[systemml] branch master updated: [SYSTEMML-2296] Fix MNC sparsity estimator for unary operations

[mb...@apache.org]

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mboehm7 pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/systemml.git


The following commit(s) were added to refs/heads/master by this push:
     new 330635e  [SYSTEMML-2296] Fix MNC sparsity estimator for unary operations
330635e is described below

commit 330635e7f42dcd0036b7d1b529be530607f4dc81
Author: Matthias Boehm <mb...@gmail.com>
AuthorDate: Fri Apr 5 21:56:24 2019 +0200

    [SYSTEMML-2296] Fix MNC sparsity estimator for unary operations
---
 .../java/org/apache/sysml/hops/estim/EstimatorMatrixHistogram.java     | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/main/java/org/apache/sysml/hops/estim/EstimatorMatrixHistogram.java b/src/main/java/org/apache/sysml/hops/estim/EstimatorMatrixHistogram.java
index b079a7e..ac324f4 100644
--- a/src/main/java/org/apache/sysml/hops/estim/EstimatorMatrixHistogram.java
+++ b/src/main/java/org/apache/sysml/hops/estim/EstimatorMatrixHistogram.java
@@ -72,7 +72,8 @@ public class EstimatorMatrixHistogram extends SparsityEstimator
 		}
 		
 		//sketch propagation for intermediates other than final result
-		h2.setData(root.getRight().isLeaf() ? root.getRight().getData() : null);
+		if( h2 != null && root.getRight() != null )
+			h2.setData(root.getRight().isLeaf() ? root.getRight().getData() : null);
 		MatrixHistogram outMap = MatrixHistogram
 			.deriveOutputHistogram(h1, h2, ret, root.getOp(), root.getMisc());
 		root.setSynopsis(outMap);