change CondContext to IControlFlowContext in Operation and Graph.

src/TensorFlowNET.Core/Gradients/control_flow_grad.py.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.Text;
+using Tensorflow.Operations;
 
 namespace Tensorflow.Gradients
 {
@@ -13,7 +14,7 @@ namespace Tensorflow.Gradients
             var input_op = op.inputs[0].op;
             var graph = ops.get_default_graph();
             var op_ctxt = control_flow_util.GetOutputContext(input_op);
-            var pred = op_ctxt.pred;
+            var pred = (op_ctxt as CondContext).pred;
 
             var results = control_flow_ops._SwitchRefOrTensor(grad, pred, name: "cond_grad");
             return new Tensor[] { results.Item1, results.Item2 };

src/TensorFlowNET.Core/Operations/Operation.Control.cs

@@ -7,7 +7,7 @@ namespace Tensorflow
 {
     public partial class Operation
     {
-        private CondContext _control_flow_context;
+        private IControlFlowContext _control_flow_context;
 
         /// <summary>
         /// Add this op to its control flow context.
@@ -28,12 +28,12 @@ namespace Tensorflow
             }
         }
 
-        public void _set_control_flow_context(CondContext ctx)
+        public void _set_control_flow_context(IControlFlowContext ctx)
         {
             _control_flow_context = ctx;
         }
 
-        public CondContext _get_control_flow_context()
+        public IControlFlowContext _get_control_flow_context()
         {
             return _control_flow_context;
         }

src/TensorFlowNET.Core/Operations/Operation.cs

@@ -102,8 +102,12 @@ namespace Tensorflow
                 }
             }
 
+            // Dict mapping op name to file and line information for op colocation
+            // context managers.
+            _control_flow_context = graph._get_control_flow_context();
+
             // This will be set by self.inputs.
-            if(op_def == null)
+            if (op_def == null)
                 op_def = g.GetOpDef(node_def.Op);
 
             var grouped_inputs = _reconstruct_sequence_inputs(op_def, inputs, node_def.Attr);

src/TensorFlowNET.Core/Operations/control_flow_util.py.cs

@@ -27,7 +27,7 @@ namespace Tensorflow
             return op.type == "Switch" || op.type == "RefSwitch";
         }
 
-        public static CondContext GetOutputContext(Operation op)
+        public static IControlFlowContext GetOutputContext(Operation op)
         {
             var ctxt = op._get_control_flow_context();
 

src/TensorFlowNET.Core/TensorFlowNET.Core.csproj

@@ -4,7 +4,7 @@
     <TargetFramework>netstandard2.0</TargetFramework>
     <AssemblyName>TensorFlow.NET</AssemblyName>
     <RootNamespace>Tensorflow</RootNamespace>
-    <Version>0.4.2</Version>
+    <Version>0.5.0</Version>
     <Authors>Haiping Chen</Authors>
     <Company>SciSharp STACK</Company>
     <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
@@ -13,14 +13,13 @@
     <RepositoryType>git</RepositoryType>
     <PackageProjectUrl>https://github.com/SciSharp</PackageProjectUrl>
     <PackageIconUrl>https://avatars3.githubusercontent.com/u/44989469?s=200&amp;v=4</PackageIconUrl>
-    <PackageTags>TensorFlow, NumSharp, SciSharp, MachineLearning, TensorFlow.NET</PackageTags>
+    <PackageTags>TensorFlow, NumSharp, SciSharp, MachineLearning, TensorFlow.NET, C#</PackageTags>
     <Description>Google's TensorFlow binding in .NET Standard.
 Docs: https://tensorflownet.readthedocs.io</Description>
-    <AssemblyVersion>0.4.2.0</AssemblyVersion>
-    <PackageReleaseNotes>Added ConfigProto to control CPU and GPU resource.
-Fixed import name scope issue.</PackageReleaseNotes>
+    <AssemblyVersion>0.5.0.0</AssemblyVersion>
+    <PackageReleaseNotes>Add a lot of APIs to build neural networks model</PackageReleaseNotes>
     <LangVersion>7.2</LangVersion>
-    <FileVersion>0.4.2.0</FileVersion>
+    <FileVersion>0.5.0.0</FileVersion>
   </PropertyGroup>
 
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|AnyCPU'">