diff --git a/README.md b/README.md
index f1aa73f7..4d7d81d2 100644
--- a/README.md
+++ b/README.md
@@ -4,6 +4,8 @@ TensorFlow.NET provides .NET Standard binding for [TensorFlow](https://www.tenso
 
 TensorFlow.NET is a member project of SciSharp stack.
 
+![tensors_flowing](docs/assets/tensors_flowing.gif)
+
 ### How to use
 ```cs
 using tf = TensorFlowNET.Core.Tensorflow;
@@ -14,7 +16,7 @@ namespace TensorFlowNET.Examples
     {
         public void Run()
         {
-
+            var hello = tf.constant("Hello, TensorFlow!");
         }
     }
 }
diff --git a/src/TensorFlowNET.Core/Graph.cs b/src/TensorFlowNET.Core/Graph.cs
index 67c98366..696cf38a 100644
--- a/src/TensorFlowNET.Core/Graph.cs
+++ b/src/TensorFlowNET.Core/Graph.cs
@@ -14,10 +14,16 @@ namespace TensorFlowNET.Core
     public class Graph
     {
         public IntPtr handle;
+        private Dictionary<int, Operation> _nodes_by_id;
+        private Dictionary<string, Operation> _nodes_by_name;
+        public int _version;
+        private int _next_id_counter;
 
         public Graph(IntPtr graph)
         {
             this.handle = graph;
+            _nodes_by_id = new Dictionary<int, Operation>();
+            _nodes_by_name = new Dictionary<string, Operation>();
         }
 
         public unsafe Operation create_op(object inputs, string op_type = "", string name = "")
@@ -28,8 +34,26 @@ namespace TensorFlowNET.Core
             }
 
             var op = new Operation(this, inputs);
+            op.name = name;
 
             return op;
         }
+
+        public void _add_op(Operation op)
+        {
+            _nodes_by_id[op._id] = op;
+            //_nodes_by_name[op.name] = op;
+            _version = Math.Max(_version, op._id);
+        }
+
+        public int _next_id()
+        {
+            return ++_next_id_counter;
+        }
+
+        public void get_operations()
+        {
+
+        }
     }
 }
diff --git a/src/TensorFlowNET.Core/Operation.cs b/src/TensorFlowNET.Core/Operation.cs
index 78da3d47..ecfbe5e0 100644
--- a/src/TensorFlowNET.Core/Operation.cs
+++ b/src/TensorFlowNET.Core/Operation.cs
@@ -8,12 +8,17 @@ namespace TensorFlowNET.Core
     {
         private Graph _graph;
         private IntPtr _c_op;
+        public int _id => _id_value;
+        private int _id_value;
+        public string name;
 
         public Operation(Graph g, object inputs)
         {
             _graph = g;
 
+            _id_value = _graph._next_id();
             _c_op = ops._create_c_op(g, inputs);
+            _graph._add_op(this);
         }
     }
 }
diff --git a/src/TensorFlowNET.Core/c_api.cs b/src/TensorFlowNET.Core/c_api.cs
index e00c5bb7..b3303ba4 100644
--- a/src/TensorFlowNET.Core/c_api.cs
+++ b/src/TensorFlowNET.Core/c_api.cs
@@ -31,7 +31,7 @@ namespace TensorFlowNET.Core
         public static unsafe extern TF_Status TF_NewStatus();
 
         [DllImport(TensorFlowLibName)]
-        public static extern unsafe TF_Tensor TF_NewTensor(TF_DataType dataType, IntPtr zeroDims, int num_dims, IntPtr data, size_t len, Deallocator deallocator, IntPtr deallocator_arg);
+        public static extern unsafe TF_Tensor TF_NewTensor(TF_DataType dataType, Int64 dims, int num_dims, IntPtr data, size_t len, Deallocator deallocator, IntPtr deallocator_arg);
 
         [DllImport(TensorFlowLibName)]
         public static extern unsafe void TF_SetAttrTensor(TF_OperationDescription desc, string attr_name, TF_Tensor value, TF_Status status);
diff --git a/src/TensorFlowNET.Core/ops.cs b/src/TensorFlowNET.Core/ops.cs
index 7e96f365..252fdbf6 100644
--- a/src/TensorFlowNET.Core/ops.cs
+++ b/src/TensorFlowNET.Core/ops.cs
@@ -26,7 +26,7 @@ namespace TensorFlowNET.Core
                 case double value:
                     var v = (double*)Marshal.AllocHGlobal(sizeof(double));
                     *v = value;
-                    tensor = c_api.TF_NewTensor(TF_DataType.TF_DOUBLE, IntPtr.Zero, 0, data: (IntPtr)v, len: (UIntPtr)sizeof(double), deallocator: Tensorflow.FreeTensorDataDelegate, deallocator_arg: IntPtr.Zero);
+                    tensor = c_api.TF_NewTensor(TF_DataType.TF_DOUBLE, 0, 0, data: (IntPtr)v, len: (UIntPtr)sizeof(double), deallocator: Tensorflow.FreeTensorDataDelegate, deallocator_arg: IntPtr.Zero);
                     c_api.TF_SetAttrType(op_desc, "dtype", TF_DataType.TF_DOUBLE);
                     break;
             }