Yashar Mehdad

According to our database, Yashar Mehdad authored at least 82 papers between 2009 and 2024.

Collaborative distances:

• Dijkstra number of four.
• Erdős number of four.

2024

Effective Long-Context Scaling of Foundation Models.

Wenhan Xiong, Jingyu Liu, Igor Molybog, Hejia Zhang, Prajjwal Bhargava, Rui Hou, Louis Martin, Rashi Rungta, Karthik Abinav Sankararaman, Barlas Oguz, Madian Khabsa, Han Fang, Yashar Mehdad, Sharan Narang, Kshitiz Malik, Angela Fan, Shruti Bhosale, Sergey Edunov, Mike Lewis, Sinong Wang, Hao Ma

Proceedings of the 2024 Conference of the North American Chapter of the Association for Computational Linguistics: Human Language Technologies (Volume 1: Long Papers), 2024

Attention or Convolution: Transformer Encoders in Audio Language Models for Inference Efficiency.

Sungho Jeon, Ching-Feng Yeh, Hakan Inan, Wei-Ning Hsu, Rashi Rungta, Yashar Mehdad, Daniel Bikel

Proceedings of the IEEE International Conference on Acoustics, 2024

LLM-QAT: Data-Free Quantization Aware Training for Large Language Models.

Zechun Liu, Barlas Oguz, Changsheng Zhao, Ernie Chang, Pierre Stock, Yashar Mehdad, Yangyang Shi, Raghuraman Krishnamoorthi, Vikas Chandra

Proceedings of the Findings of the Association for Computational Linguistics, 2024

2023

VideoOFA: Two-Stage Pre-Training for Video-to-Text Generation.

Xilun Chen, Lili Yu, Wenhan Xiong, Barlas Oguz, Yashar Mehdad, Wen-tau Yih

CoRR, 2023

Adapting Pretrained Text-to-Text Models for Long Text Sequences.

Wenhan Xiong, Anchit Gupta, Shubham Toshniwal, Yashar Mehdad, Scott Yih

Proceedings of the Findings of the Association for Computational Linguistics: EMNLP 2023, 2023

How to Train Your Dragon: Diverse Augmentation Towards Generalizable Dense Retrieval.

Sheng-Chieh Lin, Akari Asai, Minghan Li, Barlas Oguz, Jimmy Lin, Yashar Mehdad, Wen-tau Yih, Xilun Chen

Proceedings of the Findings of the Association for Computational Linguistics: EMNLP 2023, 2023

Hierarchical Video-Moment Retrieval and Step-Captioning.

Abhay Zala, Jaemin Cho, Satwik Kottur, Xilun Chen, Barlas Oguz, Yashar Mehdad, Mohit Bansal

Proceedings of the IEEE/CVF Conference on Computer Vision and Pattern Recognition, 2023

CITADEL: Conditional Token Interaction via Dynamic Lexical Routing for Efficient and Effective Multi-Vector Retrieval.

Minghan Li, Sheng-Chieh Lin, Barlas Oguz, Asish Ghoshal, Jimmy Lin, Yashar Mehdad, Wen-tau Yih, Xilun Chen

Proceedings of the 61st Annual Meeting of the Association for Computational Linguistics (Volume 1: Long Papers), 2023

2022

Improving Faithfulness of Abstractive Summarization by Controlling Confounding Effect of Irrelevant Sentences.

Asish Ghoshal, Arash Einolghozati, Ankit Arun, Haoran Li, Lili Yu, Yashar Mehdad, Scott Wen-tau Yih, Asli Celikyilmaz

CoRR, 2022

Structured Summarization: Unified Text Segmentation and Segment Labeling as a Generation Task.

Hakan Inan, Rashi Rungta, Yashar Mehdad

CoRR, 2022

QUASER: Question Answering with Scalable Extractive Rationalization.

Asish Ghoshal, Srinivasan Iyer, Bhargavi Paranjape, Kushal Lakhotia, Scott Wen-tau Yih, Yashar Mehdad

Proceedings of the SIGIR '22: The 45th International ACM SIGIR Conference on Research and Development in Information Retrieval, Madrid, Spain, July 11, 2022

BiT: Robustly Binarized Multi-distilled Transformer.

