1 files changed, 97 insertions, 0 deletions
diff --git a/vespajlib/src/test/java/com/yahoo/tensor/functions/MatmulTestCase.java b/vespajlib/src/test/java/com/yahoo/tensor/functions/MatmulTestCase.java
new file mode 100644
index 00000000000..9643c0a56e7
--- /dev/null
+++ b/vespajlib/src/test/java/com/yahoo/tensor/functions/MatmulTestCase.java
@@ -0,0 +1,97 @@
+package com.yahoo.tensor.functions;
+
+import com.google.common.collect.ImmutableList;
+import com.yahoo.tensor.Tensor;
+import com.yahoo.tensor.TensorType;
+import org.junit.Test;
+
+import static org.junit.Assert.assertEquals;
+
+/**
+ * @author bratseth
+ */
+public class MatmulTestCase {
+
+    @Test
+    public void testMatmul2d() {
+        // d0 is the 'outermost' dimension, etc.
+        Tensor.Builder ab = Tensor.Builder.of(TensorType.fromSpec("tensor(d0[2],d1[3])"));
+        ab.cell( 1,0, 0);
+        ab.cell( 2,0, 1);
+        ab.cell( 3,0, 2);
+        ab.cell( 4,1, 0);
+        ab.cell( 5,1, 1);
+        ab.cell( 6,1, 2);
+        Tensor a = ab.build();
+
+        Tensor.Builder bb = Tensor.Builder.of(TensorType.fromSpec("tensor(d0[3],d1[2])"));
+        bb.cell( 7,0, 0);
+        bb.cell( 8,0, 1);
+        bb.cell( 9,1, 0);
+        bb.cell(10,1, 1);
+        bb.cell(11,2, 0);
+        bb.cell(12,2, 1);
+        Tensor b = bb.build();
+
+        Tensor.Builder rb = Tensor.Builder.of(TensorType.fromSpec("tensor(d0[2],d1[2])"));
+        rb.cell( 58,0, 0);
+        rb.cell( 64,0, 1);
+        rb.cell(139,1, 0);
+        rb.cell(154,1, 1);
+        Tensor r = rb.build();
+
+        Tensor result = a.matmul(b.rename(ImmutableList.of("d0","d1"), ImmutableList.of("d1","d2")), "d1")
+                         .rename("d2","d1");
+        assertEquals(r, result);
+    }
+
+    @Test
+    public void testMatmul3d() {
+        // Convention: a is the 'outermost' dimension, etc.
+        Tensor.Builder ab = Tensor.Builder.of(TensorType.fromSpec("tensor(d0[2],d1[2],d2[3])"));
+        ab.cell( 1,0, 0, 0);
+        ab.cell( 2,0, 0, 1);
+        ab.cell( 3,0, 0, 2);
+        ab.cell( 4,0, 1, 0);
+        ab.cell( 5,0, 1, 1);
+        ab.cell( 6,0, 1, 2);
+        ab.cell( 7,1, 0, 0);
+        ab.cell( 8,1, 0, 1);
+        ab.cell( 9,1, 0, 2);
+        ab.cell(10,1, 1, 0);
+        ab.cell(11,1, 1, 1);
+        ab.cell(12,1, 1, 2);
+        Tensor a = ab.build();
+
+        Tensor.Builder bb = Tensor.Builder.of(TensorType.fromSpec("tensor(d0[2],d1[3],d2[2])"));
+        bb.cell(13,0, 0, 0);
+        bb.cell(14,0, 0, 1);
+        bb.cell(15,0, 1, 0);
+        bb.cell(16,0, 1, 1);
+        bb.cell(17,0, 2, 0);
+        bb.cell(18,0, 2, 1);
+        bb.cell(19,1, 0, 0);
+        bb.cell(20,1, 0, 1);
+        bb.cell(21,1, 1, 0);
+        bb.cell(22,1, 1, 1);
+        bb.cell(23,1, 2, 0);
+        bb.cell(24,1, 2, 1);
+        Tensor b = bb.build();
+
+        Tensor.Builder rb = Tensor.Builder.of(TensorType.fromSpec("tensor(d0[2],d1[2],d2[2])"));
+        rb.cell( 94,0, 0, 0);
+        rb.cell(100,0, 0, 1);
+        rb.cell(229,0, 1, 0);
+        rb.cell(244,0, 1, 1);
+        rb.cell(508,1, 0, 0);
+        rb.cell(532,1, 0, 1);
+        rb.cell(697,1, 1, 0);
+        rb.cell(730,1, 1, 1);
+        Tensor r = rb.build();
+
+        Tensor result = a.matmul(b.rename(ImmutableList.of("d1","d2"), ImmutableList.of("d2","d3")), "d2")
+                         .rename("d3","d2");
+        assertEquals(r, result);
+    }
+
+}