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Some fun with Apache Wayang and Spark / Tensorflow

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Apache Wayang is an open-source Federated Learning (FL) framework developed by the Apache Software Foundation. It provides a platform for distributed machine learning, with a focus on ease of use and flexibility. It supports multiple FL scenarios and provides a variety of tools and components for building FL systems. It also includes support for various communication protocols and data formats, as well as integration with other Apache projects such as Apache Kafka and Apache Pulsar for data streaming. The project aims to make it easier to develop and deploy machine learning models in decentralized environments.

It's important to note that this are just examples and they may not be the way for your project to interact with Apache Wayang, you may need to check the documentation of the Apache Wayang project (https://wayang.apache.org) to see how to interact with it. I just point out how easy it is to use different languages to interact between Wayang and Spark.

Also, you need to make sure that you have the correct permissions and credentials to interact with the Wayang API and make changes to the Spark cluster.

Wayang - Scala - Spark:

import org.apache.wayang.{Wayang, WayangClient}

class SparkScaler(wayangUrl: String) {
    val wayang = new WayangClient(wayangUrl)

    def scaleUp(numWorkers: Int): Unit = {
        wayang.addWorkers(numWorkers)
    }

    def scaleDown(numWorkers: Int): Unit = {
        wayang.removeWorkers(numWorkers)
    }
}

The SparkScaler class takes a single parameter, the URL of the Wayang API endpoint, when it is initialized. The scaleUp() method can be called to add a specified number of workers to the Spark cluster, and the scaleDown() method can be called to remove a specified number of workers.

Wayang - Python - Spark

from apache_wayang import Wayang

class SparkScaler:
    def __init__(self, wayang_url):
        self.wayang = Wayang(wayang_url)

    def scale_up(self, num_workers):
        self.wayang.add_workers(num_workers)

    def scale_down(self, num_workers):
        self.wayang.remove_workers(num_workers)

The SparkScaler class takes a single parameter, the URL of the Wayang API endpoint, when it is initialized. The scale_up() method can be called to add a specified number of workers to the Spark cluster, and the scale_down() method can be called to remove a specified number of workers.

Wayang - Java Streams - Spark

import org.apache.wayang.WayangClient;
import java.util.stream.IntStream;

public class SparkScaler {
    private WayangClient wayang;

    public SparkScaler(String wayangUrl) {
        wayang = new WayangClient(wayangUrl);
    }

    public void scaleUp(int numWorkers) {
        IntStream.range(0, numWorkers).forEach(i -> wayang.addWorker());
    }

    public void scaleDown(int numWorkers) {
        IntStream.range(0, numWorkers).forEach(i -> wayang.removeWorker());
    }
}

The SparkScaler class takes a single parameter, the URL of the Wayang API endpoint, when it is initialized. The scaleUp() method can be called to add a specified number of workers to the Spark cluster, and the scaleDown() method can be called to remove a specified number of workers.

Iterate the K-Means clustering algorithm from Apache Wayang to TensorFlow

import org.apache.wayang.WayangClient;
import org.tensorflow.Graph;
import org.tensorflow.Session;
import org.tensorflow.Tensor;

public class KMeansIteration {
    private WayangClient wayang;
    private Graph graph;
    private Session session;

    public KMeansIteration(String wayangUrl, String modelPath) {
        wayang = new WayangClient(wayangUrl);
        graph = new Graph();
        graph.importGraphDef(modelPath);
        session = new Session(graph);
    }

    public void iterate(Tensor input) {
        Tensor wayangOutput = wayang.runKMeans(input);
        Tensor tfOutput = session.runner().feed("input", wayangOutput).fetch("output").run().get(0);
        // Perform further processing on tfOutput
    }
}

That's are only examples to show how easy it can be to get started with FL and also get involved into Wayang as a developer. Also consider to contribute to the project, check the project under wayang.apache.org 

The KMeansIteration class takes two parameters, the URL of the Wayang API endpoint and the path of the TensorFlow model, when it is initialized. The iterate() method can be called with an input Tensor, it will pass it to the Wayang's K-Means clustering algorithm, it will receive the output, and then will pass it to the TensorFlow's model as an input.

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