How can I use Mnist dataset in MapReduce project?

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I am new to MapReduce. I learnt about MapReduce through wordcount problem in which pair was easily understandable. But now I have Mnist data-set (normalized images) to train the Restricted Boltzmann Machine. I don't know how to use that data-set. How can I obtain pairs from the data-set and specially what will be the type of keys and values?

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