Example usage for weka.distributed CSVToARFFHeaderMapTask makeInstance

Introduction

In this page you can find the example usage for weka.distributed CSVToARFFHeaderMapTask makeInstance.

Prototype

public Instance makeInstance(Instances trainingHeader, boolean setStringValues, String[] parsed)
        throws Exception 

Source Link

Document

Utility method for Constructing a dense instance given an array of parsed CSV values

Usage

From source file:distributed.core.DistributedJob.java

License:Open Source License

/**
 * Utility method to parse an Instance out of a row of CSV data.
 *
 * @param row the row of data to convert to an Instance
 * @param rowHelper the CSVToARFFHeaderMap task to use for parsing purposes
 * @param headerNoSummary the header of the data (sans summary attributes)
 *          that contains attribute information for the instance
 * @param setStringVals true if the values of string attributes are to be set
 *          on the header (rather than accumulate in the header).
 * @return an Instance//from   ww w. jav  a  2s.c om
 * @throws IOException if a problem occurs
 */
public static Instance parseInstance(String row, CSVToARFFHeaderMapTask rowHelper, Instances headerNoSummary,
        boolean setStringVals) throws IOException {
    Instance result = null;

    String[] parsed = rowHelper.parseRowOnly(row);
    if (parsed.length != headerNoSummary.numAttributes()) {
        throw new IOException("Parsed a row that contains a different number of values than "
                + "there are attributes in the training ARFF header: " + row);
    }

    try {
        result = rowHelper.makeInstance(headerNoSummary, setStringVals, parsed);
    } catch (Exception ex) {
        throw new IOException(ex);
    }

    return result;
}

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