java - 如何在数据集中存储 INDArray 的列表

Question

对于强化学习，我创建了两个List<INDArray>状态以及相应的移动预测和奖励值。我怎样才能将这两个Lists 变成一个org.nd4j.linalg.dataset.api.DataSet

Answer 1

大多数方法也接受 org.nd4j.linalg.dataset.api.iterator.DataSetIterator，而不仅仅是 org.nd4j.linalg.dataset.DataSet。所以你可以使用这个代码：

import java.util.ArrayList;
import java.util.List;

import org.nd4j.linalg.dataset.DataSet;
import org.nd4j.linalg.dataset.api.DataSetPreProcessor;
import org.nd4j.linalg.dataset.api.iterator.DataSetIterator;


public class DataSetIteratorImpl implements DataSetIterator {
    
    
    private static final long serialVersionUID = -3010080072504907088L;
    
    
    private List<DataSet> entries;
    private int current = 0;
    private DataSetPreProcessor dataSetPreProcessor;
    
    
    public DataSetIteratorImpl() {
        entries = new ArrayList<DataSet>();
        reset();
    }
    
    
    public void addEntry(DataSet entry) {
        entries.add(entry);
    }
    
    
    @Override
    public boolean hasNext() {
        return current < entries.size();
    }

    @Override
    public DataSet next() {
        return entries.get(current++);
    }

    @Override
    public boolean asyncSupported() {
        return false;
    }

    @Override
    public int batch() {
        return entries.size();
    }

    @Override
    public DataSetPreProcessor getPreProcessor() {
        return dataSetPreProcessor;
    }

    @Override
    public void reset() {
        current = 0;
    }

    @Override
    public boolean resetSupported() {
        return true;
    }

    @Override
    public void setPreProcessor(DataSetPreProcessor _dataSetPreProcessor) {
        dataSetPreProcessor = _dataSetPreProcessor;
    }
    
    @Override
    public int inputColumns() {
        throw new UnsupportedOperationException();
    }

    @Override
    public DataSet next(int arg0) {
        throw new UnsupportedOperationException();
    }
    
    @Override
    public List<String> getLabels() {
        throw new UnsupportedOperationException();
    }
    
    @Override
    public int totalOutcomes() {
        throw new UnsupportedOperationException();
    }


    @Override
    public void remove() {
        throw new UnsupportedOperationException();
    }
}

您可以使用以下代码创建迭代器：

DataSetIterator iterator = new DataSetIteratorImpl ();

然后当你填充迭代器时，只需调用几次：

iterator.addEntry(new DataSet(INDArrayinput, INDArrayoutput));

之后，迭代器就可以用作训练集了。