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Bruno Martins

10 accepted papers

2025

A Conformal Risk Control Framework for Granular Word Assessment and Uncertainty Calibration of CLIPScore Quality Estimates

ACL 2025finding

This study explores current limitations of learned image captioning evaluation metrics, specifically the lack of granular assessments for errors within captions, and the reliance on single-point quality estimates without considering uncertainty. To address the limitations, we propose a simple yet ef…

2025

Evaluation of Multilingual Image Captioning: How far can we get with CLIP models?

NAACL 2025findings

The evaluation of image captions, looking at both linguistic fluency and semantic correspondence to visual contents, has witnessed a significant effort. Still, despite advancements such as the CLIPScore metric, multilingual captioning evaluation has remained relatively unexplored. This work presents…

2025

From Tower to Spire: Adding the Speech Modality to a Translation-Specialist LLM

EMNLP 2025

We introduce Spire, a speech-augmented language model (LM) capable of both translating and transcribing speech input from English into 10 other languages as well as translating text input in both language directions. Spire integrates the speech modality into an existing multilingual LM via speech di

2025

Large Language Model-Based Robot Task Planning from Voice Command Transcriptions

IROS 2025

One of the primary challenges in building a General Purpose Service Robot (GPSR), i.e. a robot capable of executing generic human commands, lies in acting upon natural language instructions. These instructions often contain speech recognition errors and incomplete information, complicating the extra

Cited by 0SourcecodeScholar
2024

Dwell in the Beginning: How Language Models Embed Long Documents for Dense Retrieval

ACL 2024short

This study investigates the existence of positional biases in Transformer-based language models for text representation learning, particularly in the context of web document retrieval. We build on previous research that demonstrated loss of information in the middle of input sequences for causal lan…

2024

PAELLA: Parameter-Efficient Lightweight Language-Agnostic Captioning Model

NAACL 2024findings

We introduce PAELLA, a Parameter-Efficient Lightweight Language-Agnostic image captioning model designed to be both parameter and data-efficient using retrieval augmentation. The model is trained by learning a small mapping network with 34M parameters between a pre-trained visual model and a multili…

2023

LMCap: Few-shot Multilingual Image Captioning by Retrieval Augmented Language Model Prompting

ACL 2023findings

Multilingual image captioning has recently been tackled by training with large-scale machine translated data, which is an expensive, noisy, and time-consuming process. Without requiring any multilingual caption data, we propose LMCap, an image-blind few-shot multilingual captioning model that works…

2023

SmallCap: Lightweight Image Captioning Prompted With Retrieval Augmentation

CVPR 2023poster

Recent advances in image captioning have focused on scaling the data and model size, substantially increasing the cost of pre-training and finetuning. As an alternative to large models, we present SmallCap, which generates a caption conditioned on an input image and related captions retrieved from a…