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Xiaomeng Fan

5 accepted papers

2026

Modality Alignment across Trees on Heterogeneous Hyperbolic Manifolds

ICLR 2026poster

Modality alignment is critical for vision-language models (VLMs) to effectively integrate information across modalities. However, existing methods extract hierarchical features from text while representing each image with a single feature, leading to asymmetric and suboptimal alignment. To address t…

Cited by 0SourceScholar
2025

Beyond the Seen: Bounded Distribution Estimation for Open-Vocabulary Learning

NeurIPS 2025poster

Open-vocabulary learning requires modeling the data distribution in open environments, which consists of both seen-class and unseen-class data. Existing methods estimate the distribution in open environments using seen-class data, where the absence of unseen classes makes the estimation error inhe…

Cited by 0SourceScholar
2025

Consistency of Compositional Generalization Across Multiple Levels

AAAI 2025technical

Compositional generalization is the capability of a model to understand novel compositions composed of seen concepts. There are multiple levels of novel compositions including phrase-phrase level, phrase-word level, and word-word level. Existing methods achieve promising compositional generalization…

2022

Efficient Riemannian Meta-Optimization by Implicit Differentiation

AAAI 2022technical

To solve optimization problems with nonlinear constrains, the recently developed Riemannian meta-optimization methods show promise, which train neural networks as an optimizer to perform optimization on Riemannian manifolds. A key challenge is the heavy computational and memory burdens, because com…

2021

Learning a Gradient-free Riemannian Optimizer on Tangent Spaces

AAAI 2021technical

A principal way of addressing constrained optimization problems is to model them as problems on Riemannian manifolds. Recently, Riemannian meta-optimization provides a promising way for solving constrained optimization problems by learning optimizers on Riemannian manifolds in a data-driven fashion,…