{e.g., API-based file operations}$), but they are often confused by this hybrid action space: they do not know when to continue with GUI actions and when to switch to tools, and finally fail to select the optimal execution path. We view this orchestration problem as GUI-Tool path selection: deciding when the agent should continue with GUI actions and when it should switch to tool calls to form an effective execution trajectory. This difficulty stems from two issues. First, high-quality interleaved GUI-Tool trajectories are scarce, and collecting real tool trajectories is expensive and brittle. Second, existing supervision provides limited guidance for GUI-Tool path selection, as most methods focus on step-level action imitation or final task completion and offer little trajectory-level feedback on whether GUI-Tool switching leads to a more effective execution path. In this paper, we propose $\textbf{ToolCUA}$, an end-to-end agent designed to learn optimal GUI-Tool path selection through a staged training paradigm. We first introduce an $\textbf{Interleaved GUI-Tool Trajectory Scaling Pipeline}$ that repurposes abundant static GUI trajectories and synthesizes a grounded library of tools, making it possible to scale diverse GUI-Tool trajectories without manual engineering or real tool-trajectory collection.Based on this data, we perform Tool-Bootstrapped GUI RFT, which combines warmup SFT with single-turn RL to improve decisions at critical GUI-Tool switching points. Finally, we further optimize ToolCUA with $\textbf{Online Agentic RL}$ in a high-fidelity GUI-Tool environment, using a Tool-Efficient Path Reward that encourages both appropriate tool use and shorter execution paths. Experiments on OSWorld-MCP show that ToolCUA achieves 46.85% accuracy and outperforms the baseline by over 60% relatively, establishing a new state of the art among models of comparable scale. It also improves by 3.9% over GUI-only settings, demonstrating effective GUI-Tool orchestration. The results further suggest that training in a hybrid action space is a promising paradigm for real-world digital agents.

Poster
THEIA: A Multimodal Dataset and Benchmark for Vision-Language Analysis of Layout

Giuseppe Chiari, Michele Piccoli, Federico Viola, Davide Zoni

展开摘要

The integration of artificial intelligence into computer-aided design frameworks has sparked a shift in the design of analog integrated circuits (ICs), transitioning the field from using manual and algorithmic-based solutions to adopting automated and intelligent paradigms. In this scenario, the GDSII file represents the industry-standard database containing the ultimate and most accurate source of information of the analog circuit, encapsulating the complex physical geometries and parasitic realities that define tape out performance. This paper proposes THEIA, a novel dataset containing thousands of layout images paired with question-answer conversations, along with a benchmark that employs a fine-tuned vision-language model (VLM) to analyze GDSII files of analog circuits, enabling designers to interact with and query physical layouts as intuitive, meaningful entities. Experimental results using thousands of analog designs across five realistic tasks demonstrate that the proposed fine-tuned VLM outperforms state-of-the-art general-purpose VLMs by a significant margin (up to 73%), highlighting a fundamental gap between general-purpose multimodal reasoning and domain-specific layout understanding.

Poster
TED: Text-Axis Evidence Decomposition for Prompted Anomaly Localization

Jinyoung Kim, Geonho Kim, GiJeong Park, Geonu Lee, YoungJoon Yoo

展开摘要

CLIP is a powerful vision-language model, but it was not designed for fine-grained defect localization; CLIP-based anomaly detectors therefore adapt it with prompts or lightweight modules to increase defect sensitivity. We show that stronger sensitivity does not necessarily make local evidence reliable: under domain shift, adapted CLIP-AD models often assign high anomaly scores to both true defects and visually complex normal regions. The issue is not simply missing defect information, but a local scoring rule that decodes defect and hard-normal evidence, having the same anomaly evidence. We propose \textsc{TED} (Text-Axis Evidence Decomposition), a post-hoc scoring method that asks whether each ambiguous response is better supported by source defect patches or by source normal patches mistaken as anomalous. \textsc{TED} compares these supports under the host's normal-versus-anomaly text response, leaves the backbone and prompts unchanged, and requires no target-domain training. It works as a train-free score for raw VLM backbones or as a source-calibrated residual correction for adapted CLIP-AD hosts. Across frozen VLM backbones, \textsc{TED} substantially improves pixel-level localization over raw prompt similarity; across adapted hosts, it improves most pixel-level settings over P-AUROC, P-PRO, and P-AP. Gains are largest under stronger hard-FP competition, with mean localization gain increasing from $+5.0$ in low-competition regimes to about $+10.9$ in mid/high-competition regimes. These results suggest that recoverable defect evidence can already exist in pretrained multimodal representations, but reliable localization requires decoding it against hard-normal competitors.

