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i Data-Intensive Text Processing with MapReduce

IData-Intensive Text Processingwith MapReduceJimmy Lin and Chris DyerUniversity of Maryland, College ParkManuscript prepared April 11, 2010 This is the pre-production manuscript of a book in the Morgan & Claypool SynthesisLectures on Human Language Technologies. Anticipated publication date is .. ii1 Introduction .. in the Clouds .. Ideas .. Is This Different? .. This Book Is Not .. 172 MapReduce Basics .. Programming Roots .. and Reducers .. Execution Framework .. and Combiners .. Distributed File System .. Cluster Architecture .. 383 MapReduce Algorithm Design .. Aggregation .. Combiners and In-Mapper Algorithmic Correctness with Local and Stripes.

Data are called corpora (singular, corpus) by NLP researchers and collections by those from the IR community. Aspects of the representations of the data are called fea-tures, which may be \super cial" and easy to extract, such as the words and sequences ... a task known as sentiment analysis or opinion mining [118], which has been applied to ...

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