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Haggai Maron

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#natural language process... Preprint Oct 2026

Gray-Box Hallucination Detection in LLMs with Token Identities

GURI (Gray-box Uncertainty Representations with Identity), a lightweight gray-box hallucination detector that combines candidate-token probabilities with per-token vector identifiers that exposes which alternatives the model considered while preserving the accessibility and transferability of the gray-box setting.

S. Goldshtein, Yitzchak Grunbaum, Fabrizio Frasca et al. · 0 citations
#machine learning Preprint Oct 2026

Learning Cross-Model Activation Alignments with Explicit Many-to-Many Layer Maps

This work studies an activation alignment, a map from a source model's layerwise activations to a target's, and factors this map into a layer map, whose output is an explicit target-by-source matrix that can be extracted and inspected, and a layer-shared feature map between hidden spaces.

А. Ю. Судаков, Guy Bar-Shalom, Fabrizio Frasca et al. · 0 citations
#machine learning Preprint Sep 2026

Transferable Graph Metanetworks

A weight space network (or metanetwork) takes the weights of another neural network as input and predicts properties of it. Most prior work trains such models on input networks of one or a few fixed sizes and evaluates them in-distribution. The few attempts at out-of-distribution size generalization remain limited in s...

Yu-Xin Ma, A. Dayan, Yam Eitan et al. · 0 citations
#machine learning Preprint Oct 2026

CrossGMN: Graph Metanetworks for Cross-Architecture Weight-Space Transformations

Weight-space networks operate directly on parameters of other neural networks, enabling tasks such as predicting model properties, editing trained models, and generating weights. Weight-space symmetries such as neuron permutations make equivariance a key design principle. However, existing equivariant weight-space arch...

A. Dayan, Yam Eitan, Haggai Maron · 0 citations
#machine learning Preprint Sep 2026

Permutation-Equivariant Flow Matching for Alignment-Free Neural Weight Generation

This work parameterize a flow-matching velocity field with a permutation-equivariant Graph Meta Network, enabling direct learning from independently trained networks without alignment, and shows how permutation equivariance enables learning from diverse collections of independently trained networks without permutation...

Arkadi Piven, Yam Eitan, Guy Bar-Shalom et al. · 0 citations
#artificial intelligence Preprint Sep 2026

Finite Probes Suffice: Identifiability and Universality for Weight-Space Learning

This work studies when finite probe-based representations are sufficient for learning neural functionals, establishes general identification and universality results for probing, and shows that using intermediate hidden representations can provide significantly more informative representations than relying only on fina...

Soutrik Sarangi, Yonatan Sverdlov, A. Dayan et al. · 0 citations
Preprint Aug 2026

UniProbe: A Learnable Token-Level Hallucination Detector for Large VLMs using Multi-Structural Internal Representations

UniProbe is introduced, a lightweight, unified, learnable detector that models a frozen LVLM's heterogeneous computational trace from a single forward pass and achieves state-of-the-art token-level and object-hallucination detection.

Dvir Samuel, Guy Bar-Shalom, Fabrizio Frasca et al. · 0 citations

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