Make Tensor packable.

Author: Oceania2018

src/TensorFlowNET.Core/Tensors/Tensor.Pack.cs

@@ -0,0 +1,15 @@
+using NumSharp;
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace Tensorflow
+{
+    public partial class Tensor
+    {
+        public Tensor Pack(object[] sequences)
+        {
+            return sequences[0] as Tensor;
+        }
+    }
+}

src/TensorFlowNET.Core/Tensors/Tensor.cs

@@ -39,7 +39,7 @@ namespace Tensorflow
     /// Internally, TensorFlow represents tensors as n-dimensional arrays of base datatypes.
     /// </summary>
     [SuppressMessage("ReSharper", "ConvertToAutoProperty")]
-    public partial class Tensor : DisposableObject, ITensorOrOperation, _TensorLike, ITensorOrTensorArray
+    public partial class Tensor : DisposableObject, ITensorOrOperation, _TensorLike, ITensorOrTensorArray, IPackable<Tensor>
     {
         private readonly int _id;
         private readonly Operation _op;

src/TensorFlowNET.Core/Tensors/TensorShape.cs

@@ -125,6 +125,9 @@ public TensorShape this[Slice slice]
         {
             get
             {
+                if (!slice.Stop.HasValue)
+                    slice.Stop = dims.Length - slice.Start + 1;
+
                 if (slice.Start.HasValue == false || slice.Length.HasValue == false)
                     throw new ArgumentException("Slice must has Start and Length.");