Zechun Liu, Barlas Oguz, Aasish Pappu, Lin Xiao, Scott Yih, Meng Li, Raghuraman Krishnamoorthi, Yashar Mehdad

Proceedings of the Advances in Neural Information Processing Systems 35: Annual Conference on Neural Information Processing Systems 2022, 2022

Simple Local Attentions Remain Competitive for Long-Context Tasks.

Wenhan Xiong, Barlas Oguz, Anchit Gupta, Xilun Chen, Diana Liskovich, Omer Levy, Scott Yih, Yashar Mehdad

Proceedings of the 2022 Conference of the North American Chapter of the Association for Computational Linguistics: Human Language Technologies, 2022

CONFIT: Toward Faithful Dialogue Summarization with Linguistically-Informed Contrastive Fine-tuning.

Xiangru Tang, Arjun Nair, Borui Wang, Bingyao Wang, Jai Desai, Aaron Wade, Haoran Li, Asli Celikyilmaz, Yashar Mehdad, Dragomir R. Radev

Proceedings of the 2022 Conference of the North American Chapter of the Association for Computational Linguistics: Human Language Technologies, 2022

Investigating Crowdsourcing Protocols for Evaluating the Factual Consistency of Summaries.

Xiangru Tang, Alexander R. Fabbri, Haoran Li, Ziming Mao, Griffin Adams, Borui Wang, Asli Celikyilmaz, Yashar Mehdad, Dragomir R. Radev

Proceedings of the 2022 Conference of the North American Chapter of the Association for Computational Linguistics: Human Language Technologies, 2022

Domain-matched Pre-training Tasks for Dense Retrieval.

Barlas Oguz, Kushal Lakhotia, Anchit Gupta, Patrick S. H. Lewis, Vladimir Karpukhin, Aleksandra Piktus, Xilun Chen, Sebastian Riedel, Scott Yih, Sonal Gupta, Yashar Mehdad

Proceedings of the Findings of the Association for Computational Linguistics: NAACL 2022, 2022

UniK-QA: Unified Representations of Structured and Unstructured Knowledge for Open-Domain Question Answering.

Barlas Oguz, Xilun Chen, Vladimir Karpukhin, Stan Peshterliev, Dmytro Okhonko, Michael Sejr Schlichtkrull, Sonal Gupta, Yashar Mehdad, Scott Yih

Proceedings of the Findings of the Association for Computational Linguistics: NAACL 2022, 2022

STRUDEL: Structured Dialogue Summarization for Dialogue Comprehension.

Borui Wang, Chengcheng Feng, Arjun Nair, Madelyn Mao, Jai Desai, Asli Celikyilmaz, Haoran Li, Yashar Mehdad, Dragomir Radev

Proceedings of the 2022 Conference on Empirical Methods in Natural Language Processing, 2022

Bridging the Training-Inference Gap for Dense Phrase Retrieval.

Gyuwan Kim, Jinhyuk Lee, Barlas Oguz, Wenhan Xiong, Yizhe Zhang, Yashar Mehdad, William Yang Wang

Proceedings of the Findings of the Association for Computational Linguistics: EMNLP 2022, 2022

Salient Phrase Aware Dense Retrieval: Can a Dense Retriever Imitate a Sparse One?

Xilun Chen, Kushal Lakhotia, Barlas Oguz, Anchit Gupta, Patrick S. H. Lewis, Stan Peshterliev, Yashar Mehdad, Sonal Gupta, Wen-tau Yih

Proceedings of the Findings of the Association for Computational Linguistics: EMNLP 2022, 2022

2021

Investigating Crowdsourcing Protocols for Evaluating the Factual Consistency of Summaries.

Xiangru Tang, Alexander R. Fabbri, Ziming Mao, Griffin Adams, Borui Wang, Haoran Li, Yashar Mehdad, Dragomir R. Radev

CoRR, 2021

EASE: Extractive-Abstractive Summarization with Explanations.

Haoran Li, Arash Einolghozati, Srinivasan Iyer, Bhargavi Paranjape, Yashar Mehdad, Sonal Gupta, Marjan Ghazvininejad

CoRR, 2021

Towards Understanding the Optimal Behaviors of Deep Active Learning Algorithms.

Yilun Zhou, Adi Renduchintala, Xian Li, Sida Wang, Yashar Mehdad, Asish Ghoshal

CoRR, 2021

RECONSIDER: Improved Re-Ranking using Span-Focused Cross-Attention for Open Domain Question Answering.

