Adding source code for the tutorial tracked under BAEL-2759 (#6533)

pom.xml

@@ -526,6 +526,9 @@
                 <module>rxjava</module>
                 <module>rxjava-2</module> 
 			    <module>software-security/sql-injection-samples</module>
+				
+				<module>tensorflow-java</module>
+				
 			</modules>
 
 		</profile>
@@ -742,6 +745,8 @@
                 <module>xml</module>
                 <module>xmlunit-2</module>
                 <module>xstream</module>
+				
+				<module>tensorflow-java</module>
                 
             </modules>
 

tensorflow-java/.gitignore

@@ -0,0 +1,6 @@
+/.settings
+/model
+/target
+.classpath
+.project
+.springBeans

tensorflow-java/README.md

@@ -0,0 +1,3 @@
+## Relevant articles:
+
+- [TensorFlow for Java](https://www.baeldung.com/xxxx)

tensorflow-java/pom.xml

@@ -0,0 +1,52 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+	<modelVersion>4.0.0</modelVersion>
+	<groupId>com.baeldung</groupId>
+	<artifactId>tensorflow-java</artifactId>
+	<version>1.0-SNAPSHOT</version>
+	<packaging>jar</packaging>
+	<url>http://maven.apache.org</url>
+
+	<parent>
+		<groupId>com.baeldung</groupId>
+		<artifactId>parent-modules</artifactId>
+		<version>1.0.0-SNAPSHOT</version>
+	</parent>
+
+	<properties>
+		<java.version>1.8</java.version>
+		<tensorflow.version>1.12.0</tensorflow.version>
+		<junit.jupiter.version>5.4.0</junit.jupiter.version>
+	</properties>
+
+	<dependencies>
+		<dependency>
+			<groupId>org.tensorflow</groupId>
+			<artifactId>tensorflow</artifactId>
+			<version>${tensorflow.version}</version>
+		</dependency>
+		<dependency>
+			<groupId>org.junit.jupiter</groupId>
+			<artifactId>junit-jupiter-api</artifactId>
+			<version>${junit.jupiter.version}</version>
+			<scope>test</scope>
+		</dependency>
+		<dependency>
+			<groupId>org.junit.jupiter</groupId>
+			<artifactId>junit-jupiter-engine</artifactId>
+			<version>${junit.jupiter.version}</version>
+			<scope>test</scope>
+		</dependency>
+	</dependencies>
+
+	<build>
+		<plugins>
+			<plugin>
+				<groupId>org.springframework.boot</groupId>
+				<artifactId>spring-boot-maven-plugin</artifactId>
+			</plugin>
+		</plugins>
+	</build>
+</project>

tensorflow-java/src/main/java/org/baeldung/tensorflow/TensorflowGraph.java

@@ -0,0 +1,41 @@
+package org.baeldung.tensorflow;
+
+import org.tensorflow.DataType;
+import org.tensorflow.Graph;
+import org.tensorflow.Operation;
+import org.tensorflow.Session;
+import org.tensorflow.Tensor;
+
+public class TensorflowGraph {
+
+	public static Graph createGraph() {
+		Graph graph = new Graph();
+		Operation a = graph.opBuilder("Const", "a").setAttr("dtype", DataType.fromClass(Double.class))
+				.setAttr("value", Tensor.<Double>create(3.0, Double.class)).build();
+		Operation b = graph.opBuilder("Const", "b").setAttr("dtype", DataType.fromClass(Double.class))
+				.setAttr("value", Tensor.<Double>create(2.0, Double.class)).build();
+		Operation x = graph.opBuilder("Placeholder", "x").setAttr("dtype", DataType.fromClass(Double.class)).build();
+		Operation y = graph.opBuilder("Placeholder", "y").setAttr("dtype", DataType.fromClass(Double.class)).build();
+		Operation ax = graph.opBuilder("Mul", "ax").addInput(a.output(0)).addInput(x.output(0)).build();
+		Operation by = graph.opBuilder("Mul", "by").addInput(b.output(0)).addInput(y.output(0)).build();
+		graph.opBuilder("Add", "z").addInput(ax.output(0)).addInput(by.output(0)).build();
+		return graph;
+	}
+
+	public static Object runGraph(Graph graph, Double x, Double y) {
+		Object result;
+		try (Session sess = new Session(graph)) {
+			result = sess.runner().fetch("z").feed("x", Tensor.<Double>create(x, Double.class))
+					.feed("y", Tensor.<Double>create(y, Double.class)).run().get(0).expect(Double.class)
+					.doubleValue();
+		}
+		return result;
+	}
+
+	public static void main(String[] args) {
+		Graph graph = TensorflowGraph.createGraph();
+		Object result = TensorflowGraph.runGraph(graph, 3.0, 6.0);
+		System.out.println(result);
+		graph.close();
+	}
+}

tensorflow-java/src/main/java/org/baeldung/tensorflow/TensorflowSavedModel.java

@@ -0,0 +1,14 @@
+package org.baeldung.tensorflow;
+
+import org.tensorflow.SavedModelBundle;
+import org.tensorflow.Tensor;
+
+public class TensorflowSavedModel {
+
+	public static void main(String[] args) {
+		SavedModelBundle model = SavedModelBundle.load("./model", "serve");
+		Tensor<Integer> tensor = model.session().runner().fetch("z").feed("x", Tensor.<Integer>create(3, Integer.class))
+				.feed("y", Tensor.<Integer>create(3, Integer.class)).run().get(0).expect(Integer.class);
+		System.out.println(tensor.intValue());
+	}
+}

tensorflow-java/src/main/python/tensorflowGraph.py

@@ -0,0 +1,16 @@
+import tensorflow as tf
+graph = tf.Graph()
+builder = tf.saved_model.builder.SavedModelBuilder('./model')
+writer = tf.summary.FileWriter('.')
+with graph.as_default():
+  a = tf.constant(2, name='a')
+  b = tf.constant(3, name='b')
+  x = tf.placeholder(tf.int32, name='x')
+  y = tf.placeholder(tf.int32, name='y')
+  z = tf.math.add(a*x, b*y, name='z')
+  writer.add_graph(tf.get_default_graph())
+  writer.flush()
+  sess = tf.Session()
+  sess.run(z, feed_dict = {x: 2, y: 3})
+  builder.add_meta_graph_and_variables(sess, [tf.saved_model.tag_constants.SERVING])
+  builder.save()

tensorflow-java/src/test/java/org/baeldung/tensorflow/TensorflowGraphUnitTest.java

@@ -0,0 +1,21 @@
+package org.baeldung.tensorflow;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+import org.junit.Test;
+import org.tensorflow.Graph;
+
+public class TensorflowGraphUnitTest {
+	
+	@Test
+	public void givenTensorflowGraphWhenRunInSessionReturnsExpectedResult() {
+		
+		Graph graph = TensorflowGraph.createGraph();
+		Object result = TensorflowGraph.runGraph(graph, 3.0, 6.0);
+		assertEquals(21.0, result);
+		System.out.println(result);
+		graph.close();
+		
+	}
+
+}