| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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.apache.ignite.examples.ml.tree; |
| |
| import java.io.IOException; |
| import org.apache.ignite.Ignite; |
| import org.apache.ignite.IgniteCache; |
| import org.apache.ignite.Ignition; |
| import org.apache.ignite.examples.ml.util.MLSandboxDatasets; |
| import org.apache.ignite.examples.ml.util.SandboxMLCache; |
| import org.apache.ignite.ml.IgniteModel; |
| import org.apache.ignite.ml.dataset.feature.extractor.Vectorizer; |
| import org.apache.ignite.ml.dataset.feature.extractor.impl.DummyVectorizer; |
| import org.apache.ignite.ml.environment.LearningEnvironmentBuilder; |
| import org.apache.ignite.ml.math.primitives.vector.Vector; |
| import org.apache.ignite.ml.regressions.logistic.LogisticRegressionSGDTrainer; |
| import org.apache.ignite.ml.selection.scoring.evaluator.Evaluator; |
| import org.apache.ignite.ml.selection.split.TrainTestDatasetSplitter; |
| import org.apache.ignite.ml.selection.split.TrainTestSplit; |
| import org.apache.ignite.ml.trainers.DatasetTrainer; |
| import org.apache.ignite.ml.tree.DecisionTreeClassificationTrainer; |
| |
| /** |
| * Example of using classification algorithms for fraud detection problem. |
| * <p> |
| * Description of models can be found in: https://en.wikipedia.org/wiki/Logistic_regression and |
| * https://en.wikipedia.org/wiki/Decision_tree_learning . Original dataset can be downloaded from: |
| * https://www.kaggle.com/mlg-ulb/creditcardfraud/ . Copy of dataset are stored in: |
| * modules/ml/src/main/resources/datasets/fraud_detection.csv . Score for clusterizer estimation: accuracy, recall, |
| * precision, f1-score . Description of entropy can be found in: https://en.wikipedia.org/wiki/Evaluation_of_binary_classifiers |
| * . |
| */ |
| public class FraudDetectionExample { |
| /** Run example. */ |
| public static void main(String[] args) throws IOException { |
| try (Ignite ignite = Ignition.start("examples/config/example-ignite.xml")) { |
| System.out.println(">>> Ignite grid started."); |
| |
| IgniteCache<Integer, Vector> dataCache = null; |
| try { |
| System.out.println(">>> Fill dataset cache."); |
| dataCache = new SandboxMLCache(ignite).fillCacheWith(MLSandboxDatasets.FRAUD_DETECTION); |
| |
| // This vectorizer works with values in cache of Vector class. |
| Vectorizer<Integer, Vector, Integer, Double> vectorizer = new DummyVectorizer<Integer>() |
| .labeled(Vectorizer.LabelCoordinate.LAST); // LAST means "label are stored at last coordinate of vector" |
| |
| // Splits dataset to train and test samples with 80/20 proportion. |
| TrainTestSplit<Integer, Vector> split = new TrainTestDatasetSplitter<Integer, Vector>().split(0.8); |
| |
| System.out.println(">>> Perform logistic regression."); |
| trainAndEstimateModel(ignite, dataCache, |
| new LogisticRegressionSGDTrainer() |
| .withEnvironmentBuilder(LearningEnvironmentBuilder.defaultBuilder().withRNGSeed(0)), |
| vectorizer, split |
| ); |
| |
| System.out.println("\n\n>>> Perform decision tree classifier."); |
| trainAndEstimateModel(ignite, dataCache, |
| new DecisionTreeClassificationTrainer() |
| .withMaxDeep(10.) |
| .withEnvironmentBuilder(LearningEnvironmentBuilder.defaultBuilder().withRNGSeed(0)), |
| vectorizer, split |
| ); |
| } |
| finally { |
| if (dataCache != null) |
| dataCache.destroy(); |
| } |
| } |
| finally { |
| System.out.flush(); |
| } |
| } |
| |
| /** |
| * Train model and estimate it. |
| * |
| * @param ignite Ignite |
| * @param dataCache Data set cache. |
| * @param trainer Trainer. |
| * @param vectorizer Upstream vectorizer. |
| * @param splitter Train test splitter. |
| */ |
| private static void trainAndEstimateModel(Ignite ignite, |
| IgniteCache<Integer, Vector> dataCache, |
| DatasetTrainer<? extends IgniteModel<Vector, Double>, Double> trainer, |
| Vectorizer<Integer, Vector, Integer, Double> vectorizer, TrainTestSplit<Integer, Vector> splitter) { |
| System.out.println(">>> Start training."); |
| IgniteModel<Vector, Double> mdl = trainer.fit( |
| ignite, dataCache, |
| splitter.getTrainFilter(), |
| vectorizer |
| ); |
| |
| System.out.println(">>> Perform scoring."); |
| System.out.println(Evaluator.evaluateBinaryClassification(dataCache, splitter.getTestFilter(), mdl, vectorizer)); |
| } |
| } |