Srinivasan Iyer, Sewon Min, Yashar Mehdad, Wen-tau Yih

Proceedings of the 2021 Conference of the North American Chapter of the Association for Computational Linguistics: Human Language Technologies, 2021

Improving Zero and Few-Shot Abstractive Summarization with Intermediate Fine-tuning and Data Augmentation.

Alexander R. Fabbri, Simeng Han, Haoyuan Li, Haoran Li, Marjan Ghazvininejad, Shafiq R. Joty, Dragomir R. Radev, Yashar Mehdad

Proceedings of the 2021 Conference of the North American Chapter of the Association for Computational Linguistics: Human Language Technologies, 2021

Answering Complex Open-Domain Questions with Multi-Hop Dense Retrieval.

Wenhan Xiong, Xiang Lorraine Li, Srini Iyer, Jingfei Du, Patrick S. H. Lewis, William Yang Wang, Yashar Mehdad, Scott Yih, Sebastian Riedel, Douwe Kiela, Barlas Oguz

Proceedings of the 9th International Conference on Learning Representations, 2021

Learning Better Structured Representations Using Low-rank Adaptive Label Smoothing.

Asish Ghoshal, Xilun Chen, Sonal Gupta, Luke Zettlemoyer, Yashar Mehdad

Proceedings of the 9th International Conference on Learning Representations, 2021

FiD-Ex: Improving Sequence-to-Sequence Models for Extractive Rationale Generation.

Kushal Lakhotia, Bhargavi Paranjape, Asish Ghoshal, Scott Yih, Yashar Mehdad, Srini Iyer

Proceedings of the 2021 Conference on Empirical Methods in Natural Language Processing, 2021

MTOP: A Comprehensive Multilingual Task-Oriented Semantic Parsing Benchmark.

Haoran Li, Abhinav Arora, Shuohui Chen, Anchit Gupta, Sonal Gupta, Yashar Mehdad

Proceedings of the 16th Conference of the European Chapter of the Association for Computational Linguistics: Main Volume, 2021

Towards Understanding the Behaviors of Optimal Deep Active Learning Algorithms.

Yilun Zhou, Adithya Renduchintala, Xian Li, Sida Wang, Yashar Mehdad, Asish Ghoshal

Proceedings of the 24th International Conference on Artificial Intelligence and Statistics, 2021

Do Explanations Help Users Detect Errors in Open-Domain QA? An Evaluation of Spoken vs. Visual Explanations.

Ana Valeria Gonzalez, Gagan Bansal, Angela Fan, Yashar Mehdad, Robin Jia, Srinivasan Iyer

Proceedings of the Findings of the Association for Computational Linguistics: ACL/IJCNLP 2021, 2021

ConvoSumm: Conversation Summarization Benchmark and Improved Abstractive Summarization with Argument Mining.

Alexander R. Fabbri, Faiaz Rahman, Imad Rizvi, Borui Wang, Haoran Li, Yashar Mehdad, Dragomir R. Radev

Proceedings of the 59th Annual Meeting of the Association for Computational Linguistics and the 11th International Joint Conference on Natural Language Processing, 2021

Syntax-augmented Multilingual BERT for Cross-lingual Transfer.

Wasi Uddin Ahmad, Haoran Li, Kai-Wei Chang, Yashar Mehdad

Proceedings of the 59th Annual Meeting of the Association for Computational Linguistics and the 11th International Joint Conference on Natural Language Processing, 2021

2020

Human Evaluation of Spoken vs. Visual Explanations for Open-Domain QA.

Ana Valeria Gonzalez, Gagan Bansal, Angela Fan, Robin Jia, Yashar Mehdad, Srinivasan Iyer

CoRR, 2020

Unified Open-Domain Question Answering with Structured and Unstructured Knowledge.

Barlas Oguz, Xilun Chen, Vladimir Karpukhin, Stan Peshterliev, Dmytro Okhonko, Michael Sejr Schlichtkrull, Sonal Gupta, Yashar Mehdad, Scott Yih

CoRR, 2020

RECONSIDER: Re-Ranking using Span-Focused Cross-Attention for Open Domain Question Answering.

Srinivasan Iyer, Sewon Min, Yashar Mehdad, Wen-tau Yih

CoRR, 2020

Conversational Semantic Parsing.

