Example usage for weka.classifiers.timeseries AbstractForecaster primeForecaster

Introduction

In this page you can find the example usage for weka.classifiers.timeseries AbstractForecaster primeForecaster.

Prototype

public abstract void primeForecaster(Instances insts) throws Exception;

Source Link

Document

Supply the (potentially) trained model with enough historical data, up to and including the current time point, in order to produce a forecast.

Usage

From source file:adams.flow.transformer.WekaPrimeForecaster.java

License:Open Source License

/**
 * Executes the flow item.//from  www .ja  va 2s. c  om
 *
 * @return      null if everything is fine, otherwise error message
 */
@Override
protected String doExecute() {
    String result;
    Instances data;
    Instance inst;
    AbstractForecaster cls;

    result = null;

    try {
        cls = getForecasterInstance();
        if (cls == null)
            result = "Failed to obtain forecaster!";

        if (result == null) {
            if ((m_InputToken != null) && (m_InputToken.getPayload() instanceof Instances)) {
                data = (Instances) m_InputToken.getPayload();
                cls.primeForecaster(data);
                m_OutputToken = new Token(new WekaModelContainer(cls, new Instances(data, 0), data));
            } else if ((m_InputToken != null) && (m_InputToken.getPayload() instanceof Instance)) {
                inst = (Instance) m_InputToken.getPayload();
                data = inst.dataset();
                if (cls instanceof IncrementallyPrimeable) {
                    ((IncrementallyPrimeable) cls).primeForecasterIncremental(inst);
                    m_OutputToken = new Token(new WekaModelContainer(cls, new Instances(data, 0), data));
                } else {
                    result = m_Forecaster.getValue() + " (= " + cls.getClass().getName()
                            + ") does not implement " + IncrementallyPrimeable.class.getName()
                            + "! Cannot prime incrementally!";
                }
            }
        }
    } catch (Exception e) {
        m_OutputToken = null;
        result = handleException("Failed to process data:", e);
    }

    if (m_OutputToken != null)
        updateProvenance(m_OutputToken);

    return result;
}

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