Poster
SynIB: Informational Bottleneck for Maximizing Synergy in Multimodal Learning

Konstantinos Kontras, Teodora Popordanoska, Thomas Strypsteen, Christos Chatzichristos, Matthew Blaschko, Maarten De Vos, Paul Liang

展开摘要

A central objective in multimodal learning is to capture synergy: task-relevant information that arises only from the joint use of multiple modalities, and is not available from any single modality alone. While most approaches operate at the architectural level through larger or more complex fusion models, we propose a complementary axis: shaping the training objective itself. Standard training often emphasizes unimodal or redundant information, falling short on examples that require cross-modal reasoning. We formalize multimodal synergy through information theory and introduce the Synergistic Information Bottleneck (SynIB), a scalable objective that targets synergy directly. To prioritize learning synergy, SynIB motivates the model to predict accurately from all modalities while penalizing confidence when information from any modality is withheld. Alongside the standard task loss, the model runs forward passes with one modality masked at a time and is penalized for remaining confident, which would indicate reliance on unimodal cues rather than cross-modal interactions. We validate SynIB in two regimes. On synthetic XOR tasks where the ground-truth synergy is known by construction, standard training fails to recover it while SynIB does. On five real-world benchmarks, including three MultiBench affective tasks, Hateful Memes with CLIP-ViT and DeBERTa backbones, and a controllable irony extension of CREMA-D we introduce, SynIB improves accuracy on synergy-dependent examples by up to 7.8\% and overall accuracy by up to 3.8\%.

Poster
SurGe: Improved Surface Geometry in Point Maps

Karim Knaebel, Gonzalo Martin Garcia, Christian Schmidt, Ilya Fradlin, Lucas Nunes, Daan de Geus, Bastian Leibe

展开摘要

With impressive progress in architectures, training recipes, and quantity of high-quality data, recent monocular geometry estimation methods estimate global 3D geometry remarkably well. However, they still exhibit surprisingly low quality on surface details, which is clearly visible in qualitative predictions but not reflected in common metrics. To improve this shortcoming, we first formulate a metric that is capable of measuring the surface quality of the estimated geometry via normals derived from the predicted point map. Furthermore, we propose two manners to improve fine-grained local geometry in monocular geometry estimation models: (i) we present an improved point-based gradient loss, and (ii) we introduce a novel decoder based on neighborhood attention. We evaluate our proposed method on eight common zero-shot monocular geometry estimation benchmarks and achieve state-of-the-art results, particularly improving local surface geometry. Extensive ablations validate our design choices. Code and models will be open-sourced.

Poster
Stable3R: Streaming 3D Reconstruction with Stable Geometric References

Jincheng Xiong, Jiarong Han, Hang Zhang, Mu Xu, Ming Qian

展开摘要

Streaming 3D reconstruction has become a critical component for real-time applications. While recent advances have adapted large-scale offline feedforward models into streaming architectures via causal attention and KV-caching, they suffer from fundamental instability: the irreversible bias in early frames. This limitation stems from two coupled factors: (1) the existing KV-cache-based causal architecture strictly prohibits access to future information, resulting in information-poor early caches; and (2) current methods typically anchor the pose constraints to the initial frame, amplifying the early bias throughout the sequence. To address these challenges, we propose Stable3R, a holistic framework that establishes stable geometric references by enriching historical caches and anchoring poses to prefixes rather than a single initial frame. Specifically, we first introduce a lookahead-augmented attention mechanism, integrating future observations into past caches without violating causal constraints. Second, we adopt a frame-equivariant architecture with prefix-relative supervision, alleviating the reliance on the biased initial frame. Extensive experiments across multiple benchmarks show that our method consistently boosts reconstruction quality within a strictly causal inference schedule.

