错误 NullPointer Neuroph doOneLearningIteration

Question

我正在使用 Neuroph 2.9 框架编写 ANN 代码来预测房价。我想每次运行每个时期都得到每个错误（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)

问题出在我使用时：learningRule.learn(TrainSet);没关系，没有错误出来。文档太糟糕了，无法根据不同的功能选择正确的功能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override或者运行1个epoch，然后doOneLearningIteration。这对我有用。

错误 NullPointer Neuroph doOneLearningIteration

Error NullPointer Neuroph doOneLearningIteration

java

backpropagation

neural-network