diff --git a/src/TensorFlowNET.Core/APIs/tf.linalg.cs b/src/TensorFlowNET.Core/APIs/tf.linalg.cs
new file mode 100644
index 00000000..ccfbbc2b
--- /dev/null
+++ b/src/TensorFlowNET.Core/APIs/tf.linalg.cs
@@ -0,0 +1,14 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Tensorflow
+{
+    public static partial class tf
+    {
+        public static unsafe Tensor matmul(Tensor a, Tensor b)
+        {
+            return gen_math_ops.mat_mul(a, b);
+        }
+    }
+}
diff --git a/src/TensorFlowNET.Core/Operations/OpDefLibrary.cs b/src/TensorFlowNET.Core/Operations/OpDefLibrary.cs
index aac58828..66fa8089 100644
--- a/src/TensorFlowNET.Core/Operations/OpDefLibrary.cs
+++ b/src/TensorFlowNET.Core/Operations/OpDefLibrary.cs
@@ -78,6 +78,9 @@ namespace Tensorflow
                     case "type":
                         attr_value.Type = _MakeType((TF_DataType)value, attr_def);
                         break;
+                    case "bool":
+                        attr_value.B = (bool)value;
+                        break;
                     case "shape":
                         attr_value.Shape = new TensorShapeProto();
                         break;
diff --git a/src/TensorFlowNET.Core/Operations/gen_math_ops.cs b/src/TensorFlowNET.Core/Operations/gen_math_ops.cs
index 6e95bc70..25aa2d8a 100644
--- a/src/TensorFlowNET.Core/Operations/gen_math_ops.cs
+++ b/src/TensorFlowNET.Core/Operations/gen_math_ops.cs
@@ -30,5 +30,18 @@ namespace Tensorflow
 
             return new Tensor(_op, 0, _op.OutputType(0));
         }
+
+        public static Tensor mat_mul(Tensor a, Tensor b, bool transpose_a = false, bool transpose_b = false)
+        {
+            var keywords = new Dictionary<string, object>();
+            keywords.Add("a", a);
+            keywords.Add("b", b);
+            keywords.Add("transpose_a", transpose_a);
+            keywords.Add("transpose_b", transpose_b);
+
+            var _op = _op_def_lib._apply_op_helper("MatMul", name: "MatMul", keywords: keywords);
+
+            return new Tensor(_op, 0, _op.OutputType(0));
+        }
     }
 }
diff --git a/test/TensorFlowNET.UnitTest/CApiAttributesTestcs.cs b/test/TensorFlowNET.UnitTest/CApiAttributesTestcs.cs
index da7294cd..2a9db62d 100644
--- a/test/TensorFlowNET.UnitTest/CApiAttributesTestcs.cs
+++ b/test/TensorFlowNET.UnitTest/CApiAttributesTestcs.cs
@@ -1,6 +1,7 @@
 using Microsoft.VisualStudio.TestTools.UnitTesting;
 using System;
 using System.Collections.Generic;
+using System.Runtime.InteropServices;
 using System.Text;
 using Tensorflow;
 
@@ -63,8 +64,9 @@ namespace TensorFlowNET.UnitTest
         [TestMethod]
         public void String()
         {
-            //var desc = init("string");
-            //c_api.TF_SetAttrString(desc, "v", "bunny", 5);
+            var desc = init("string");
+            var handle = Marshal.StringToHGlobalAnsi("bunny");
+            c_api.TF_SetAttrString(desc, "v", handle, 5);
 
             //var oper = c_api.TF_FinishOperation(desc, s_);
             //ASSERT_EQ(TF_Code.TF_OK, s_.Code);
diff --git a/test/TensorFlowNET.UnitTest/TensorFlowNET.UnitTest.csproj b/test/TensorFlowNET.UnitTest/TensorFlowNET.UnitTest.csproj
index 802d4c0c..f227365e 100644
--- a/test/TensorFlowNET.UnitTest/TensorFlowNET.UnitTest.csproj
+++ b/test/TensorFlowNET.UnitTest/TensorFlowNET.UnitTest.csproj
@@ -23,6 +23,7 @@
   </ItemGroup>
 
   <ItemGroup>
+    <ProjectReference Include="..\..\..\NumSharp\src\NumSharp.Core\NumSharp.Core.csproj" />
     <ProjectReference Include="..\..\src\TensorFlowNET.Core\TensorFlowNET.Core.csproj" />
   </ItemGroup>