From a3672abdbedb39c963642ed2f8a1ea52fc9724ca Mon Sep 17 00:00:00 2001
From: pepure <pepure@163.com>
Date: Tue, 7 Jul 2020 13:09:19 +0800
Subject: [PATCH] Gradient Variable Test

---
 .../TF_API/GradientTest.cs                    | 47 +++++++++++++++++++
 1 file changed, 47 insertions(+)
 create mode 100644 test/TensorFlowNET.UnitTest/TF_API/GradientTest.cs

diff --git a/test/TensorFlowNET.UnitTest/TF_API/GradientTest.cs b/test/TensorFlowNET.UnitTest/TF_API/GradientTest.cs
new file mode 100644
index 00000000..0f91f93f
--- /dev/null
+++ b/test/TensorFlowNET.UnitTest/TF_API/GradientTest.cs
@@ -0,0 +1,47 @@
+using FluentAssertions;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using NumSharp;
+using System.Linq;
+using Tensorflow;
+using static Tensorflow.Binding;
+
+namespace Tensorflow.UnitTest.TF_API
+{
+    [TestClass]
+    public class GradientTest
+    {
+        [TestMethod]
+        public void GradientFloatTest()
+        {
+            var x = tf.Variable(3.0, dtype: TF_DataType.TF_FLOAT);
+            using var tape = tf.GradientTape();
+            var y = tf.square(x);
+            var y_grad = tape.gradient(y, x);
+            Assert.AreEqual(9.0f, (float)y);
+        }
+
+        [TestMethod]
+        public void GradientDefaultTest()
+        {//error 1#: Variable default type 
+            var x = tf.Variable(3.0);
+            using var tape = tf.GradientTape();
+            var y = tf.square(x);
+            var y_grad = tape.gradient(y, x);
+            Assert.AreEqual(9.0, (double)y);
+        }
+        [TestMethod]
+        public void GradientDoubleTest()
+        {//error 2#: Variable double type
+            var x = tf.Variable(3.0, dtype: TF_DataType.TF_DOUBLE);
+            using var tape = tf.GradientTape();
+            var y = tf.square(x);
+            var y_grad = tape.gradient(y, x);
+            Assert.AreEqual(9.0, (double)y);
+        }
+
+
+
+
+
+    }
+}