Search Results for author: Alessandro Sordoni

Found 42 papers, 24 papers with code

Self-training with Few-shot Rationalization

no code implementations EMNLP 2021 Meghana Moorthy Bhat, Alessandro Sordoni, Subhabrata Mukherjee

While pre-trained language models have obtained state-of-the-art performance for several natural language understanding tasks, they are quite opaque in terms of their decision-making process.

Decision Making Natural Language Understanding

Unsupervised Dependency Graph Network

1 code implementation ACL 2022 Yikang Shen, Shawn Tan, Alessandro Sordoni, Peng Li, Jie zhou, Aaron Courville

We introduce a new model, the Unsupervised Dependency Graph Network (UDGN), that can induce dependency structures from raw corpora and the masked language modeling task.

Language Modelling Masked Language Modeling +2

Evaluating Distributional Distortion in Neural Language Modeling

no code implementations ICLR 2022 Benjamin LeBrun, Alessandro Sordoni, Timothy J. O'Donnell

To address this gap, we develop a controlled evaluation scheme which uses generative models trained on natural data as artificial languages from which we can exactly compute sequence probabilities.

Language Modelling

Better Language Model with Hypernym Class Prediction

1 code implementation ACL 2022 He Bai, Tong Wang, Alessandro Sordoni, Peng Shi

Class-based language models (LMs) have been long devised to address context sparsity in $n$-gram LMs.

Language Modelling

Combining Modular Skills in Multitask Learning

1 code implementation28 Feb 2022 Edoardo M. Ponti, Alessandro Sordoni, Yoshua Bengio, Siva Reddy

By jointly learning these and a task-skill allocation matrix, the network for each task is instantiated as the average of the parameters of active skills.

reinforcement-learning

Does Pre-training Induce Systematic Inference? How Masked Language Models Acquire Commonsense Knowledge

no code implementations16 Dec 2021 Ian Porada, Alessandro Sordoni, Jackie Chi Kit Cheung

Transformer models pre-trained with a masked-language-modeling objective (e. g., BERT) encode commonsense knowledge as evidenced by behavioral probes; however, the extent to which this knowledge is acquired by systematic inference over the semantics of the pre-training corpora is an open question.

Language Modelling Masked Language Modeling

Learning to Dequantise with Truncated Flows

no code implementations ICLR 2022 Shawn Tan, Chin-wei Huang, Alessandro Sordoni, Aaron Courville

Addtionally, since the support of the marginal $q(z)$ is bounded and the support of prior $p(z)$ is not, we propose renormalising the prior distribution over the support of $q(z)$.

Variational Inference

Learnability and Expressiveness in Self-Supervised Learning

no code implementations29 Sep 2021 Yuchen Lu, Zhen Liu, Alessandro Sordoni, Aristide Baratin, Romain Laroche, Aaron Courville

In this work, we argue that representations induced by self-supervised learning (SSL) methods should both be expressive and learnable.

Data Augmentation Self-Supervised Learning

Self-training with Few-shot Rationalization: Teacher Explanations Aid Student in Few-shot NLU

no code implementations17 Sep 2021 Meghana Moorthy Bhat, Alessandro Sordoni, Subhabrata Mukherjee

While pre-trained language models have obtained state-of-the-art performance for several natural language understanding tasks, they are quite opaque in terms of their decision-making process.

Decision Making Natural Language Understanding

The Emergence of the Shape Bias Results from Communicative Efficiency

1 code implementation CoNLL (EMNLP) 2021 Eva Portelance, Michael C. Frank, Dan Jurafsky, Alessandro Sordoni, Romain Laroche

By the age of two, children tend to assume that new word categories are based on objects' shape, rather than their color or texture; this assumption is called the shape bias.

Decomposed Mutual Information Estimation for Contrastive Representation Learning

no code implementations25 Jun 2021 Alessandro Sordoni, Nouha Dziri, Hannes Schulz, Geoff Gordon, Phil Bachman, Remi Tachet

We propose decomposing the full MI estimation problem into a sum of smaller estimation problems by splitting one of the views into progressively more informed subviews and by applying the chain rule on MI between the decomposed views.

Data Augmentation Dialogue Generation +2

Understanding by Understanding Not: Modeling Negation in Language Models

1 code implementation NAACL 2021 Arian Hosseini, Siva Reddy, Dzmitry Bahdanau, R Devon Hjelm, Alessandro Sordoni, Aaron Courville

To improve language models in this regard, we propose to augment the language modeling objective with an unlikelihood objective that is based on negated generic sentences from a raw text corpus.

Language Modelling

Decomposing Mutual Information for Representation Learning

no code implementations1 Jan 2021 Alessandro Sordoni, Nouha Dziri, Hannes Schulz, Geoff Gordon, Remi Tachet des Combes, Philip Bachman

In this paper, we transform each view into a set of subviews and then decompose the original MI bound into a sum of bounds involving conditional MI between the subviews.

