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SimpleDNN is a machine learning lightweight open-source library written in Kotlin whose purpose is to support the development of feed-forward and recurrent Artificial Neural Networks.

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/* Copyright 2016-present The KotlinNLP Authors. All Rights Reserved.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, you can obtain one at http://mozilla.org/MPL/2.0/.
 * ------------------------------------------------------------------*/

package mnist

import com.kotlinnlp.simplednn.core.optimizer.ParamsOptimizer
import com.kotlinnlp.simplednn.core.functionalities.activations.Softmax
import com.kotlinnlp.simplednn.core.neuralnetwork.preset.FeedforwardNeuralNetwork
import com.kotlinnlp.simplednn.helpers.training.FeedforwardTrainingHelper
import com.kotlinnlp.simplednn.core.neuralprocessor.feedforward.FeedforwardNeuralProcessor
import com.kotlinnlp.simplednn.dataset.*
import com.kotlinnlp.simplednn.core.functionalities.outputevaluation.ClassificationEvaluation
import com.kotlinnlp.simplednn.helpers.validation.FeedforwardValidationHelper
import com.kotlinnlp.simplednn.core.functionalities.losses.SoftmaxCrossEntropyCalculator
import com.kotlinnlp.simplednn.simplemath.ndarray.dense.DenseNDArray
import utils.exampleextractor.ClassificationExampleExtractor
import utils.CorpusReader
import Configuration
import com.kotlinnlp.simplednn.core.functionalities.activations.ReLU
import com.kotlinnlp.simplednn.core.functionalities.updatemethods.adam.ADAMMethod

fun main(args: Array) {

  println("Start 'MNIST Test'")

  val dataset = CorpusReader>().read(
    corpusPath = Configuration.loadFromFile().mnist.datasets_paths,
    exampleExtractor = ClassificationExampleExtractor(outputSize = 10),
    perLine = false)

  MNISTTest(dataset).start()

  println("End.")
}

/**
 *
 */
class MNISTTest(val dataset: Corpus>) {

  /**
   *
   */
  private val neuralNetwork = FeedforwardNeuralNetwork(
    inputSize = 784,
    hiddenSize = 500,
    hiddenActivation = ReLU(),
    outputSize = 10,
    outputActivation = Softmax())

  /**
   *
   */
  fun start() {
    this.train()
  }

  /**
   *
   */
  private fun train() {

    println("\n-- TRAINING")

    val optimizer = ParamsOptimizer(
      params = this.neuralNetwork.model,
      updateMethod = ADAMMethod(stepSize = 0.001, beta1 = 0.9, beta2 = 0.999))

    val trainingHelper = FeedforwardTrainingHelper(
      neuralProcessor = FeedforwardNeuralProcessor(this.neuralNetwork),
      optimizer = optimizer,
      lossCalculator = SoftmaxCrossEntropyCalculator(),
      verbose = true)

    val validationHelper = FeedforwardValidationHelper(
      neuralProcessor = FeedforwardNeuralProcessor(this.neuralNetwork),
      outputEvaluationFunction = ClassificationEvaluation())

    trainingHelper.train(
      trainingExamples = this.dataset.training,
      validationExamples = this.dataset.validation,
      epochs = 15,
      batchSize = 1,
      shuffler = Shuffler(enablePseudoRandom = true, seed = 1),
      validationHelper = validationHelper)
  }
}