Added test to make sure values generated when using streams are the same.

Author: ichbinstudent

src/test/java/org/apache/sysds/test/component/matrix/LibMatrixDatagenTest.java

@@ -30,6 +30,7 @@
 
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertTrue;
+import static org.junit.Assert.assertArrayEquals;
 
 public class LibMatrixDatagenTest {
 	protected static final Log LOG = LogFactory.getLog(LibMatrixDatagenTest.class.getName());
@@ -73,4 +74,15 @@ public void testGenerateUniformMatrixPhiloxShouldHaveGoodStatistics() {
 		double variance = Arrays.stream(bv).map(x -> Math.pow(x - mean, 2)).sum() / bv.length;
 		assertEquals("Variance should be 1", 0.0833, variance, 0.001);
 	}
+
+	@Test
+	public void testGenerateUniformMatrixShouldReturnSameValuesUsingStreams() {
+		MatrixBlock mb = new MatrixBlock();
+		RandomMatrixGenerator rgen = new RandomMatrixGenerator(RandomMatrixGenerator.PDF.UNIFORM, 1000, 1000, 100, 1, 0., 1.);
+		LibMatrixDatagen.generateRandomMatrix(mb, rgen, null, 0L);
+
+		double[] bv = Arrays.copyOf(mb.getDenseBlockValues(), 100);
+		double[] previous = new double[] {0.24053641567148587, 0.6374174253501083, 0.5504370051176339, 0.5975452777972018, 0.3332183994766498, 0.3851891847407185, 0.984841540199809, 0.8791825178724801, 0.9412491794821144, 0.27495396603548483, 0.12889715087377673, 0.14660165764651822, 0.023238122483889456, 0.5467397571984656, 0.9644868606768501, 0.10449068625097169, 0.6251463634655593, 0.4107961954910617, 0.7763122912749325, 0.990722785714783, 0.4872328470301428, 0.7462414053223305, 0.7331520701949938, 0.8172970714093244, 0.8388903500470183, 0.5266994346048661, 0.8993350116114935, 0.13393984058689223, 0.0830623982249149, 0.9785743401478403, 0.7223571191888487, 0.7150310138504744, 0.14322038530059678, 0.4629578184224229, 0.004485602182885184, 0.07149831487989411, 0.34842022979166454, 0.3387696535357536, 0.859356551354648, 0.9715469888517128, 0.8657458802140383, 0.6125811047098682, 0.17898798452881726, 0.21757041220968598, 0.8544871670422907, 0.009673497300974332, 0.6922930069529333, 0.7713129661706796, 0.7126874281456893, 0.2112353749298962, 0.7830924897671794, 0.945333238959629, 0.014236355103667941, 0.3942035527773311, 0.8537907753080728, 0.7860424508145526, 0.993471955005814, 0.883104405981479, 0.17029153024770394, 0.9620689182075386, 0.7242950335788688, 0.6773541612498745, 0.8043954172246357, 0.44142677367579175, 0.46208799028599445, 0.8528274665994607, 0.501834850205735, 0.9919429804102169, 0.9692699099404161, 0.35310607217911816, 0.047265869196129406, 0.0716236234178006, 0.02910751272163581, 0.48367019010510015, 0.9719501209537452, 0.9891171507514055, 0.7674421030154899, 0.5013973510122299, 0.2555253108964435, 0.30915818724818767, 0.8482805002723425, 0.052084538173983286, 0.010175454536229256, 0.35385296970871194, 0.08673785516572752, 0.8503115152643057, 0.0036769023557003955, 0.3078931676344727, 0.5316085562487977, 0.9188142018385732, 0.27721002606871137, 0.8742622102831944, 0.6098815135127635, 0.9086392096967358, 0.04449062015679506, 0.6467239010388895, 0.4968037636226561, 0.5067015959528527, 0.5206888198929495, 0.36636074451399603};
+		assertArrayEquals(previous, bv, 0.0001);
+	}
 }