Armen Aghajanyan, Jean Maillard, Akshat Shrivastava, Keith Diedrick, Mike Haeger, Haoran Li, Yashar Mehdad, Ves Stoyanov, Anuj Kumar, Mike Lewis, Sonal Gupta

CoRR, 2020

NeurIPS 2020 EfficientQA Competition: Systems, Analyses and Lessons Learned.

Sewon Min, Jordan L. Boyd-Graber, Chris Alberti, Danqi Chen, Eunsol Choi, Michael Collins, Kelvin Guu, Hannaneh Hajishirzi, Kenton Lee, Jennimaria Palomaki, Colin Raffel, Adam Roberts, Tom Kwiatkowski, Patrick S. H. Lewis, Yuxiang Wu, Heinrich Küttler, Linqing Liu, Pasquale Minervini, Pontus Stenetorp, Sebastian Riedel, Sohee Yang, Minjoon Seo, Gautier Izacard, Fabio Petroni, Lucas Hosseini, Nicola De Cao, Edouard Grave, Ikuya Yamada, Sonse Shimaoka, Masatoshi Suzuki, Shumpei Miyawaki, Shun Sato, Ryo Takahashi, Jun Suzuki, Martin Fajcik, Martin Docekal, Karel Ondrej, Pavel Smrz, Hao Cheng, Yelong Shen, Xiaodong Liu, Pengcheng He, Weizhu Chen, Jianfeng Gao, Barlas Oguz, Xilun Chen, Vladimir Karpukhin, Stan Peshterliev, Dmytro Okhonko, Michael Sejr Schlichtkrull, Sonal Gupta, Yashar Mehdad, Wen-tau Yih

Proceedings of the NeurIPS 2020 Competition and Demonstration Track, 2020

Efficient One-Pass End-to-End Entity Linking for Questions.

Belinda Z. Li, Sewon Min, Srinivasan Iyer, Yashar Mehdad, Wen-tau Yih

Proceedings of the 2020 Conference on Empirical Methods in Natural Language Processing, 2020

Low-Resource Domain Adaptation for Compositional Task-Oriented Semantic Parsing.

Xilun Chen, Asish Ghoshal, Yashar Mehdad, Luke Zettlemoyer, Sonal Gupta

Proceedings of the 2020 Conference on Empirical Methods in Natural Language Processing, 2020

Conversational Semantic Parsing.

Armen Aghajanyan, Jean Maillard, Akshat Shrivastava, Keith Diedrick, Michael Haeger, Haoran Li, Yashar Mehdad, Veselin Stoyanov, Anuj Kumar, Mike Lewis, Sonal Gupta

Proceedings of the 2020 Conference on Empirical Methods in Natural Language Processing, 2020

2017

Rank-to-engage: New Listwise Approaches to Maximize Engagement.

Swayambhoo Jain, Akshay Soni, Nikolay Laptev, Yashar Mehdad

CoRR, 2017

Lightweight Multilingual Entity Extraction and Linking.

Aasish Pappu, Roi Blanco, Yashar Mehdad, Amanda Stent, Kapil Thadani

Proceedings of the Tenth ACM International Conference on Web Search and Data Mining, 2017

DocTag2Vec: An Embedding Based Multi-label Learning Approach for Document Tagging.

Sheng Chen, Akshay Soni, Aasish Pappu, Yashar Mehdad

Proceedings of the 2nd Workshop on Representation Learning for NLP, 2017

RIPML: A Restricted Isometry Property-Based Approach to Multilabel Learning.

Akshay Soni, Yashar Mehdad

Proceedings of the Thirtieth International Florida Artificial Intelligence Research Society Conference, 2017

Online Article Ranking as a Constrained, Dynamic, Multi-Objective Optimization Problem.

Jeya Balaji Balasubramanian, Akshay Soni, Yashar Mehdad, Nikolay Laptev

Proceedings of the Thirtieth International Florida Artificial Intelligence Research Society Conference, 2017

2016

Domain Adaptation for Named Entity Recognition in Online Media with Word Embeddings.

Vivek Kulkarni, Yashar Mehdad, Troy Chevalier

CoRR, 2016

Abusive Language Detection in Online User Content.

