[mlpack-git] [mlpack/mlpack] The format of the sparse instances in the input file (#656)

[Yawei Zhao]

Hi, 

Since the input training data is often organized as the sparse matrix in many datasets, what is the format of such those sparse training instances presented in the input files? For example, if one training instance consists of 1000 dimensions, and 100 of those dimensions are not zero, then is the training instance presented in the input file by using 900 zeros and 100 non-zeros? The same sparse instances in the datasets which are published on the LibSVM website are organized as the format of "dimension_id : value". 

Best wishes,

Yawei

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