Gradient Variable Test

test/TensorFlowNET.UnitTest/TF_API/GradientTest.cs

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+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);
+        }
+
+
+
+
+
+    }
+}