Chikashi Nobata, Joel R. Tetreault, Achint Thomas, Yashar Mehdad, Yi Chang

Proceedings of the 25th International Conference on World Wide Web, 2016

Do Characters Abuse More Than Words?

Yashar Mehdad, Joel R. Tetreault

Proceedings of the SIGDIAL 2016 Conference, 2016

A Low-Rank Approximation Approach to Learning Joint Embeddings of News Stories and Images for Timeline Summarization.

William Yang Wang, Yashar Mehdad, Dragomir R. Radev, Amanda Stent

Proceedings of the NAACL HLT 2016, 2016

Extractive Summarization under Strict Length Constraints.

Yashar Mehdad, Amanda Stent, Kapil Thadani, Dragomir R. Radev, Youssef Billawala, Karolina Buchner

Proceedings of the Tenth International Conference on Language Resources and Evaluation LREC 2016, 2016

2014

A Template-based Abstractive Meeting Summarization: Leveraging Summary and Source Text Relationships.

Tatsuro Oya, Yashar Mehdad, Giuseppe Carenini, Raymond T. Ng

Proceedings of the INLG 2014, 2014

Abstractive Summarization of Product Reviews Using Discourse Structure.

Shima Gerani, Yashar Mehdad, Giuseppe Carenini, Raymond T. Ng, Bita Nejat

Proceedings of the 2014 Conference on Empirical Methods in Natural Language Processing, 2014

Abstractive Summarization of Spoken and Written Conversations Based on Phrasal Queries.

Yashar Mehdad, Giuseppe Carenini, Raymond T. Ng

Proceedings of the 52nd Annual Meeting of the Association for Computational Linguistics, 2014

2013

Dialogue Act Recognition in Synchronous and Asynchronous Conversations.

Maryam Tavafi, Yashar Mehdad, Shafiq R. Joty, Giuseppe Carenini, Raymond T. Ng

Proceedings of the SIGDIAL 2013 Conference, 2013

Semeval-2013 Task 8: Cross-lingual Textual Entailment for Content Synchronization.

Matteo Negri, Alessandro Marchetti, Yashar Mehdad, Luisa Bentivogli, Danilo Giampiccolo

Proceedings of the 7th International Workshop on Semantic Evaluation, 2013

Towards Topic Labeling with Phrase Entailment and Aggregation.

Yashar Mehdad, Giuseppe Carenini, Raymond T. Ng, Shafiq R. Joty

Proceedings of the Human Language Technologies: Conference of the North American Chapter of the Association of Computational Linguistics, 2013

Abstractive Meeting Summarization with Entailment and Fusion.

Yashar Mehdad, Giuseppe Carenini, Frank Wm. Tompa, Raymond T. Ng

Proceedings of the ENLG 2013, 2013

Combining Intra- and Multi-sentential Rhetorical Parsing for Document-level Discourse Analysis.

Shafiq R. Joty, Giuseppe Carenini, Raymond T. Ng, Yashar Mehdad

Proceedings of the 51st Annual Meeting of the Association for Computational Linguistics, 2013

2012

Cross-Lingual Textual Entailment and Applications.

Yashar Mehdad

PhD thesis, 2012

Match without a Referee: Evaluating MT Adequacy without Reference Translations.

Yashar Mehdad, Matteo Negri, Marcello Federico

Proceedings of the Seventh Workshop on Statistical Machine Translation, 2012

CoSyne: synchronizing multilingual wiki content.

Amit Bronner, Matteo Negri, Yashar Mehdad, Angela Fahrni, Christof Monz

Proceedings of the Eighth Annual International Symposium on Wikis and Open Collaboration, 2012

FBK: Machine Translation Evaluation and Word Similarity metrics for Semantic Textual Similarity.

José Guilherme Camargo de Souza, Matteo Negri, Yashar Mehdad

Proceedings of the 6th International Workshop on Semantic Evaluation, 2012

Semeval-2012 Task 8: Cross-lingual Textual Entailment for Content Synchronization.

Matteo Negri, Alessandro Marchetti, Yashar Mehdad, Luisa Bentivogli, Danilo Giampiccolo

Proceedings of the 6th International Workshop on Semantic Evaluation, 2012

FBK: Cross-Lingual Textual Entailment Without Translation.

Yashar Mehdad, Matteo Negri, José Guilherme Camargo de Souza

Proceedings of the 6th International Workshop on Semantic Evaluation, 2012

Chinese Whispers: Cooperative Paraphrase Acquisition.

