Ariadna Quattoni


2020

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A comparison between CNNs and WFAs for Sequence Classification
Ariadna Quattoni | Xavier Carreras
Proceedings of SustaiNLP: Workshop on Simple and Efficient Natural Language Processing

We compare a classical CNN architecture for sequence classification involving several convolutional and max-pooling layers against a simple model based on weighted finite state automata (WFA). Each model has its advantages and disadvantages and it is possible that they could be combined. However, we believe that the first research goal should be to investigate and understand how do these two apparently dissimilar models compare in the context of specific natural language processing tasks. This paper is the first step towards that goal. Our experiments with five sequence classification datasets suggest that, despite the apparent simplicity of WFA models and training algorithms, the performance of WFAs is comparable to that of the CNNs.

2019

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Interpolated Spectral NGram Language Models
Ariadna Quattoni | Xavier Carreras
Proceedings of the 57th Annual Meeting of the Association for Computational Linguistics

Spectral models for learning weighted non-deterministic automata have nice theoretical and algorithmic properties. Despite this, it has been challenging to obtain competitive results in language modeling tasks, for two main reasons. First, in order to capture long-range dependencies of the data, the method must use statistics from long substrings, which results in very large matrices that are difficult to decompose. The second is that the loss function behind spectral learning, based on moment matching, differs from the probabilistic metrics used to evaluate language models. In this work we employ a technique for scaling up spectral learning, and use interpolated predictions that are optimized to maximize perplexity. Our experiments in character-based language modeling show that our method matches the performance of state-of-the-art ngram models, while being very fast to train.

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Proceedings of the Workshop on Deep Learning and Formal Languages: Building Bridges
Jason Eisner | Matthias Gallé | Jeffrey Heinz | Ariadna Quattoni | Guillaume Rabusseau
Proceedings of the Workshop on Deep Learning and Formal Languages: Building Bridges

2017

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InToEventS: An Interactive Toolkit for Discovering and Building Event Schemas
Germán Ferrero | Audi Primadhanty | Ariadna Quattoni
Proceedings of the Software Demonstrations of the 15th Conference of the European Chapter of the Association for Computational Linguistics

Event Schema Induction is the task of learning a representation of events (e.g., bombing) and the roles involved in them (e.g, victim and perpetrator). This paper presents InToEventS, an interactive tool for learning these schemas. InToEventS allows users to explore a corpus and discover which kind of events are present. We show how users can create useful event schemas using two interactive clustering steps.

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Prepositional Phrase Attachment over Word Embedding Products
Pranava Swaroop Madhyastha | Xavier Carreras | Ariadna Quattoni
Proceedings of the 15th International Conference on Parsing Technologies

We present a low-rank multi-linear model for the task of solving prepositional phrase attachment ambiguity (PP task). Our model exploits tensor products of word embeddings, capturing all possible conjunctions of latent embeddings. Our results on a wide range of datasets and task settings show that tensor products are the best compositional operation and that a relatively simple multi-linear model that uses only word embeddings of lexical features can outperform more complex non-linear architectures that exploit the same information. Our proposed model gives the current best reported performance on an out-of-domain evaluation and performs competively on out-of-domain dependency parsing datasets.

2016

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Structured Prediction with Output Embeddings for Semantic Image Annotation
Ariadna Quattoni | Arnau Ramisa | Pranava Swaroop Madhyastha | Edgar Simo-Serra | Francesc Moreno-Noguer
Proceedings of the 2016 Conference of the North American Chapter of the Association for Computational Linguistics: Human Language Technologies

2015

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Semantic Tuples for Evaluation of Image to Sentence Generation
Lily D. Ellebracht | Arnau Ramisa | Pranava Swaroop Madhyastha | Jose Cordero-Rama | Francesc Moreno-Noguer | Ariadna Quattoni
Proceedings of the Fourth Workshop on Vision and Language

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Low-Rank Regularization for Sparse Conjunctive Feature Spaces: An Application to Named Entity Classification
Audi Primadhanty | Xavier Carreras | Ariadna Quattoni
Proceedings of the 53rd Annual Meeting of the Association for Computational Linguistics and the 7th International Joint Conference on Natural Language Processing (Volume 1: Long Papers)

2014

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Learning Task-specific Bilexical Embeddings
Pranava Swaroop Madhyastha | Xavier Carreras | Ariadna Quattoni
Proceedings of COLING 2014, the 25th International Conference on Computational Linguistics: Technical Papers

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Spectral Learning Techniques for Weighted Automata, Transducers, and Grammars
Borja Balle | Ariadna Quattoni | Xavier Carreras
Proceedings of the 2014 Conference on Empirical Methods in Natural Language Processing: Tutorial Abstracts

In recent years we have seen the development of efficient and provably correct algorithms for learning weighted automata and closely related function classes such as weighted transducers and weighted context-free grammars. The common denominator of all these algorithms is the so-called spectral method, which gives an efficient and robust way to estimate recursively defined functions from empirical estimations of observable statistics. These algorithms are appealing because of the existence of theoretical guarantees (e.g. they are not susceptible to local minima) and because of their efficiency. However, despite their simplicity and wide applicability to real problems, their impact in NLP applications is still moderate. One of the goals of this tutorial is to remedy this situation.The contents that will be presented in this tutorial will offer a complementary perspective with respect to previous tutorials on spectral methods presented at ICML-2012, ICML-2013 and NAACL-2013. Rather than using the language of graphical models and signal processing, we tell the story from the perspective of formal languages and automata theory (without assuming a background in formal algebraic methods). Our presentation highlights the common intuitions lying behind different spectral algorithms by presenting them in a unified framework based on the concepts of low-rank factorizations and completions of Hankel matrices. In addition, we provide an interpretation of the method in terms of forward and backward recursions for automata and grammars. This provides extra intuitions about the method and stresses the importance of matrix factorization for learning automata and grammars. We believe that this complementary perspective might be appealing for an NLP audience and serve to put spectral learning in a wider and, perhaps for some, more familiar context. Our hope is that this will broaden the understanding of these methods by the NLP community and empower many researchers to apply these techniques to novel problems.The content of the tutorial will be divided into four blocks of 45 minutes each, as follows. The first block will introduce the basic definitions of weighted automata and Hankel matrices, and present a key connection between the fundamental theorem of weighted automata and learning. In the second block we will discuss the case of probabilistic automata in detail, touching upon all aspects from the underlying theory to the tricks required to achieve accurate and scalable learning algorithms. The third block will present extensions to related models, including sequence tagging models, finite-state transducers and weighted context-free grammars. The last block will describe a general framework for using spectral techniques in more general situations where a matrix completion pre-processing step is required; several applications of this approach will be described.

2013

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Unsupervised Spectral Learning of WCFG as Low-rank Matrix Completion
Raphaël Bailly | Xavier Carreras | Franco M. Luque | Ariadna Quattoni
Proceedings of the 2013 Conference on Empirical Methods in Natural Language Processing

2012

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Spectral Learning for Non-Deterministic Dependency Parsing
Franco M. Luque | Ariadna Quattoni | Borja Balle | Xavier Carreras
Proceedings of the 13th Conference of the European Chapter of the Association for Computational Linguistics