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.

Constructor Summary

Constructors
Modifier Constructor Description

private DocToDoubleVectorUtils()

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method	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

- Constructor Detail
  - DocToDoubleVectorUtils
```
private DocToDoubleVectorUtils()
```
- 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