_ControlDependenciesController: fixed a bug related to stack order

src/TensorFlowNET.Core/Graphs/Graph.Control.cs

@@ -10,18 +10,8 @@ namespace Tensorflow
     {
         public IControlFlowContext _control_flow_context;
 
-        private Queue<_ControlDependenciesController> _graph_control_dependencies_stack = new Queue<_ControlDependenciesController>();
-        public Queue<_ControlDependenciesController> _control_dependencies_stack
-        {
-            get
-            {
-                return _graph_control_dependencies_stack;
-            }
-            set
-            {
-                _graph_control_dependencies_stack = value;
-            }
-        }
+        // represents the nested with(...) statements
+        public List<_ControlDependenciesController> _control_dependencies_stack { get; set; } = new List<_ControlDependenciesController>();
 
         /// <summary>
         /// For an op that takes `input_ops` as inputs, compute control inputs.
@@ -122,12 +112,12 @@ namespace Tensorflow
 
         public void _push_control_dependencies_controller(_ControlDependenciesController controller)
         {
-            _control_dependencies_stack.Enqueue(controller);
+            _control_dependencies_stack.Add(controller);
         }
 
         public void _pop_control_dependencies_controller(_ControlDependenciesController controller)
         {
-            _control_dependencies_stack.Dequeue();
+            _control_dependencies_stack.RemoveAt(_control_dependencies_stack.Count-1);
         }
 
         /// <summary>

src/TensorFlowNET.Core/Graphs/_ControlDependenciesController.cs

@@ -13,7 +13,7 @@ namespace Tensorflow
         private Graph _graph;
         private List<ITensorOrOperation> _control_inputs_val;
         private List<ITensorOrOperation> _seen_nodes;
-        private Queue<_ControlDependenciesController> _old_stack;
+        private List<_ControlDependenciesController> _old_stack;
         private bool _new_stack;
         private IControlFlowContext _old_control_flow_context;
 
@@ -73,7 +73,7 @@ namespace Tensorflow
             {
                 // Clear the control_dependencies graph.
                 _old_stack = _graph._control_dependencies_stack;
-                _graph._control_dependencies_stack = new Queue<_ControlDependenciesController>();
+                _graph._control_dependencies_stack = new List<_ControlDependenciesController>();
 
                 // Clear the control_flow_context too.
                 _old_control_flow_context = _graph._get_control_flow_context();

test/TensorFlowNET.UnitTest/ControlDependenciesTest.cs

@@ -161,7 +161,6 @@ namespace TensorFlowNET.UnitTest
             AssertItemsEqual(b_1.op.control_inputs, b_2.op.control_inputs);
         }
 
-        [Ignore("Fails")]
         [TestMethod]
         public void TestClear()
         {