Make the test code more general

mllib/src/main/scala/org/apache/spark/mllib/ann/BreezeUtil.scala

@@ -0,0 +1,51 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.spark.mllib.ann
+
+import breeze.linalg.{DenseMatrix => BDM, DenseVector => BDV}
+import com.github.fommil.netlib.BLAS.{getInstance => NativeBLAS}
+
+
+object BreezeUtil {
+
+  private def transposeString(a: BDM[Double]): String = if (a.isTranspose) "T" else "N"
+
+  // TODO: add code if matrices isTranspose!!!
+
+  def dgemm(alpha: Double, a: BDM[Double], b: BDM[Double], beta: Double, c: BDM[Double]): Unit = {
+    require(a.cols == b.rows, "A & B Dimension mismatch!")
+    require(a.rows == c.rows, "A & C Dimension mismatch!")
+    require(b.cols == c.cols, "A & C Dimension mismatch!")
+    if(a.rows == 0 || b.rows == 0 || a.cols == 0 || b.cols == 0) {
+
+    } else {
+      NativeBLAS.dgemm(transposeString(a), transposeString(b), c.rows, c.cols, a.cols,
+        alpha, a.data, a.offset, a.majorStride, b.data, b.offset, b.majorStride,
+        beta, c.data, c.offset, c.rows)
+    }
+  }
+
+  def gemv(alpha: Double, a: BDM[Double], x: BDV[Double], beta: Double, y: BDV[Double]): Unit = {
+
+    require(a.cols == x.length, "A & b Dimension mismatch!")
+
+    NativeBLAS.dgemv(transposeString(a), a.rows, a.cols,
+      alpha, a.data, a.offset, a.majorStride, x.data, x.offset, x.stride,
+      beta, y.data, y.offset, y.stride)
+  }
+}