diff --git a/src/TensorFlowNET.Core/Attributes/c_api.ops.cs b/src/TensorFlowNET.Core/Attributes/c_api.ops.cs
index 9dc36fa8..4e99300d 100644
--- a/src/TensorFlowNET.Core/Attributes/c_api.ops.cs
+++ b/src/TensorFlowNET.Core/Attributes/c_api.ops.cs
@@ -18,7 +18,7 @@ namespace Tensorflow
         /// <param name="status">TF_Status*</param>
         /// <returns></returns>
         [DllImport(TensorFlowLibName)]
-        public static extern IntPtr TF_OperationGetAttrMetadata(IntPtr oper, string attr_name, IntPtr status);
+        public static extern TF_AttrMetadata TF_OperationGetAttrMetadata(IntPtr oper, string attr_name, IntPtr status);
 
         /// <summary>
         /// Fills in `value` with the value of the attribute `attr_name`.  `value` must
@@ -71,7 +71,7 @@ namespace Tensorflow
         /// <param name="value">const void*</param>
         /// <param name="length">size_t</param>
         [DllImport(TensorFlowLibName)]
-        public static extern void TF_SetAttrString(IntPtr desc, string attr_name, IntPtr value, uint length);
+        public static extern void TF_SetAttrString(IntPtr desc, string attr_name, string value, uint length);
 
         /// <summary>
         /// 
diff --git a/src/TensorFlowNET.Core/Operations/Operation.cs b/src/TensorFlowNET.Core/Operations/Operation.cs
index 5d1f4f83..a4b23294 100644
--- a/src/TensorFlowNET.Core/Operations/Operation.cs
+++ b/src/TensorFlowNET.Core/Operations/Operation.cs
@@ -145,6 +145,11 @@ namespace Tensorflow
             return ret;
         }
 
+        public TF_AttrMetadata GetAttributeMetadata(string attr_name, Status s)
+        {
+            return c_api.TF_OperationGetAttrMetadata(_handle, attr_name, s);
+        }
+
         public NodeDef GetNodeDef()
         {
             using (var s = new Status())
diff --git a/src/TensorFlowNET.Core/Operations/OperationDescription.cs b/src/TensorFlowNET.Core/Operations/OperationDescription.cs
index 38190c17..2e9016ff 100644
--- a/src/TensorFlowNET.Core/Operations/OperationDescription.cs
+++ b/src/TensorFlowNET.Core/Operations/OperationDescription.cs
@@ -8,6 +8,11 @@ namespace Tensorflow
     {
         private IntPtr _handle;
 
+        public OperationDescription(Graph graph, string opType, string opName)
+        {
+            _handle = c_api.TF_NewOperation(graph, opType, opName);
+        }
+
         public OperationDescription(IntPtr handle)
         {
             _handle = handle;
@@ -18,6 +23,16 @@ namespace Tensorflow
             c_api.TF_AddInputList(_handle, inputs, inputs.Length);
         }
 
+        public void SetAttrType(string attr_name, TF_DataType value)
+        {
+            c_api.TF_SetAttrType(_handle, attr_name, value);
+        }
+
+        public void SetAttrShape(string attr_name, long[] dims)
+        {
+            c_api.TF_SetAttrShape(_handle, attr_name, dims, dims.Length);
+        }
+
         public Operation FinishOperation(Status status)
         {
             return c_api.TF_FinishOperation(_handle, status);
diff --git a/src/TensorFlowNET.Core/Operations/TF_AttrMetadata.cs b/src/TensorFlowNET.Core/Operations/TF_AttrMetadata.cs
index 41ae6a3b..dd73da93 100644
--- a/src/TensorFlowNET.Core/Operations/TF_AttrMetadata.cs
+++ b/src/TensorFlowNET.Core/Operations/TF_AttrMetadata.cs
@@ -6,7 +6,7 @@ namespace Tensorflow
 {
     public struct TF_AttrMetadata
     {
-        public char is_list;
+        public byte is_list;
         public long list_size;
         public TF_AttrType type;
         public long total_size;
diff --git a/src/TensorFlowNET.Core/Operations/c_api.ops.cs b/src/TensorFlowNET.Core/Operations/c_api.ops.cs
index cb3ae75e..ac293dae 100644
--- a/src/TensorFlowNET.Core/Operations/c_api.ops.cs
+++ b/src/TensorFlowNET.Core/Operations/c_api.ops.cs
@@ -46,6 +46,16 @@ namespace Tensorflow
         [DllImport(TensorFlowLibName)]
         public static extern IntPtr TF_FinishOperation(IntPtr desc, IntPtr status);
 
