org.apache.lucene.classification.utils

Class DocToDoubleVectorUtils

java.lang.Object

org.apache.lucene.classification.utils.DocToDoubleVectorUtils

public class DocToDoubleVectorUtils
extends java.lang.Object

utility class for converting Lucene Documents to Double vectors.

Method Summary

Modifier and Type	Method and Description
static java.lang.Double[]	toDenseLocalFreqDoubleArray(Terms docTerms) create a dense Double vector given doc and field term vectors using local frequency of the terms in the doc
static java.lang.Double[]	toSparseLocalFreqDoubleArray(Terms docTerms, Terms fieldTerms) create a sparse Double vector given doc and field term vectors using local frequency of the terms in the doc

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

toSparseLocalFreqDoubleArray

public static java.lang.Double[] toSparseLocalFreqDoubleArray(Terms docTerms,
                                                              Terms fieldTerms)
                                                       throws java.io.IOException

create a sparse Double vector given doc and field term vectors using local frequency of the terms in the doc

Parameters:

docTerms - term vectors for a given document

fieldTerms - field term vectors

Returns:

a sparse vector of Doubles as an array

Throws:

java.io.IOException - in case accessing the underlying index fails

toDenseLocalFreqDoubleArray

public static java.lang.Double[] toDenseLocalFreqDoubleArray(Terms docTerms)
                                                      throws java.io.IOException

create a dense Double vector given doc and field term vectors using local frequency of the terms in the doc

Parameters:

docTerms - term vectors for a given document

Returns:

a dense vector of Doubles as an array

Throws:

java.io.IOException - in case accessing the underlying index fails