Poster
Semantic Consistency of Vision Tokens: A Vision-Centric Perspective on Multimodal Large Language Models

Nikola Đukić, Tim Lebailly, Tinne Tuytelaars

展开摘要

In the computer vision world, vision-language and self-supervised encoders represent two unique paradigms characterized by global language alignment and high-quality vision-only patch representations, respectively. Multimodal large language models (MLLMs) often use the former because of language alignment, despite the recent rise in vision-centric tasks resembling traditional dense vision tasks that would likely benefit from the high-quality patch representations of the latter. This raises the question whether self-supervised models could aid MLLMs in vision-centric tasks. To investigate this, we define the concept of semantic (in)consistency of patch tokens produced by language-aligned encoders and identify two sets of tokens, semantically consistent (SCTs) and semantically inconsistent (SITs). Through systematic probing via the removal of SCTs or SITs from the input of modern MLLMs, we show higher reliance on SCTs than SITs, as removal of the former induces larger performance drops. This demonstrates that MLLMs benefit from semantic consistency of vision tokens. With this in mind, we devise a simple yet effective extension of the MLLM training objective that combines traditional language modeling with semantic guidance via minimization of semantic inconsistency of vision tokens. This strategy, named Semantically-Guided Training (SGT), combines the signals of both loss terms to push the vision encoder towards providing semantically consistent tokens, while preserving language alignment. Through extensive evaluation, we show that SGT drastically outperforms all baselines and MLLMs with specialized vision encoders on all vision-centric benchmarks while keeping strong scores on text-centric benchmarks, thus setting state of the art when averaged across all tasks. Our results highlight the importance of combining language alignment and semantic consistency through the lens of MLLMs rather than independently from them and pave the way towards the design of better MLLM vision encoders.

Poster
Selection, Not Fusion: Radar-Modulated State Space Models for Radar-Camera Depth Estimation

Zhangcheng Hou, Tomoaki Ohtsuki

展开摘要

Radar-camera depth estimation must turn an ultra-sparse, all-weather, metric radar signal into a dense per-pixel depth map. Existing methods --- concatenation, confidence-aware gating, sparse supervision, graph-based extraction --- combine radar and image features outside the backbone's sequence operator, and even cross-modal Mamba variants leave the selection mechanism itself unimodal. We argue that the selection mechanism is the right place for radar to enter. We introduce Radar-Modulated Selection (RMS), a minimal and principled way to inject radar into Mamba's selective scan: radar modulates the scan from within, adding zero-initialised perturbations to the step size $\boldsymbol{\Delta}$ and readout $\mathbf{C}$ while leaving the input projection $\mathbf{B}$ and state dynamics $\mathbf{A}$ image-only. The construction is exactly equivalent to a pretrained image-only Mamba at initialisation, ensuring radar only influences the model where it improves accuracy. Two further properties follow that out-of-scan fusion cannot offer: linear-cost cross-modal coupling at every recurrence step, and a natural fallback to the image-only backbone when radar is absent. We deploy RMS in a Multi-View Scan Pyramid (MVSP) that matches the fusion operator to radar's spatial reach at each scale. SemoDepth achieves state-of-the-art performance on nuScenes, reducing MAE by 34.0%, 29.9%, and 29.9% over the previous best at 0-50, 0-70, and 0-80 m, while attaining the lowest single-frame latency (26.8 ms). A further ablation shows that out-of-scan feature blending adds no accuracy on top of RMS, providing empirical validation that in-scan selection can replace out-of-scan fusion.

