finished #140

src/TensorFlowNET.Core/Operations/Operation.cs

@@ -38,6 +38,10 @@ namespace Tensorflow
                 return;
 
             _handle = handle;
+
+            _outputs = new Tensor[NumOutputs];
+            for (int i = 0; i < NumOutputs; i++)
+                _outputs[i] = new Tensor(this, i, OutputType(i));
         }
 
         public Operation(Graph g, string opType, string oper_name)
@@ -99,7 +103,6 @@ namespace Tensorflow
 
             // Initialize self._outputs.
             output_types = new TF_DataType[NumOutputs];
-
             for (int i = 0; i < NumOutputs; i++)
                 output_types[i] = OutputType(i);
 

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

@@ -16,6 +16,11 @@ namespace Tensorflow
             return constant_op.Constant(scalar);
         }
 
+        public static implicit operator int(Tensor tensor)
+        {
+            return tensor.Data<int>()[0];
+        }
+
         public static implicit operator IntPtr(Tensor tensor)
         {
             return tensor._handle;

src/TensorFlowNET.Core/Variables/RefVariable.Implicit.cs

@@ -23,12 +23,6 @@ namespace Tensorflow
 
         public static implicit operator RefVariable(Tensor var)
         {
-            switch (var.dtype)
-            {
-                case TF_DataType.TF_INT32:
-                    return tf.Variable(var.Data<int>()[0]);
-            }
-
             return null;
         }
     }

test/TensorFlowNET.UnitTest/VariableTest.cs

@@ -43,7 +43,8 @@ namespace TensorFlowNET.UnitTest
         [TestMethod]
         public void Add()
         {
-            var x = tf.Variable(10, name: "x");
+            int result = 0;
+            Tensor x = tf.Variable(10, name: "x");
 
             var model = tf.global_variables_initializer();
             using (var session = tf.Session())
@@ -52,10 +53,12 @@ namespace TensorFlowNET.UnitTest
                 for(int i = 0; i < 5; i++)
                 {
                     x = x + 1;
-                    var result = session.run(x);
+                    result = session.run(x);
                     print(result);
                 }
             }
+
+            Assert.AreEqual(15, result);
         }
     }
 }