1 files changed, 131 insertions, 0 deletions
diff --git a/tensorflow/java/src/test/java/org/tensorflow/op/core/GradientsTest.java b/tensorflow/java/src/test/java/org/tensorflow/op/core/GradientsTest.java
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+++ b/tensorflow/java/src/test/java/org/tensorflow/op/core/GradientsTest.java
@@ -0,0 +1,131 @@
+/* Copyright 2018 The TensorFlow Authors. All Rights Reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+==============================================================================*/
+
+package org.tensorflow.op.core;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertNotNull;
+import static org.junit.Assert.assertTrue;
+
+import java.util.Arrays;
+import org.junit.Test;
+import org.junit.runner.RunWith;
+import org.junit.runners.JUnit4;
+import org.tensorflow.Graph;
+import org.tensorflow.Output;
+import org.tensorflow.Session;
+import org.tensorflow.Tensor;
+import org.tensorflow.Tensors;
+import org.tensorflow.TestUtil;
+import org.tensorflow.op.Scope;
+
+@RunWith(JUnit4.class)
+public class GradientsTest {
+
+  @Test
+  public void createGradients() {
+    try (Graph g = new Graph();
+        Session sess = new Session(g)) {
+      Scope scope = new Scope(g);
+
+      Output<Float> x = TestUtil.placeholder(g, "x1", Float.class);
+      Output<Float> y0 = TestUtil.square(g, "y0", x);
+      Output<Float> y1 = TestUtil.square(g, "y1", y0);
+
+      Gradients grads = Gradients.create(scope, y1, Arrays.asList(x, y0));
+
+      assertNotNull(grads);
+      assertNotNull(grads.dy());
+      assertEquals(2, grads.dy().size());
+
+      try (Tensor<Float> c = Tensors.create(3.0f);
+          TestUtil.AutoCloseableList<Tensor<?>> outputs =
+              new TestUtil.AutoCloseableList<>(
+                  sess.runner().feed(x, c).fetch(grads.dy(0)).fetch(grads.dy(1)).run())) {
+
+        assertEquals(108.0f, outputs.get(0).floatValue(), 0.0f);
+        assertEquals(18.0f, outputs.get(1).floatValue(), 0.0f);
+      }
+    }
+  }
+
+  @Test
+  public void createGradientsWithSum() {
+    try (Graph g = new Graph();
+        Session sess = new Session(g)) {
+      Scope scope = new Scope(g);
+
+      Output<Float> x = TestUtil.placeholder(g, "x1", Float.class);
+      Output<Float> y0 = TestUtil.square(g, "y0", x);
+      Output<Float> y1 = TestUtil.square(g, "y1", y0);
+
+      Gradients grads = Gradients.create(scope, Arrays.asList(y0, y1), Arrays.asList(x));
+
+      assertNotNull(grads);
+      assertNotNull(grads.dy());
+      assertEquals(1, grads.dy().size());
+
+      try (Tensor<Float> c = Tensors.create(3.0f);
+          TestUtil.AutoCloseableList<Tensor<?>> outputs =
+              new TestUtil.AutoCloseableList<>(sess.runner().feed(x, c).fetch(grads.dy(0)).run())) {
+
+        assertEquals(114.0f, outputs.get(0).floatValue(), 0.0f);
+      }
+    }
+  }
+
+  @Test
+  public void createGradientsWithInitialValues() {
+    try (Graph g = new Graph();
+        Session sess = new Session(g)) {
+      Scope scope = new Scope(g);
+
+      Output<Float> x = TestUtil.placeholder(g, "x1", Float.class);
+      Output<Float> y0 = TestUtil.square(g, "y0", x);
+      Output<Float> y1 = TestUtil.square(g, "y1", y0);
+
+      Gradients grads0 = Gradients.create(scope, y1, Arrays.asList(y0));
+      Gradients grads1 = Gradients.create(scope, y0, Arrays.asList(x), Gradients.dx(grads0.dy()));
+
+      assertNotNull(grads1);
+      assertNotNull(grads1.dy());
+      assertEquals(1, grads1.dy().size());
+
+      try (Tensor<Float> c = Tensors.create(3.0f);
+          TestUtil.AutoCloseableList<Tensor<?>> outputs =
+              new TestUtil.AutoCloseableList<>(
+                  sess.runner().feed(x, c).fetch(grads1.dy(0)).run())) {
+
+        assertEquals(108.0f, outputs.get(0).floatValue(), 0.0f);
+      }
+    }
+  }
+
+  @Test
+  public void validateGradientsNames() {
+    try (Graph g = new Graph()) {
+      Scope scope = new Scope(g).withSubScope("sub");
+
+      Output<Float> x = TestUtil.placeholder(g, "x1", Float.class);
+      Output<Float> y = TestUtil.square(g, "y", x);
+
+      Gradients grad0 = Gradients.create(scope, y, Arrays.asList(x));
+      assertTrue(grad0.dy(0).op().name().startsWith("sub/Gradients/"));
+
+      Gradients grad1 = Gradients.create(scope.withName("MyGradients"), y, Arrays.asList(x));
+      assertTrue(grad1.dy(0).op().name().startsWith("sub/MyGradients/"));
+    }
+  }
+}