java - 错误空指针 Neuroph doOneLearningIteration

Question

我正在使用 Neuroph 2.9 框架编写 ANN 代码来预测房价。我希望每次运行每个纪元时都会出现每个错误(以在图表上显示错误的改进)，但这会导致错误。

// create multi layer perceptron
    System.out.println("Creating neural network");
    MultiLayerPerceptron neuralNet = new MultiLayerPerceptron(
            TransferFunctionType.SIGMOID, inputsCount, hiddentsCount1,
            outputsCount);

// set learning parameters
    MomentumBackpropagation learningRule = new MomentumBackpropagation();
    learningRule.setLearningRate(0.3);
    learningRule.setMomentum(0.5);
    learningRule.setNeuralNetwork(neuralNet);

    learningRule.setTrainingSet(TrainSet);
    learningRule.doOneLearningIteration(TrainSet);

我明白了:

Exception in thread "main" java.lang.NullPointerException
at org.neuroph.nnet.learning.MomentumBackpropagation.updateNeuronWeights(MomentumBackpropagation.java:72)
at org.neuroph.nnet.learning.BackPropagation.calculateErrorAndUpdateOutputNeurons(BackPropagation.java:83)
at org.neuroph.nnet.learning.BackPropagation.updateNetworkWeights(BackPropagation.java:53)
at org.neuroph.core.learning.SupervisedLearning.learnPattern(SupervisedLearning.java:190)
at org.neuroph.core.learning.SupervisedLearning.doLearningEpoch(SupervisedLearning.java:165)
at org.neuroph.core.learning.IterativeLearning.doOneLearningIteration(IterativeLearning.java:245)
at com.thao.Main.main(Main.java:76)

问题是当我使用:learningRule.learn(TrainSet);没关系，没有错误出来。文档太糟糕了，无法使用不同的函数来选择正确的函数来运行我想要的正确的东西。

Answer 1

我发现 doOneLearningIteration 函数不起作用，因为在它们内部。它没有启动。因此，要运行，我们需要重写或运行 1 epoch，然后执行 doOneLearningIteration。这对我来说是工作。