Poster
See it to Place it: Evolving Macro Placements with Vision Language Models

Ikechukwu Uchendu, Swati Goel, Karly Hou, Ebrahim Songhori, Kuang-Huei Lee, Wenjie (Joe) Jiang, Vijay Janapa Reddi, Vincent Zhuang

展开摘要

We propose using Vision-Language Models (VLMs) for macro placement in chip floorplanning, a complex optimization task that has recently shown promising advancements through machine learning methods. Because human designers rely heavily on spatial reasoning to arrange components on the chip canvas, we hypothesize that VLMs with strong visual reasoning abilities can effectively complement existing placement algorithms. We introduce VeoPlace (Visual Evolutionary Optimization Placement), a novel framework that uses a VLM—without any fine-tuning—to guide the actions of a base placer by constraining them to subregions of the chip canvas. The VLM proposals are iteratively optimized through an evolutionary search strategy with respect to resulting placement quality. Using global half-perimeter wirelength (gHPWL) after standard-cell placement and legalization as the evaluation metric, VeoPlace boosts ChiPFormer performance on 9 of 10 benchmarks with peak reductions exceeding 32%. We further demonstrate that VeoPlace generalizes to analytical placers, improving DREAMPlace on all 8 evaluated Superblue benchmarks with gains up to 4.3%. Our approach opens new possibilities for electronic design automation tools that leverage foundation models to solve complex physical design problems.

Poster
ScreenSearch: Uncertainty-Aware OS Exploration

Michael Solodko, Justin Wagle

展开摘要

Desktop GUI agents operate under partial observability: visually similar screens can correspond to different underlying workflow states, so locally plausible actions can lead to sharply different outcomes. We frame this as a problem of computer/OS state exploration, where effective behavior requires both expanding the reachable frontier and reducing ambiguity before committing. We present ScreenSearch, a system that combines structural screen retrieval and deduplication with an ambiguity-aware PUCT graph-bandit for large-scale desktop exploration. The retrieval layer converts UIA trees into location-aware structural features, indexes related screens through sparse token search and metadata filters, and maintains a shared deduplicated state graph across VM workers. On top of this graph, we define a scalable ambiguity signal based on matched-action outcome dispersion. If similar screens produce different next states under the same action signature, the state should be probed further rather than treated as resolved. We use this signal together with frontier rewards to drive large-scale exploration and replay-start policy evaluation over the shared graph. Across 11 desktop applications, ScreenSearch collects over 1M screenshots and over 30K deduplicated states, yielding large exploration corpora with substantial cross-application and within-application diversity. On a fixed replay-start slice, we observe a clear novelty--ambiguity trade-off: some policies reduce ambiguity quickly while discovering little frontier. Ambiguity reduction alone is therefore not a sufficient exploration objective. Appendix ablations show that stronger proposal priors can materially improve unique-state discovery during corpus building. These results suggest that state identity, proposal quality, and ambiguity-aware search all matter when deciding when to probe and when to commit.

Poster
SchemaPose: RGB-Based Category-Level Pose Estimation with Parametric Category Schema

Shuang Wu, Jiude Wei, Cewu Lu, Jianhua Sun

展开摘要

RGB-based category-level 9D pose estimation remains highly challenging because a monocular system must generalize across unseen object instances while jointly inferring 3D translation, 3D rotation, and 3D size. Unlike instance-level pose estimation, the category-level setting requires the network to learn both what is shared across objects within a category and how individual instances vary in structure. This challenge is amplified in the RGB-only setting, where pose cues, category-level commonality, and instance-specific variation are entangled in appearance without direct geometric constraints, making it difficult for existing frameworks to learn a representation that is truly aligned with the category-level estimation objective. To address this problem, we propose SchemaPose, a schema-guided framework for RGB-based category-level pose estimation. SchemaPose equips the estimation pipeline with an explicit parametric schema for modeling category-level regularities together with structured instance variation, and uses the inferred schema variables to guide pose-related prediction in an end-to-end query-based framework. The same formulation also supports template instantiation, synthetic annotation, and pose learning within a unified framework. Experiments on synthetic and real data show that SchemaPose achieves state-of-the-art performance among RGB-based methods for category-level 9D pose estimation.

