add Concat Double Type problem describe

test/TensorFlowNET.UnitTest/TF_API/TensorOperate.cs

@@ -32,5 +32,25 @@ namespace Tensorflow.UnitTest.TF_API
             Assert.IsTrue(Enumerable.SequenceEqual(new[] { 2, 3, 1 }, a.shape));
             Assert.IsTrue(Enumerable.SequenceEqual(new[] { 2, 3, 1 }, b.shape));
         }
+        [TestMethod]
+        public void ConcatTest()
+        {
+            var a = tf.constant(new[,] { { 1, 2 }, { 3, 4 } });
+            var b = tf.constant(new[,] { { 5, 6 }, { 7, 8 } });
+            var c = tf.constant(new[,] { { 9, 10 }, { 11, 12 } });
+
+            var concatValue = tf.concat(new[] { a, b, c }, axis: 0);
+            Assert.IsTrue(Enumerable.SequenceEqual(new[] { 6, 2 }, concatValue.shape));
+        }
+        [TestMethod]
+        public void ConcatDoubleTest()
+        {//double type has some error
+            var a = tf.constant(new[,] { { 1.0, 2.0 }, { 3.0, 4.0 } });
+            var b = tf.constant(new[,] { { 5.0, 6.0 }, { 7.0, 8.0 } });
+            var c = tf.constant(new[,] { { 9.0, 10.0 }, { 11.0, 12.0 } });
+
+            var concatValue = tf.concat(new[] { a, b, c }, axis: 0);
+            Assert.IsTrue(Enumerable.SequenceEqual(new[] { 6, 2 }, concatValue.shape));
+        }
     }
 }