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Playing with Java Deep Learning (DJL), tutorial-02 & tutorial-03 combined to a standalone executable script / published by https://github.com/dacr/code-examples-manager #250223b8-c123-4c71-9f24-c57f207d371e/dca35ae666b53733fe16f963383c141217464617
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// summary : Playing with Java Deep Learning (DJL), tutorial-02 & tutorial-03 combined to a standalone executable script | |
// keywords : djl, machine-learning, tutorial, ai, @testable | |
// publish : gist | |
// authors : David Crosson | |
// license : Apache NON-AI License Version 2.0 (https://raw.githubusercontent.com/non-ai-licenses/non-ai-licenses/main/NON-AI-APACHE2) | |
// id : 250223b8-c123-4c71-9f24-c57f207d371e | |
// created-on : 2021-03-05T09:23:01Z | |
// managed-by : https://github.com/dacr/code-examples-manager | |
// run-with : scala-cli $file | |
// --------------------- | |
//> using scala "3.3.1" | |
//> using dep "org.slf4j:slf4j-api:2.0.11" | |
//> using dep "org.slf4j:slf4j-simple:2.0.11" | |
//> using dep "ai.djl:api:0.26.0" | |
//> using dep "ai.djl:basicdataset:0.26.0" | |
//> using dep "ai.djl:model-zoo:0.26.0" | |
//> using dep "ai.djl.mxnet:mxnet-engine:0.26.0" | |
//> using dep "ai.djl.mxnet:mxnet-model-zoo:0.26.0" | |
////> using dep "net.java.dev.jna:jna:5.13.0" | |
// --------------------- | |
// inspired from https://docs.djl.ai/jupyter/tutorial/03_image_classification_with_your_model.html | |
System.setProperty("org.slf4j.simpleLogger.defaultLogLevel","debug") | |
import java.awt.image._ | |
import java.nio.file._ | |
import java.util._ | |
import java.util.stream._ | |
import ai.djl._ | |
import ai.djl.basicdataset.cv.classification.Mnist | |
import ai.djl.ndarray.types._ | |
import ai.djl.training._ | |
import ai.djl.training.dataset._ | |
import ai.djl.training.initializer._ | |
import ai.djl.training.loss._ | |
import ai.djl.training.listener._ | |
import ai.djl.training.evaluator._ | |
import ai.djl.training.optimizer._ | |
import ai.djl.training.util._ | |
import ai.djl.basicmodelzoo.cv.classification._ | |
import ai.djl.basicmodelzoo.basic._ | |
import ai.djl.ndarray._ | |
import ai.djl.modality._ | |
import ai.djl.modality.cv._ | |
import ai.djl.modality.cv.util.NDImageUtils | |
import ai.djl.translate._ | |
val modelPath = "build/mlp" | |
val modelDir = Paths.get(modelPath) | |
if (!modelDir.toFile.exists()) { | |
println("----------------- Prepare MNIST dataset for training") | |
val batchSize = 32 | |
val mnist = Mnist.builder.setSampling(batchSize, true).build | |
mnist.prepare(new ProgressBar) | |
println("----------------- Create your Model") | |
val model = Model.newInstance("mlp") | |
model.setBlock(new Mlp(28 * 28, 10, Array(128, 64))) | |
println("----------------- Create a Trainer") | |
val config = new DefaultTrainingConfig(Loss.softmaxCrossEntropyLoss()) | |
//softmaxCrossEntropyLoss is a standard loss for classification problems | |
.addEvaluator(new Accuracy()) // Use accuracy so we humans can understand how accurate the model is | |
.addTrainingListeners(TrainingListener.Defaults.logging() : _*) | |
val trainer = model.newTrainer(config) | |
println("----------------- Initialize Training") | |
trainer.initialize(new Shape(1, 28 * 28)) | |
println("----------------- Train your model") | |
val epoch = 5 | |
EasyTrain.fit(trainer, epoch, mnist, null) | |
println("----------------- Save your model") | |
Files.createDirectories(modelDir) | |
model.setProperty("Epoch", String.valueOf(epoch)) | |
model.save(modelDir, "mlp") | |
} | |
// ======================================================================================== | |
println("----------------- Load your model") | |
val model = Model.newInstance("mlp") | |
model.setBlock(new Mlp(28 * 28, 10, Array[Int](128, 64))) | |
model.load(modelDir) | |
println("----------------- Create a Translator") | |
val translator = new Translator[Image, Classifications] { | |
override def processInput(ctx:TranslatorContext, input:Image):NDList = { | |
// Convert Image to NDArray | |
val array = input.toNDArray(ctx.getNDManager(), Image.Flag.GRAYSCALE) | |
new NDList(NDImageUtils.toTensor(array)) | |
} | |
override def processOutput(ctx:TranslatorContext, list:NDList):Classifications = { | |
// Create a Classifications with the output probabilities | |
val probabilities = list.singletonOrThrow().softmax(0) | |
val classNames = | |
IntStream | |
.range(0, 10) | |
.mapToObj(_.toString) | |
.collect(Collectors.toList()) | |
new Classifications(classNames, probabilities); | |
} | |
override def getBatchifier():Batchifier = { | |
// The Batchifier describes how to combine a batch together | |
// Stacking, the most common batchifier, takes N [X1, X2, ...] arrays to a single [N, X1, X2, ...] array | |
Batchifier.STACK; | |
} | |
} | |
println("----------------- Create Predictor") | |
val predictor = model.newPredictor(translator) | |
println("----------------- Run inference") | |
0.to(9).foreach { num => | |
val url = s"https://mapland.fr/data/ai/images-numbers/$num.png" | |
val img = ImageFactory.getInstance().fromUrl(url) | |
//img.getWrappedImage() | |
val classifications = predictor.predict(img) | |
println(s"*** result for $num ($url)") | |
println(classifications) | |
} |
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