Fix RunInAutoMode.

Author: Oceania2018

src/TensorFlowNET.Core/Contexts/Context.AutoMode.cs

@@ -32,19 +32,25 @@ public T RunInAutoMode<T>(Func<T> graphAction, Func<T> eagerAction, params objec
         {
             if (tf.Context.has_graph_arg(args))
             {
-                return graphAction();
+                if (executing_eagerly())
+                {
+                    graph_mode();
+                    var result = graphAction();
+                    restore_mode();
+                    return result;
+                }
+                else
+                {
+                    return graphAction();
+                }
             }
             else
             {
-                try
+                if (tf.Context.executing_eagerly())
                 {
                     return eagerAction();
                 }
-                catch (InvalidArgumentError ex)
-                {
-                    throw ex;
-                }
-                catch (Exception ex)
+                else
                 {
                     return graphAction();
                 }

src/TensorFlowNET.Core/Variables/BaseResourceVariable.cs

@@ -162,7 +162,7 @@ void variable_accessed(BaseResourceVariable variable)
         /// read the value only after some condition is true.
         /// </summary>
         /// <returns></returns>
-        Tensor read_value()
+        protected Tensor read_value()
             => tf_with(ops.name_scope("Read"), delegate
             {
                 var value = _read_variable_op();

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

@@ -36,7 +36,7 @@ public Tensor _TensorConversionFunction(TF_DataType dtype = TF_DataType.DtInvali
             if (as_ref)
                 return handle;
             else
-                return AsTensor();
+                return GraphElement ?? read_value();
         }
     }
 }