MNIST

This page illustrates a simple client-server interaction to perform inference on a TensorFlow model using the Java SDK for Konduit Serving.

This tutorial is split into two parts:

Configuration
Running the server

This tutorial is tested on TensorFlow 2.0.0.

import ai.konduit.serving.InferenceConfiguration;
import ai.konduit.serving.config.ParallelInferenceConfig;
import ai.konduit.serving.config.ServingConfig;
import ai.konduit.serving.configprovider.KonduitServingMain;
import ai.konduit.serving.configprovider.KonduitServingMainArgs;
import ai.konduit.serving.model.ModelConfig;
import ai.konduit.serving.model.ModelConfigType;
import ai.konduit.serving.model.TensorDataTypesConfig;
import ai.konduit.serving.model.TensorFlowConfig;
import ai.konduit.serving.pipeline.step.ImageLoadingStep;
import ai.konduit.serving.pipeline.step.ModelStep;
import ai.konduit.serving.verticles.inference.InferenceVerticle;
import com.mashape.unirest.http.Unirest;
import com.mashape.unirest.http.exceptions.UnirestException;
import org.apache.commons.io.FileUtils;
import org.datavec.api.writable.NDArrayWritable;
import org.datavec.api.writable.Writable;
import org.datavec.image.transform.ImageTransformProcess;
import org.nd4j.linalg.api.ndarray.INDArray;
import org.nd4j.linalg.io.ClassPathResource;
import org.nd4j.serde.binary.BinarySerde;
import org.nd4j.tensorflow.conversion.TensorDataType;

Overview

Konduit Serving works by defining a series of steps. These include operations such as

Pre- or post-processing steps
One or more machine learning models
Transforming the output in a way that can be understood by humans

If deploying your model does not require pre- nor post-processing, only one step - a machine learning model - is required. This configuration is defined using a single ModelStep.

Set the model file path to mnistmodelfilePath.

String tensorflow_version = "2.0.0";

String mnistmodelfilePath = new ClassPathResource("data/mnist/mnist_" + tensorflow_version + ".pb").getFile().getAbsolutePath();

A reference Java project is provided in the Example repository ( https://github.com/KonduitAI/konduit-serving-examples ) with a Maven pom.xml dependencies file. If using the IntelliJ IDEA IDE, open the java folder as a Maven project and run the main function of the InferenceModelStepMNIST class.

Configure the step

Define the TensorFlow configuration as a `TensorFlowConfig` object

tensorDataTypesConfig: The TensorFlowConfig object requires a HashMap input_data_types. Its keys should represent column names, and the values should represent data types as strings, e.g. "INT32","FLOAT",etc,. See here for a list of supported data types.
modelConfigType: This argument requires a ModelConfigType object. Specify modelType as TENSORFLOW, and modelLoadingPath to point to the location of TensorFlow weights saved in the PB file format.

HashMap<String, TensorDataType> input_data_types = new HashMap();
input_data_types.put("input_layer", TensorDataType.FLOAT);

ModelConfig mnistModelConfig = TensorFlowConfig.builder()
    .tensorDataTypesConfig(TensorDataTypesConfig.builder().
            inputDataTypes(input_data_types).build())

    .modelConfigType(ModelConfigType.builder().
            modelLoadingPath(mnistmodelfilePath.toString()).
            modelType(ModelConfig.ModelType.TENSORFLOW).build())
    .build();

Now that we have a TensorFlowConfig defined, we can define a ModelStep. The following parameters are specified:

modelConfig: pass the mnistModelConfig object here
parallelInferenceConfig: specify the number of workers to run in parallel. Here, we specify workers=1.
inputNames: names for the input data
outputNames: names for the output data

List<String> input_names = new ArrayList<String>(input_data_types.keySet());
ArrayList<String> output_names = new ArrayList<>();
output_names.add("output_layer/Softmax");

ModelStep mnistModelStep = ModelStep.builder()
    .modelConfig(mnistModelConfig)
    .inputNames(input_names)
    .outputNames(output_names)
    .parallelInferenceConfig(ParallelInferenceConfig.builder().workers(1).build())
    .build();

Configure the server

Specify the following:

httpPort: Specify any port number that is not reserved.

int port = Util.randInt(1000, 65535);

ServingConfig servingConfig = ServingConfig.builder()
    .httpPort(port)
    .build();

The ServingConfig has to be passed to Server in addition to the steps as a list. In this case, there is a single step: mnistModelStep.

InferenceConfiguration inferenceConfiguration = InferenceConfiguration.builder()
    .servingConfig(servingConfig)
    .step(mnistModelStep)
    .build();

The inferenceConfiguration is stored as a JSON File. Set the KonduitServingMainArgs with the saved config.json file path as configPath and other necessary server configuration arguments.