Poster
SceneAligner: 3D-Grounded Floorplan Localization in the Wild

Junhyeong Cho, Ruojin Cai, Hadar Averbuch-Elor

展开摘要

Many public buildings provide floorplans with a “you are here” indicator to help visitors orient themselves. Floorplan localization seeks to computationally replicate this capability by determining where visual observations were captured within a floorplan. However, existing methods typically assume controlled small-scale environments and precise vectorized floorplans, limiting their ability to operate in large-scale buildings and rasterized floorplans. In this work, we present an approach for performing floorplan localization in the wild by grounding the task in a reconstructed 3D representation of the scene. Given an unconstrained image collection, our method reconstructs a gravity-aligned 3D scene and projects it into a 2D density map that serves as a floorplan proxy. Floorplan localization is then formulated as aligning this proxy with the input floorplan via a 2D similarity transform. To bridge the appearance gap between density maps and architectural floorplans, we adapt a 2D foundation model to learn cross-modal correspondences, introducing a fine-tuning scheme that encourages semantically aligned matches while preserving structural consistency. Extensive experiments demonstrate substantial improvements over prior methods, including in extremely sparse settings with as little as a single input image. Our code and data will be publicly available.

Poster
SatNav: A Scalable Benchmark for Long-Horizon UAV Vision-Language Navigation from Satellite Imagery

Jiajun Jiang, Chunliang Hua, Zichun Chen, Yanxing Wu, Zeyuan Yang, Jie Song, Xiao Hu

展开摘要

Urban uncrewed aerial vehicle (UAV) vision-language navigation (VLN) requires agents to follow instructions across extended urban spaces, inherently demanding long-term memory and geospatial grounding. However, scaling existing benchmarks remains difficult because of their reliance on costly reconstructed 3D assets, limiting geographic diversity and episode scale. To address this, we introduce SatNav, a scalable, long-horizon UAV VLN benchmark built from high-resolution satellite imagery. SatNav targets city-level navigation missions and uses satellite crops as approximations of UAV nadir views for visual observations. Through an automated cue-to-episode pipeline, SatNav constructs 118K episodes from 59 scenes across 18 cities, with an average trajectory length of 379 m. To stress-test long-horizon memory and geospatial reasoning, SatNav defines three task families: Boundary, Landmark, and Route, targeting loop progress tracking, landmark-based spatial grounding, and route following with counting cues. Benchmarking classical and recent large vision language model (LVLM) based VLN agents on SatNav shows that city-scale navigation remains challenging. We further introduce SwiftVLN, a modular framework with switchable memory components, and conduct systematic memory-design ablations. Finally, satellite-to-UAV transfer experiments show that satellite-trained navigation models can operate on real-flight UAV observations, showing the practical relevance of SatNav.

Poster
SOAR: Regression-based LiDAR Relocalization for UAVs

Hengyu Mu, Jianshi Wu, Yuxin Guo, XianLian Lin, Qingyong Hu, Sheng Ao, Chenglu Wen, Cheng Wang

展开摘要

Regression-based LiDAR relocalization has recently emerged as a promising solution for high-precision positioning in GNSS-denied environments. However, these methods are primarily tailored to autonomous driving, exhibiting significantly degraded accuracy in unmanned aerial vehicle (UAV) scenarios due to arbitrary pose variations and irregular flight paths. In this paper, we propose SOAR, a regression-based LiDAR relocalization framework for UAVs. Specifically, we introduce a locality-preserving sliding window attention module with locally invariant positional encoding to capture discriminative geometric structures robust to viewpoint changes. A coordinate-independent feature initialization module is further designed to eliminate sensitivity to global transformations. Furthermore, most existing UAV datasets are limited to evaluate LiDAR relocalization in real-world, due to the lack of synchronized LiDAR scans, accurate 6-DoF poses, or multiple traversals. Thus, we construct a large-scale UAV LiDAR localization dataset with 4 scenes and 13 irregular paths exhibiting rotation and altitude variations, providing a more realistic benchmark for UAVs. Extensive experiments demonstrate that our method achieves state-of-the-art performance, improving the localization success rate by 40\% and reducing mean error over 10m on UAVLoc. Our code and dataset will be released soon, and the dataset demo is available via the anonymous link.

