MatrixOps oonce used code derived from MTJ, but long ago was changed to an abstract class to help make any matrix library compatible. This removes outdated comments and properly describes the current class.
diff --git a/src/main/java/org/apache/datasketches/vector/decomposition/MatrixOps.java b/src/main/java/org/apache/datasketches/vector/decomposition/MatrixOps.java
index 7c5e57c..57f2ce5 100644
--- a/src/main/java/org/apache/datasketches/vector/decomposition/MatrixOps.java
+++ b/src/main/java/org/apache/datasketches/vector/decomposition/MatrixOps.java
@@ -16,39 +16,16 @@
* specific language governing permissions and limitations
* under the License.
*/
-
-//License header from the SVD.java file:
-/*
- * Copyright (C) 2003-2006 Bjørn-Ove Heimsund
- *
- * This file is part of MTJ.
- *
- * This library is free software; you can redistribute it and/or modify it
- * under the terms of the GNU Lesser General Public License as published by the
- * Free Software Foundation; either version 2.1 of the License, or (at your
- * option) any later version.
- *
- * This library is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
- * for more details.
- *
- * You should have received a copy of the GNU Lesser General Public License
- * along with this library; if not, write to the Free Software Foundation,
- * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
-
-
package org.apache.datasketches.vector.decomposition;
import org.apache.datasketches.vector.matrix.Matrix;
/**
- * Computes singular value decompositions and related Matrix operations needed by Frequent Directions.
- * May return as many singular values as exist, but other operations will limit output to k dimensions.
+ * Abstract class to wrap libraries to compute singular value
+ * decompositions and related Matrix operations needed by Frequent
+ * Directions. May return as many singular values as exist, but other
+ * operations will limit output to k dimensions.
*/
-// Directly derived from LGPL'd Matrix Toolkit for Java (MTL):
-// https://github.com/fommil/matrix-toolkits-java/blob/master/src/main/java/no/uib/cipr/matrix/SVD.java
abstract class MatrixOps {
// iterations for SISVD
