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diff --git a/docs/mllib-guide.md b/docs/mllib-guide.md index a22a22184b..0cc5505b50 100644 --- a/docs/mllib-guide.md +++ b/docs/mllib-guide.md @@ -438,3 +438,54 @@ signals), you can use the trainImplicit method to get better results. # Build the recommendation model using Alternating Least Squares based on implicit ratings model = ALS.trainImplicit(ratings, 1, 20) {% endhighlight %} + + +# Singular Value Decomposition +Singular Value Decomposition for Tall and Skinny matrices. +Given an *m x n* matrix *A*, we can compute matrices *U, S, V* such that + +*A = U * S * V^T* + +There is no restriction on m, but we require n^2 doubles to +fit in memory locally on one machine. +Further, n should be less than m. + +The decomposition is computed by first computing *A^TA = V S^2 V^T*, +computing SVD locally on that (since n x n is small), +from which we recover S and V. +Then we compute U via easy matrix multiplication +as *U = A * V * S^-1* + +Only singular vectors associated with largest k singular values +are recovered. If there are k +such values, then the dimensions of the return will be: + +* *S* is *k x k* and diagonal, holding the singular values on diagonal. +* *U* is *m x k* and satisfies U^T*U = eye(k). +* *V* is *n x k* and satisfies V^TV = eye(k). + +All input and output is expected in sparse matrix format, 0-indexed +as tuples of the form ((i,j),value) all in +SparseMatrix RDDs. Below is example usage. + +{% highlight scala %} + +import org.apache.spark.SparkContext +import org.apache.spark.mllib.linalg.SVD +import org.apache.spark.mllib.linalg.SparseMatrix +import org.apache.spark.mllib.linalg.MatrixEntry + +// Load and parse the data file +val data = sc.textFile("mllib/data/als/test.data").map { line => + val parts = line.split(',') + MatrixEntry(parts(0).toInt, parts(1).toInt, parts(2).toDouble) +} +val m = 4 +val n = 4 +val k = 1 + +// recover largest singular vector +val decomposed = SVD.sparseSVD(SparseMatrix(data, m, n), k) +val = decomposed.S.data + +println("singular values = " + s.toArray.mkString) |