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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 createGradientsWithScopeName() {
try (Graph g = new Graph()) {
Scope scope = new Scope(g);
Output<Float> x = TestUtil.placeholder(g, "x1", Float.class);
Output<Float> y = TestUtil.square(g, "y", x);
Scope gradScope = scope.withSubScope("grads").withSubScope("test");
Gradients grads = Gradients.create(gradScope, y, Arrays.asList(x));
assertTrue(grads.dy(0).op().name().startsWith("grads/test/"));
}
}
}
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