Operation: _update_inputs works now

src/TensorFlowNET.Core/Operations/Operation.cs

@@ -285,9 +285,12 @@ namespace Tensorflow
             var output = tensor._as_tf_output();
 
             // Reset cached inputs.
-            _inputs = null;// new InputList(new Tensor[] { tensor }); // is this right? original code: self._inputs_val=None
-            // TODO: implement below code dependencies
-            //c_api.UpdateEdge(_graph._c_graph, output, input);
+            _inputs = null; 
+            // after the c_api call next time _inputs is accessed 
+            // the updated inputs are reloaded from the c_api
+            c_api.TF_UpdateEdge(_graph, output, input, status);
+            //var updated_inputs = inputs;
+
         }
 
         private void _assert_same_graph(Tensor tensor)

test/TensorFlowNET.UnitTest/control_flow_ops_test/CondTestCases.cs

@@ -19,12 +19,12 @@ namespace TensorFlowNET.UnitTest.control_flow_ops_test
                 var y = tf.constant(5);
                 var z = control_flow_ops.cond(tf.less(x, y), () => tf.multiply(x, tf.constant(17)),
                     () => tf.add(y, tf.constant(23)));
-                //tf.train.export_meta_graph(@"D:\dev\tensorboard\logdir\sharp.meta", as_text: false);
+                tf.train.export_meta_graph(@"D:\dev\tensorboard\logdir\sharp.meta", as_text: false);
                 self.assertEquals(eval_scalar(z), 34);
             });
         }
 
-        [Ignore("This Test Fails due to missing edges in the graph!")]
+        //[Ignore("This Test Fails due to missing edges in the graph!")]
         [TestMethod]
         public void testCondFalse()
         {