scan unit test

test/TensorFlowNET.UnitTest/ManagedAPI/ControlFlowApiTest.cs

@@ -1,4 +1,5 @@
 using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NumSharp;
 using System;
 using Tensorflow;
 using static Tensorflow.Binding;
@@ -45,5 +46,21 @@ namespace TensorFlowNET.UnitTest.ManagedAPI
             var r = tf.while_loop(c, b, i);
             Assert.AreEqual(10, (int)r);
         }
+
+        [TestMethod, Ignore]
+        public void ScanFunctionGraphMode()
+        {
+            tf.compat.v1.disable_eager_execution();
+            Func<Tensor, Tensor, Tensor> fn = (prev, current) => tf.add(prev, current);
+            var input = tf.placeholder(TF_DataType.TF_FLOAT, new TensorShape(6));
+            var scan = tf.scan(fn, input);
+
+            using (var sess = tf.Session())
+            {
+                sess.run(tf.global_variables_initializer());
+                var result = sess.run(scan, new FeedItem(input, np.array(1, 2, 3, 4, 5, 6)));
+                Assert.AreEqual(new float[] { 1, 3, 6, 10, 15, 21 }, result.ToArray<float>());
+            }
+        }
     }
 }