+        /// <summary>
+        /// Operation will only be added to *graph when TF_FinishOperation() is
+        /// called (assuming TF_FinishOperation() does not return an error).
+        /// *graph must not be deleted until after TF_FinishOperation() is
+        /// called.
+        /// </summary>
+        /// <param name="graph">TF_Graph*</param>
+        /// <param name="opType">const char*</param>
+        /// <param name="oper_name">const char*</param>
+        /// <returns>TF_OperationDescription*</returns>
         [DllImport(TensorFlowLibName)]
         public static extern IntPtr TF_NewOperation(IntPtr graph, string opType, string oper_name);
 
diff --git a/test/TensorFlowNET.Examples/LinearRegression.cs b/test/TensorFlowNET.Examples/LinearRegression.cs
index b4535572..ae303fe9 100644
--- a/test/TensorFlowNET.Examples/LinearRegression.cs
+++ b/test/TensorFlowNET.Examples/LinearRegression.cs
@@ -42,6 +42,13 @@ namespace TensorFlowNET.Examples
             // Mean squared error
             var sub = pred - Y;
             var pow = tf.pow(sub, 2);
+
+
+
+
+
+
+
             var reduce = tf.reduce_sum(pow);
             var cost = reduce / (2d * n_samples);
 
diff --git a/test/TensorFlowNET.UnitTest/CApiAttributesTestcs.cs b/test/TensorFlowNET.UnitTest/CApiAttributesTestcs.cs
index 2a9db62d..b29e4393 100644
--- a/test/TensorFlowNET.UnitTest/CApiAttributesTestcs.cs
+++ b/test/TensorFlowNET.UnitTest/CApiAttributesTestcs.cs
@@ -65,12 +65,11 @@ namespace TensorFlowNET.UnitTest
         public void String()
         {
             var desc = init("string");
-            var handle = Marshal.StringToHGlobalAnsi("bunny");
-            c_api.TF_SetAttrString(desc, "v", handle, 5);
+            c_api.TF_SetAttrString(desc, "v", "bunny", 5);
 
-            //var oper = c_api.TF_FinishOperation(desc, s_);
-            //ASSERT_EQ(TF_Code.TF_OK, s_.Code);
-            //EXPECT_TF_META(oper, "v", -1, TF_AttrType.TF_ATTR_STRING, 5);
+            var oper = c_api.TF_FinishOperation(desc, s_);
+            ASSERT_EQ(TF_Code.TF_OK, s_.Code);
+            EXPECT_TF_META(oper, "v", -1, TF_AttrType.TF_ATTR_STRING, 5);
             //var value = new char[5];
 
             //c_api.TF_OperationGetAttrString(oper, "v", value, 5, s_);
@@ -78,6 +77,17 @@ namespace TensorFlowNET.UnitTest
             //EXPECT_EQ("bunny", value, 5));
         }
 
+        [TestMethod]
+        public void GetAttributesTest()
+        {
+            var desc = graph_.NewOperation("Placeholder", "node");
+            desc.SetAttrType("dtype", TF_DataType.TF_FLOAT);
+            long[] ref_shape = new long[3] { 1, 2, 3 };
+            desc.SetAttrShape("shape", ref_shape);
+            var oper = desc.FinishOperation(s_);
+            var metadata = oper.GetAttributeMetadata("shape", s_);
+        }
+
         public void Dispose()
         {
             graph_.Dispose();