yzhliu commented on a change in pull request #13162: [MXNET-1198] MXNet Java API URL: https://github.com/apache/incubator-mxnet/pull/13162#discussion_r233616770
########## File path: scala-package/mxnet-demo/java-demo/src/main/java/sample/ObjectDetection.java ########## @@ -0,0 +1,101 @@ +/* + * 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 sample; +import org.apache.mxnet.infer.javaapi.ObjectDetectorOutput; +import org.apache.mxnet.javaapi.*; +import org.apache.mxnet.infer.javaapi.ObjectDetector; +import org.apache.commons.io.FileUtils; +import java.io.File; +import java.net.URL; +import java.util.ArrayList; +import java.util.Arrays; +import java.util.List; + +public class ObjectDetection { + private static String modelPath; + private static String imagePath; + + private static void downloadUrl(String url, String filePath) { + File tmpFile = new File(filePath); + if (!tmpFile.exists()) { + try { + FileUtils.copyURLToFile(new URL(url), tmpFile); + } catch (Exception exception) { + System.err.println(exception); + } + } + } + + public static void downloadModelImage() { + String tempDirPath = System.getProperty("java.io.tmpdir"); + System.out.println("tempDirPath: %s".format(tempDirPath)); + imagePath = tempDirPath + "/inputImages/resnetssd/dog-ssd.jpg"; + String imgURL = "https://s3.amazonaws.com/model-server/inputs/dog-ssd.jpg";; + downloadUrl(imgURL, imagePath); + modelPath = tempDirPath + "resnetssd/resnet50_ssd_model"; + System.out.println("Download model files, this can take a while..."); + String modelURL = "https://s3.amazonaws.com/model-server/models/resnet50_ssd/";; + downloadUrl(modelURL + "resnet50_ssd_model-symbol.json", + tempDirPath + "/resnetssd/resnet50_ssd_model-symbol.json"); + downloadUrl(modelURL + "resnet50_ssd_model-0000.params", + tempDirPath + "/resnetssd/resnet50_ssd_model-0000.params"); + downloadUrl(modelURL + "synset.txt", + tempDirPath + "/resnetssd/synset.txt"); + } + + static List<List<ObjectDetectorOutput>> + runObjectDetectionSingle(String modelPathPrefix, String inputImagePath, List<Context> context) { + Shape inputShape = new Shape(new int[] {1, 3, 512, 512}); + List<DataDesc> inputDescriptors = new ArrayList<DataDesc>(); + inputDescriptors.add(new DataDesc("data", inputShape, DType.Float32(), "NCHW")); + ObjectDetector objDet = new ObjectDetector(modelPathPrefix, inputDescriptors, context, 0); + return objDet.imageObjectDetect(ObjectDetector.loadImageFromFile(inputImagePath), 3); + } + + public static void main(String[] args) { + List<Context> context = new ArrayList<Context>(); + if (System.getenv().containsKey("SCALA_TEST_ON_GPU") && + Integer.valueOf(System.getenv("SCALA_TEST_ON_GPU")) == 1) { + context.add(Context.gpu()); + } else { + context.add(Context.cpu()); + } + downloadModelImage(); + Shape inputShape = new Shape(new int[] {1, 3, 512, 512}); + Shape outputShape = new Shape(new int[] {1, 6132, 6}); + int width = inputShape.get(2); + int height = inputShape.get(3); + List<List<ObjectDetectorOutput>> output + = runObjectDetectionSingle(modelPath, imagePath, context); + String outputStr = "\n"; Review comment: better to use StringBuilder ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: [email protected] With regards, Apache Git Services
![https://s3.amazonaws.com/model-server/inputs/dog-ssd.jpg"](https://s3.amazonaws.com/model-server/inputs/dog-ssd.jpg"){kind=link}