Matteo Negri, Yashar Mehdad, Alessandro Marchetti, Danilo Giampiccolo, Luisa Bentivogli

Proceedings of the Eighth International Conference on Language Resources and Evaluation, 2012

Detecting Semantic Equivalence and Information Disparity in Cross-lingual Documents.

Yashar Mehdad, Matteo Negri, Marcello Federico

Proceedings of the 50th Annual Meeting of the Association for Computational Linguistics, Proceedings of the Conference, July 8-14, 2012, Jeju Island, Korea, 2012

2011

CoSyne: a framework for multilingual content synchronization of wikis.

Christof Monz, Vivi Nastase, Matteo Negri, Angela Fahrni, Yashar Mehdad, Michael Strube

Proceedings of the 7th International Symposium on Wikis and Open Collaboration, 2011

FBK Participation in the RTE-7 Main Task.

Yashar Mehdad, José Guilherme Camargo de Souza, Matteo Negri, Alina Petrova

Proceedings of the Fourth Text Analysis Conference, 2011

Divide and Conquer: Crowdsourcing the Creation of Cross-Lingual Textual Entailment Corpora.

Matteo Negri, Luisa Bentivogli, Yashar Mehdad, Danilo Giampiccolo, Alessandro Marchetti

Proceedings of the 2011 Conference on Empirical Methods in Natural Language Processing, 2011

Is it Worth Submitting this Run? Assess your RTE System with a Good Sparring Partner.

Milen Kouylekov, Yashar Mehdad, Matteo Negri

Proceedings of the Workshop on Textual Entailment, 2011

Using Bilingual Parallel Corpora for Cross-Lingual Textual Entailment.

Yashar Mehdad, Matteo Negri, Marcello Federico

Proceedings of the 49th Annual Meeting of the Association for Computational Linguistics: Human Language Technologies, 2011

2010

FBK Participation in RTE6: Main and KBP Validation Task.

Milen Kouylekov, Matteo Negri, Yashar Mehdad, Elena Cabrio

Proceedings of the Third Text Analysis Conference, 2010

Creating a Bi-lingual Entailment Corpus through Translations with Mechanical Turk: $100 for a 10-day Rush.

Matteo Negri, Yashar Mehdad

Proceedings of the 2010 Workshop on Creating Speech and Language Data with Amazon's Mechanical Turk, 2010

Towards Cross-Lingual Textual Entailment.

Yashar Mehdad, Matteo Negri, Marcello Federico

Proceedings of the Human Language Technologies: Conference of the North American Chapter of the Association of Computational Linguistics, 2010

Syntactic/Semantic Structures for Textual Entailment Recognition.

Yashar Mehdad, Alessandro Moschitti, Fabio Massimo Zanzotto

Proceedings of the Human Language Technologies: Conference of the North American Chapter of the Association of Computational Linguistics, 2010

Mining Wikipedia for Large-scale Repositories of Context-Sensitive Entailment Rules.

Milen Kouylekov, Yashar Mehdad, Matteo Negri

Proceedings of the International Conference on Language Resources and Evaluation, 2010

2009

SemKer: Syntactic/Semantic Kernels for Recognizing Textual Entailment.

Yashar Mehdad, Alessandro Moschitti, Fabio Massimo Zanzotto

Proceedings of the Second Text Analysis Conference, 2009

Using Lexical Resources in a Distance-Based Approach to RTE.

Yashar Mehdad, Elena Cabrio, Matteo Negri, Milen Kouylekov, Bernardo Magnini

Proceedings of the Second Text Analysis Conference, 2009

Towards Extensible Textual Entailment Engines: The EDITS Package.

Matteo Negri, Milen Kouylekov, Bernardo Magnini, Yashar Mehdad, Elena Cabrio

Proceedings of the AI*IA 2009: Emergent Perspectives in Artificial Intelligence, 2009

Optimizing Textual Entailment Recognition Using Particle Swarm Optimization.

Yashar Mehdad, Bernardo Magnini

Proceedings of the 2009 Workshop on Applied Textual Inference, 2009

Automatic Cost Estimation for Tree Edit Distance Using Particle Swarm Optimization.

Yashar Mehdad

Proceedings of the ACL 2009, 2009