Cristian Petrescu-Prahova


2019

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SemEval-2019 Task 10: Math Question Answering
Mark Hopkins | Ronan Le Bras | Cristian Petrescu-Prahova | Gabriel Stanovsky | Hannaneh Hajishirzi | Rik Koncel-Kedziorski
Proceedings of the 13th International Workshop on Semantic Evaluation

We report on the SemEval 2019 task on math question answering. We provided a question set derived from Math SAT practice exams, including 2778 training questions and 1082 test questions. For a significant subset of these questions, we also provided SMT-LIB logical form annotations and an interpreter that could solve these logical forms. Systems were evaluated based on the percentage of correctly answered questions. The top system correctly answered 45% of the test questions, a considerable improvement over the 17% random guessing baseline.

2017

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Beyond Sentential Semantic Parsing: Tackling the Math SAT with a Cascade of Tree Transducers
Mark Hopkins | Cristian Petrescu-Prahova | Roie Levin | Ronan Le Bras | Alvaro Herrasti | Vidur Joshi
Proceedings of the 2017 Conference on Empirical Methods in Natural Language Processing

We present an approach for answering questions that span multiple sentences and exhibit sophisticated cross-sentence anaphoric phenomena, evaluating on a rich source of such questions – the math portion of the Scholastic Aptitude Test (SAT). By using a tree transducer cascade as its basic architecture, our system propagates uncertainty from multiple sources (e.g. coreference resolution or verb interpretation) until it can be confidently resolved. Experiments show the first-ever results 43% recall and 91% precision) on SAT algebra word problems. We also apply our system to the public Dolphin algebra question set, and improve the state-of-the-art F1-score from 73.9% to 77.0%.

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Interactive Visualization for Linguistic Structure
Aaron Sarnat | Vidur Joshi | Cristian Petrescu-Prahova | Alvaro Herrasti | Brandon Stilson | Mark Hopkins
Proceedings of the 2017 Conference on Empirical Methods in Natural Language Processing: System Demonstrations

We provide a visualization library and web interface for interactively exploring a parse tree or a forest of parses. The library is not tied to any particular linguistic representation, but provides a general-purpose API for the interactive exploration of hierarchical linguistic structure. To facilitate rapid understanding of a complex structure, the API offers several important features, including expand/collapse functionality, positional and color cues, explicit visual support for sequential structure, and dynamic highlighting to convey node-to-text correspondence.