How would you use a combiner to optimize your program

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Question: Show how MapReduce can be used to efficiently solve the following problem: Given a collection of input documents, output all bigrams with pointwise mutual information greater than a constant T. The pointwise mutual information of two words a,b is computed as P(a,b)/(P(a)P(b)), where P(a,b) is the probability they appear together as bigram a,b. Write pseudocode for map and reduce functions. How would you use a Combiner to optimize your program?

Reference no: EM133370251

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