Search Results for author: Nicolas Chapados

Found 17 papers, 9 papers with code

LLM2Vec: Large Language Models Are Secretly Powerful Text Encoders

2 code implementations9 Apr 2024 Parishad BehnamGhader, Vaibhav Adlakha, Marius Mosbach, Dzmitry Bahdanau, Nicolas Chapados, Siva Reddy

We outperform encoder-only models by a large margin on word-level tasks and reach a new unsupervised state-of-the-art performance on the Massive Text Embeddings Benchmark (MTEB).

Contrastive Learning

Meta-learning framework with applications to zero-shot time-series forecasting

3 code implementations7 Feb 2020 Boris N. Oreshkin, Dmitri Carpov, Nicolas Chapados, Yoshua Bengio

Can meta-learning discover generic ways of processing time series (TS) from a diverse dataset so as to greatly improve generalization on new TS coming from different datasets?

Meta-Learning Time Series +1

TACTiS: Transformer-Attentional Copulas for Time Series

1 code implementation7 Feb 2022 Alexandre Drouin, Étienne Marcotte, Nicolas Chapados

The estimation of time-varying quantities is a fundamental component of decision making in fields such as healthcare and finance.

Decision Making Time Series +1

TACTiS-2: Better, Faster, Simpler Attentional Copulas for Multivariate Time Series

1 code implementation2 Oct 2023 Arjun Ashok, Étienne Marcotte, Valentina Zantedeschi, Nicolas Chapados, Alexandre Drouin

We introduce a new model for multivariate probabilistic time series prediction, designed to flexibly address a range of tasks including forecasting, interpolation, and their combinations.

Time Series Time Series Prediction

HeMIS: Hetero-Modal Image Segmentation

1 code implementation18 Jul 2016 Mohammad Havaei, Nicolas Guizard, Nicolas Chapados, Yoshua Bengio

We introduce a deep learning image segmentation framework that is extremely robust to missing imaging modalities.

Image Segmentation Imputation +2

Regions of Reliability in the Evaluation of Multivariate Probabilistic Forecasts

1 code implementation19 Apr 2023 Étienne Marcotte, Valentina Zantedeschi, Alexandre Drouin, Nicolas Chapados

Multivariate probabilistic time series forecasts are commonly evaluated via proper scoring rules, i. e., functions that are minimal in expectation for the ground-truth distribution.

Time Series Time Series Forecasting

Effective Bayesian Modeling of Groups of Related Count Time Series

no code implementations15 May 2014 Nicolas Chapados

Time series of counts arise in a variety of forecasting applications, for which traditional models are generally inappropriate.

Time Series Time Series Analysis

Adversarially Learned Mixture Model

no code implementations14 Jul 2018 Andrew Jesson, Cécile Low-Kam, Tanya Nair, Florian Soudan, Florent Chandelier, Nicolas Chapados

The Adversarially Learned Mixture Model (AMM) is a generative model for unsupervised or semi-supervised data clustering.

Clustering

CASED: Curriculum Adaptive Sampling for Extreme Data Imbalance

no code implementations27 Jul 2018 Andrew Jesson, Nicolas Guizard, Sina Hamidi Ghalehjegh, Damien Goblot, Florian Soudan, Nicolas Chapados

We introduce CASED, a novel curriculum sampling algorithm that facilitates the optimization of deep learning segmentation or detection models on data sets with extreme class imbalance.

Lung Nodule Detection Segmentation

Learning to Learn with Conditional Class Dependencies

no code implementations ICLR 2019 Xiang Jiang, Mohammad Havaei, Farshid Varno, Gabriel Chartrand, Nicolas Chapados, Stan Matwin

Neural networks can learn to extract statistical properties from data, but they seldom make use of structured information from the label space to help representation learning.

Few-Shot Learning Representation Learning

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