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  "Description": "Methods for choosing the rank of an SVD (singular value\ndecomposition) approximation via cross validation. The package\nprovides both Gabriel-style \"block\" holdouts and Wold-style\n\"speckled\" holdouts. It also includes an implementation of the\nSVDImpute algorithm. For more information about\nBi-cross-validation, see Owen & Perry's 2009 AoAS article (at\n<arXiv:0908.2062>) and Perry's 2009 PhD thesis (at\n<arXiv:0909.3052>).",
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