arXiv AI

Representation Alignment from a Few Paired Data via Distilled Optimal Transport

The paper introduces a method for aligning two independently pretrained unimodal encoders using only a small set of paired examples (≈100–500) while leveraging abundant unpaired data. It represents each modality by similarities to the paired anchors, matches the resulting point clouds via a single entropic optimal transport problem that mitigates hubness, and distills the transport plan into lightweight encoders for inductive correspondence. Experiments on image‑text and molecule‑text datasets (Flickr30k, MS‑COCO, ChEBI‑20) show that this approach outperforms existing methods under the same anchor budget.

arXiv AI
Jun 24

Mind the Heads: Topological Representation Alignment for Multimodal LLMs

arXiv:2606. 23885v1 Announce Type: cross Abstract: Representation alignment has emerged as an effective approach to improve Multimodal Large Language Models (MLLMs) by regularizing their internal representations toward those of an external vision encoder.

By Davide Caffagni, Alberto Compagnoni, Federico Melis, Sara Sarto, Pier Luigi Dovesi, Mark Granroth-Wilding, Marcella Cornia, Lorenzo Baraldi
arXiv Machine Learning
Aug 11

Embedding Initialization for Unseen Low-resource Languages in Multilingual NMT: A Case Study on Limbum-English Translation

arXiv:2608. 07629v1 Announce Type: cross Abstract: Multilingual neural machine translation models such as NLLB-200 cover 200 languages but leave thousands unsupported, including most Grassfields Bantu languages of Cameroon.

By Samiratu Ntohsi, Neza David Tuyishimire, Anesu Kafesu, Marvin Ogore, Samuel Oluwajunwonlo Babalola, Oche Ankeli
arXiv Computation and Language
Sep 28

Why Better Cross-Lingual Alignment Fails for Better Cross-Lingual Transfer: Case of Encoders

The paper challenges the assumption that improving cross‑lingual alignment automatically enhances cross‑lingual transfer. Using XLM‑R models aligned on token, sentence, and masked‑language‑modeling objectives across four language pairs, the authors evaluate zero‑shot transfer on part‑of‑speech tagging and sentence classification. They find that embedding‑based alignment metrics poorly predict downstream performance and that alignment and task gradients are often nearly orthogonal, especially when operating at different representational levels.

By Yana Veitsman, Yihong Liu, Hinrich Sch\"utze