File configFile = new File("config.json");
FileUtils.write(configFile, inferenceConfiguration.toJson(), Charset.defaultCharset());

//Set and Start inference server as per the above configurations
KonduitServingMainArgs args1 = KonduitServingMainArgs.builder()
    .configStoreType("file").ha(false)
    .multiThreaded(false).configPort(port)
    .verticleClassName(InferenceVerticle.class.getName())
    .configPath(configFile.getAbsolutePath())
    .build();

Start server by calling KonduitServingMain with the configurations mentioned in the KonduitServingMainArgs using Callback Function(as per the code mentioned in the Inference Section below)

Inference

The image file(s) has to be converted into NDARRAY using ImageLoadingStep and passed as an input for inference.

ImageTransformProcess imageTransformProcess = new ImageTransformProcess.Builder()
    .scaleImageTransform(20.0f)
    .resizeImageTransform(28, 28)
    .build();

ImageLoadingStep imageLoadingStep = ImageLoadingStep.builder()
    .imageProcessingInitialLayout("NCHW")
    .imageProcessingRequiredLayout("NHWC")
    .inputName("default")
    .dimensionsConfig("default", new Long[]{240L, 320L, 3L}) // Height, width, channels
    .imageTransformProcess("default", imageTransformProcess)
    .build();

ArrayList<INDArray> imageArr = new ArrayList<>();
ArrayList<String> inputString = new ArrayList<>();
inputString.add("data/facedetector/1.jpg");

for (String imagePathStr : inputString) {
    String tmpInput = new ClassPathResource(imagePathStr).getFile().getAbsolutePath();
    Writable[][] tmpOutput = imageLoadingStep.createRunner().transform(tmpInput);
    INDArray tmpImage = ((NDArrayWritable) tmpOutput[0][0]).get();
    imageArr.add(tmpImage);
}

To configure the client, set the required URL to connect server and specify any port number that is not reserved (as used in server configuration).

A Callback Function onSuccess is implemented in order to post the Client request and get the HttpResponse, only after the successful run of the KonduitServingMain Server.

Accepted input and output data formats are as follows:

Input: JSON, ARROW, IMAGE, ND4J and NUMPY.
Output: NUMPY, JSON, ND4J and ARROW. {% endhint %}

Note that we consider only one test image in this example.

KonduitServingMain.builder()
    .onSuccess(() -> {
        try {
            for (INDArray indArray : imageArr) {

                File file = new File("src/main/resources/data/test-input.zip");
                BinarySerde.writeArrayToDisk(indArray, file);

                String result = Unirest.post(String.format("http://localhost:%s/raw/nd4j", port))
                        .field("input_layer", file)
                        .asString().getBody();

                System.out.println(result);
                System.exit(0);
            }
        } catch (UnirestException | IOException e) {
            e.printStackTrace();
            System.exit(0);
        }
    })
    .build()
    .runMain(args1.toArgs());

Confirm the output

After executing the above, in order to confirm the successful start of the Server, check for the below output text:

Jan 07, 2020 2:31:37 PM ai.konduit.serving.configprovider.KonduitServingMain
INFO: Deployed verticle ai.konduit.serving.verticles.inference.InferenceVerticle

The Output of the program is as follows:

System.out.println(result);

{
  "output_layer/Softmax" : {
    "batchId" : "8d7acc0d-5497-4882-89db-2b3a0772e480",
    "ndArray" : {
      "dataType" : "FLOAT",
      "shape" : [ 3, 10 ],
      "data" : [ 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0 ]
    }
  }
}

The complete inference configuration in JSON format is as follows:

System.out.println(inferenceConfiguration.toJson());

{
  "memMapConfig" : null,
  "servingConfig" : {
    "httpPort" : 19947,
    "listenHost" : "localhost",
    "logTimings" : false,
    "metricTypes" : [ "CLASS_LOADER", "JVM_MEMORY", "JVM_GC", "PROCESSOR", "JVM_THREAD", "LOGGING_METRICS", "NATIVE" ],
    "outputDataFormat" : "JSON",
    "uploadsDirectory" : "file-uploads/"
  },
  "steps" : [ {
    "@type" : "ModelStep",
    "inputColumnNames" : { },
    "inputNames" : [ "input_layer" ],
    "inputSchemas" : { },
    "modelConfig" : {
      "@type" : "TensorFlowConfig",
      "configProtoPath" : null,
      "modelConfigType" : {
        "modelLoadingPath" : "C:\\konduit-serving-examples\\java\\target\\classes\\data\\mnist\\mnist_2.0.0.pb",
        "modelType" : "TENSORFLOW"
      },
      "savedModelConfig" : null,
      "tensorDataTypesConfig" : {
        "inputDataTypes" : {
          "input_layer" : "FLOAT"
        },
        "outputDataTypes" : { }
      }
    },
    "normalizationConfig" : null,
    "outputColumnNames" : { },
    "outputNames" : [ "output_layer/Softmax" ],
    "outputSchemas" : { },
    "parallelInferenceConfig" : {
      "batchLimit" : 32,
      "inferenceMode" : "BATCHED",
      "maxTrainEpochs" : 1,
      "queueLimit" : 64,
      "vertxConfigJson" : null,
      "workers" : 1
    }
  } ]
}

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