fix bksvd method

src/mlpack/methods/cf/decomposition_policies/block_krylov_svd_method.hpp

@@ -76,9 +76,9 @@ class BlockKrylovSVDPolicy
     // Do singular value decomposition using the block krylov SVD algorithm.
     RandomizedBlockKrylovSVD blockkrylovsvd;
     blockkrylovsvd.Apply(data, w, sigma, h, rank);
-    
+
     // Sigma matrix is multiplied to w.
-    w = w * sigma;
+    w = w * arma::diagmat(sigma);
 
     // Take transpose of the matrix h as required by CF class.
     h = arma::trans(h);