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| Content Provider | ACM Digital Library |
|---|---|
| Author | Bedathur, Srikanta Berberich, Klaus |
| Abstract | Statistics about n-grams (i.e., sequences of contiguous words or other tokens in text documents or other string data) are an important building block in information retrieval and natural language processing. In this work, we study how n-gram statistics, optionally restricted by a maximum n-gram length and minimum collection frequency, can be computed efficiently harnessing MapReduce for distributed data processing. We describe different algorithms, ranging from an extension of word counting, via methods based on the Apriori principle, to a novel method Suffix-σ that relies on sorting and aggregating suffixes. We examine possible extensions of our method to support the notions of maximality/closedness and to perform aggregations beyond occurrence counting. Assuming Hadoop as a concrete Map-Reduce implementation, we provide insights on an efficient implementation of the methods. Extensive experiments on The New York Times Annotated Corpus and ClueWeb09 expose the relative benefits and trade-offs of the methods. |
| Starting Page | 101 |
| Ending Page | 112 |
| Page Count | 12 |
| File Format | |
| ISBN | 9781450315975 |
| DOI | 10.1145/2452376.2452389 |
| Language | English |
| Publisher | Association for Computing Machinery (ACM) |
| Publisher Date | 2013-03-18 |
| Publisher Place | New York |
| Access Restriction | Subscribed |
| Subject Keyword | Mapreduce N-grams |
| Content Type | Text |
| Resource Type | Article |
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