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André Martins

8 accepted papers

2023

CREST: A Joint Framework for Rationalization and Counterfactual Text Generation

ACL 2023long

Selective rationales and counterfactual examples have emerged as two effective, complementary classes of interpretability methods for analyzing and training NLP models. However, prior work has not explored how these methods can be integrated to combine their complementary advantages. We overcome thi…

2023

Glot500: Scaling Multilingual Corpora and Language Models to 500 Languages

ACL 2023long

The NLP community has mainly focused on scaling Large Language Models (LLMs) vertically, i.e., making them better for about 100 languages. We instead scale LLMs horizontally: we create, through continued pretraining, Glot500-m, an LLM that covers 511 predominantly low-resource languages. An importan…

2023

Optimal Transport for Unsupervised Hallucination Detection in Neural Machine Translation

ACL 2023long

Neural machine translation (NMT) has become the de-facto standard in real-world machine translation applications. However, NMT models can unpredictably produce severely pathological translations, known as hallucinations, that seriously undermine user trust. It becomes thus crucial to implement effec…

2023

Python Code Generation by Asking Clarification Questions

ACL 2023long

Code generation from text requires understanding the user’s intent from a natural languagedescription and generating an executable code snippet that satisfies this intent. While recent pretrained language models demonstrate remarkable performance for this task, these models fail when the given natur…

2023

The Inside Story: Towards Better Understanding of Machine Translation Neural Evaluation Metrics

ACL 2023short

Neural metrics for machine translation evaluation, such as COMET, exhibit significant improvements in their correlation with human judgments, as compared to traditional metrics based on lexical overlap, such as BLEU. Yet, neural metrics are, to a great extent, “black boxes” returning a single senten…

2023

When Does Translation Require Context? A Data-driven, Multilingual Exploration

ACL 2023long

Although proper handling of discourse significantly contributes to the quality of machine translation (MT), these improvements are not adequately measured in common translation quality metrics. Recent works in context-aware MT attempt to target a small set of discourse phenomena during evaluation, h…

2020

Efficient Marginalization of Discrete and Structured Latent Variables via Sparsity

NeurIPS 2020spotlight

Training neural network models with discrete (categorical or structured) latent variables can be computationally challenging, due to the need for marginalization over large or combinatorial sets. To circumvent this issue, one typically resorts to sampling-based approximations of the true marginal, r…

2020

Sparse and Continuous Attention Mechanisms

NeurIPS 2020spotlight

Exponential families are widely used in machine learning; they include many distributions in continuous and discrete domains (e.g., Gaussian, Dirichlet, Poisson, and categorical distributions via the softmax transformation). Distributions in each of these families have fixed support. In contrast, fo…