Dialogue Generation Representation Learning

Exploring and Predicting Transferability across NLP Tasks

1 code implementation EMNLP 2020 Tu Vu, Tong Wang, Tsendsuren Munkhdalai, Alessandro Sordoni, Adam Trischler, Andrew Mattarella-Micke, Subhransu Maji, Mohit Iyyer

We also develop task embeddings that can be used to predict the most transferable source tasks for a given target task, and we validate their effectiveness in experiments controlled for source and target data size.

Language Modelling Part-Of-Speech Tagging +3

Ordered Memory

1 code implementation NeurIPS 2019 Yikang Shen, Shawn Tan, Arian Hosseini, Zhouhan Lin, Alessandro Sordoni, Aaron Courville

Inspired by Ordered Neurons (Shen et al., 2018), we introduce a new attention-based mechanism and use its cumulative probability to control the writing and erasing operation of the memory.

Metalearned Neural Memory

1 code implementation NeurIPS 2019 Tsendsuren Munkhdalai, Alessandro Sordoni, Tong Wang, Adam Trischler

We augment recurrent neural networks with an external memory mechanism that builds upon recent progress in metalearning.

Question Answering reinforcement-learning

An Empirical Study of Example Forgetting during Deep Neural Network Learning

2 code implementations ICLR 2019 Mariya Toneva, Alessandro Sordoni, Remi Tachet des Combes, Adam Trischler, Yoshua Bengio, Geoffrey J. Gordon

Inspired by the phenomenon of catastrophic forgetting, we investigate the learning dynamics of neural networks as they train on single classification tasks.

General Classification

Towards Text Generation with Adversarially Learned Neural Outlines

no code implementations NeurIPS 2018 Sandeep Subramanian, Sai Rajeswar Mudumba, Alessandro Sordoni, Adam Trischler, Aaron C. Courville, Chris Pal

We generate outlines with an adversarial model trained to approximate the distribution of sentences in a latent space induced by general-purpose sentence encoders.

Text Generation

Counting to Explore and Generalize in Text-based Games

2 code implementations29 Jun 2018 Xingdi Yuan, Marc-Alexandre Côté, Alessandro Sordoni, Romain Laroche, Remi Tachet des Combes, Matthew Hausknecht, Adam Trischler

We propose a recurrent RL agent with an episodic exploration mechanism that helps discovering good policies in text-based game environments.

text-based games

Augmented CycleGAN: Learning Many-to-Many Mappings from Unpaired Data

3 code implementations ICML 2018 Amjad Almahairi, Sai Rajeswar, Alessandro Sordoni, Philip Bachman, Aaron Courville

Learning inter-domain mappings from unpaired data can improve performance in structured prediction tasks, such as image segmentation, by reducing the need for paired data.

Semantic Segmentation Structured Prediction

Towards Information-Seeking Agents

no code implementations8 Dec 2016 Philip Bachman, Alessandro Sordoni, Adam Trischler

We develop a general problem setting for training and testing the ability of agents to gather information efficiently.

reinforcement-learning

Iterative Alternating Neural Attention for Machine Reading

1 code implementation7 Jun 2016 Alessandro Sordoni, Philip Bachman, Adam Trischler, Yoshua Bengio

We propose a novel neural attention architecture to tackle machine comprehension tasks, such as answering Cloze-style queries with respect to a document.

Ranked #4 on Question Answering on Children's Book Test (Accuracy-NE metric)

Question Answering Reading Comprehension

A Hierarchical Latent Variable Encoder-Decoder Model for Generating Dialogues

9 code implementations19 May 2016 Iulian Vlad Serban, Alessandro Sordoni, Ryan Lowe, Laurent Charlin, Joelle Pineau, Aaron Courville, Yoshua Bengio

Sequential data often possesses a hierarchical structure with complex dependencies between subsequences, such as found between the utterances in a dialogue.

Response Generation

Building End-To-End Dialogue Systems Using Generative Hierarchical Neural Network Models

7 code implementations17 Jul 2015 Iulian V. Serban, Alessandro Sordoni, Yoshua Bengio, Aaron Courville, Joelle Pineau

We investigate the task of building open domain, conversational dialogue systems based on large dialogue corpora using generative models.

Word Embeddings

A Hierarchical Recurrent Encoder-Decoder For Generative Context-Aware Query Suggestion

3 code implementations8 Jul 2015 Alessandro Sordoni, Yoshua Bengio, Hossein Vahabi, Christina Lioma, Jakob G. Simonsen, Jian-Yun Nie

Our novel hierarchical recurrent encoder-decoder architecture allows the model to be sensitive to the order of queries in the context while avoiding data sparsity.

deltaBLEU: A Discriminative Metric for Generation Tasks with Intrinsically Diverse Targets

no code implementations IJCNLP 2015 Michel Galley, Chris Brockett, Alessandro Sordoni, Yangfeng Ji, Michael Auli, Chris Quirk, Margaret Mitchell, Jianfeng Gao, Bill Dolan

We introduce Discriminative BLEU (deltaBLEU), a novel metric for intrinsic evaluation of generated text in tasks that admit a diverse range of possible outputs.

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