Poster
SING-CH: Task-Scale-Agnostic Lifelong Cross-Modal Hashing on Statistical Manifolds

Haoran Yang, Junge Chen, Jun Long, Zhan Yang

展开摘要

Lifelong cross-modal hashing demands incremental updates as new tasks arrive, yet existing regularization-based methods such as EWC and SI share a fundamental weakness: their effective regularization strength is entangled with task scale, as the empirical Fisher Information Matrix (FIM) scales linearly with sample size. This forces costly per-task hyperparameter tuning in streaming deployments to avoid over- or under-regularizing tasks of varying sizes. We propose \textsc{Sing-CH}, a lifelong hashing framework built on information geometry. At its core is a Gibbs probabilistic reconstruction of the pairwise objective, which gives the parameter space a statistical manifold structure and yields a natural $1/n_t^2$ normalization. We prove this normalization renders the FIM scale-agnostic: its spectral properties remain independent of task size even under diagonal and K-FAC approximations. Beyond this invariance, a Forgetting-Rigidity trade-off theorem shows that natural gradient applied to the composite objective reintroduces scale dependence. This makes our decoupled design, pairing the FIM as regularizer with Adam for optimization, a structural necessity rather than a convenience. Experiments on three benchmarks demonstrate that \textsc{Sing-CH} outperforms 11 baselines by 4.1\% average mAP without per-task tuning. Under extreme task-scale imbalance, degradation is only 2.0\% versus 3.9\% for the strongest baseline, providing the first empirically grounded solution to scale-agnostic lifelong retrieval.

Poster
SAM 3D Animal: Promptable Animal 3D Reconstruction from Images in the Wild

Xuyi Hu, Jin Lyu, Jiuming Liu, Yebin Liu, Silvia Zuffi, Liang An, Stefan Goetz

展开摘要

3D animal reconstruction in the wild remains challenging due to large species variation, frequent occlusions, and the prevalence of multi-animal scenes, while existing methods predominantly focus on single-animal settings. We present SAM 3D Animal, the first promptable framework for multi-animal 3D reconstruction from a single image. Built on the SMAL+ parametric animal model, our method jointly reconstructs multiple instances and supports flexible prompts in the form of keypoints and masks which enable more reliable disambiguation in crowded and occluded scenes. To train such a model, we further introduce Herd3D, a multi-animal 3D dataset containing over 5K images, designed to increase diversity in species, interactions, and occlusion patterns. Experiments on the Animal3D, APTv2, and Animal Kingdom datasets show that our framework achieves state-of-the-art results over both existing model-based and model-free methods, demonstrating a scalable and effective solution for prompt-driven animal 3D reconstruction in the wild.

Oral
Robustness of Internal Signals for Hallucination Detection in Vision-Language Models

Allison Chen, William Yang, Salma Abdel Magid, Jonathan Williams, Olga Russakovsky, Esin Tureci

展开摘要

When given an image and a text prompt, vision-language models (VLMs) can produce seemingly sophisticated text responses. However, they are also prone to hallucinate objects in their output, which can have detrimental consequences in safety-critical applications. To detect these hallucinations, certain methods interestingly leverage internal signals from the VLM as it generates the text response; potentially, these methods use the same signals that led to a hallucination to detect it. We conduct an in-depth analysis to understand the robustness of these detection methods. First, we show that a naive baseline of a generated word's \emph{token position} in the VLM text response achieves competitive performance. Further, we reveal how some detection methods \emph{rely} on token position and use this heuristic as a shortcut. Second, we explore detection methods' sensitivity to language and vision modalities. Our experiments suggest that strong detection performance is often driven by detecting language-based hallucinations, and when methods rely on token position, they tend to be less visually grounded and exhibit reduced robustness when hallucinations occur earlier in a text response. Lastly, we demonstrate that different detection methods can carry complementary signals; when ensembling methods together, adding weaker methods to an ensemble of higher performing ones still offers performance improvements. Altogether, while there may be useful internal VLM signals to detect hallucinations, our investigation reveals important limitations of the current methods that try to leverage them.

Poster