Implement composite functions

1 files changed, 38 insertions, 0 deletions

diff --git a/vespajlib/src/main/java/com/yahoo/tensor/functions/Matmul.java b/vespajlib/src/main/java/com/yahoo/tensor/functions/Matmul.java
new file mode 100644
index 00000000000..4492ab083d4
--- /dev/null
+++ b/vespajlib/src/main/java/com/yahoo/tensor/functions/Matmul.java
@@ -0,0 +1,38 @@
+package com.yahoo.tensor.functions;
+
+import com.google.common.collect.ImmutableList;
+
+import java.util.List;
+
+/**
+ * @author bratseth
+ */
+public class Matmul extends CompositeTensorFunction {
+
+    private final TensorFunction argument1, argument2;
+    private final String dimension;
+    
+    public Matmul(TensorFunction argument1, TensorFunction argument2, String dimension) {
+        this.argument1 = argument1;
+        this.argument2 = argument2;
+        this.dimension = dimension;
+    }
+
+    @Override
+    public List<TensorFunction> functionArguments() { return ImmutableList.of(argument1, argument2); }
+
+    @Override
+    public PrimitiveTensorFunction toPrimitive() {
+        TensorFunction primitiveArgument1 = argument1.toPrimitive();
+        TensorFunction primitiveArgument2 = argument2.toPrimitive();
+        return new Reduce(new Join(primitiveArgument1, primitiveArgument2, ScalarFunctions.multiply()),
+                          Reduce.Aggregator.sum,
+                          dimension);
+    }
+    
+    @Override
+    public String toString(ToStringContext context) {
+        return "matmul(" + argument1.toString(context) + ", " + argument2.toString(context) + ", " + dimension + ")";
+    }
+
+}