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Letitia Parcalabescu

6 accepted papers

2025

Do Vision & Language Decoders use Images and Text equally? How Self-consistent are their Explanations?

ICLR 2025poster

Vision and language model (VLM) decoders are currently the best-performing architectures on multimodal tasks. Next to answers, they are able to produce natural language explanations, either in post-hoc or CoT settings. However, it is not clear to what extent they are using the input vision and text…

2024

On Measuring Faithfulness or Self-consistency of Natural Language Explanations

ACL 2024long

Large language models (LLMs) can explain their predictions through post-hoc or Chain-of-Thought (CoT) explanations. But an LLM could make up reasonably sounding explanations that are unfaithful to its underlying reasoning. Recent work has designed tests that aim to judge the faithfulness of post-hoc…

2024

ViLMA: A Zero-Shot Benchmark for Linguistic and Temporal Grounding in Video-Language Models

ICLR 2024poster

With the ever-increasing popularity of pretrained Video-Language Models (VidLMs), there is a pressing need to develop robust evaluation methodologies that delve deeper into their visio-linguistic capabilities. To address this challenge, we present ViLMA (Video Language Model Assessment), a task-agno…

Cited by 13SourcePDFScholar
2023

MM-SHAP: A Performance-agnostic Metric for Measuring Multimodal Contributions in Vision and Language Models & Tasks

ACL 2023long

Vision and language models (VL) are known to exploit unrobust indicators in individual modalities (e.g., introduced by distributional biases) instead of focusing on relevant information in each modality. That a unimodal model achieves similar accuracy on a VL task to a multimodal one, indicates that…

2022

MAGMA – Multimodal Augmentation of Generative Models through Adapter-based Finetuning

EMNLP 2022finding

Large-scale pretraining is fast becoming the norm in Vision-Language (VL) modeling. However, prevailing VL approaches are limited by the requirement for labeled data and the use of complex multi-step pretraining objectives. We present MAGMA - a simple method for augmenting generative language models…

2022

VALSE: A Task-Independent Benchmark for Vision and Language Models Centered on Linguistic Phenomena

ACL 2022long

We propose VALSE (Vision And Language Structured Evaluation), a novel benchmark designed for testing general-purpose pretrained vision and language (V&L) models for their visio-linguistic grounding capabilities on specific linguistic phenomena. VALSE offers a suite of six tests covering various ling…