SVMLightRecordReader (deeplearning4j 1.0.0-beta7 API)

java.lang.Object
- org.datavec.api.records.reader.BaseRecordReader
- - org.datavec.api.records.reader.impl.LineRecordReader
  - - org.datavec.api.records.reader.impl.misc.SVMLightRecordReader

All Implemented Interfaces:

Closeable, Serializable, AutoCloseable, Configurable, RecordReader

Direct Known Subclasses:

LibSvmRecordReader
```
public class SVMLightRecordReader
extends LineRecordReader
```
Record reader for SVMLight format, which can generally be described as LABEL INDEX:VALUE INDEX:VALUE ... SVMLight format is well-suited to sparse data (e.g., bag-of-words) because it omits all features with value zero. We support an "extended" version that allows for multiple targets (or labels) separated by a comma, as follows: LABEL1,LABEL2,... INDEX:VALUE INDEX:VALUE ... This can be used to represent either multitask problems or multilabel problems with sparse binary labels (controlled via the "MULTILABEL" configuration option). Like scikit-learn, we support both zero-based and one-based indexing. Further details on the format can be found at
- http://svmlight.joachims.org/
- http://www.csie.ntu.edu.tw/~cjlin/libsvmtools/datasets/multilabel.html
- http://scikit-learn.org/stable/modules/generated/sklearn.datasets.load_svmlight_file.html

Author:

Adam Gibson (original), Josh Patterson, dave@skymind.io

See Also:

Serialized Form

Field Summary

Fields
Modifier and Type	Field and Description
`static String`	`ALLOWED_DELIMITERS`
`protected boolean`	`appendLabel`
`static String`	`COMMENT_CHAR`
`static String`	`FEATURE_DELIMITER`
`static String`	`LABEL_DELIMITER`
`static Writable`	`LABEL_ONE`
`static Writable`	`LABEL_ZERO`
`protected boolean`	`multilabel`
`static String`	`MULTILABEL`
`static String`	`NAME_SPACE`
`static String`	`NUM_ATTRIBUTES`
`static String`	`NUM_FEATURES`
`static String`	`NUM_LABELS`
`protected int`	`numFeatures`
`protected int`	`numLabels`
`static Writable`	`ONE`
`static String`	`PREFERRED_DELIMITER`
`static String`	`QID_PREFIX`
`protected Writable`	`recordLookahead`
`static Writable`	`ZERO`
`static String`	`ZERO_BASED_INDEXING`
`static String`	`ZERO_BASED_LABEL_INDEXING`
`protected boolean`	`zeroBasedIndexing`
`protected boolean`	`zeroBasedLabelIndexing`

Fields inherited from class org.datavec.api.records.reader.impl.LineRecordReader
charset, conf, initialized, lineIndex, locations, splitIndex

Fields inherited from class org.datavec.api.records.reader.BaseRecordReader
inputSplit, listeners, streamCreatorFn

Fields inherited from interface org.datavec.api.records.reader.RecordReader
APPEND_LABEL, LABELS

Constructor Summary

Constructors
Constructor and Description

SVMLightRecordReader()

Constructors
Constructor and Description
`SVMLightRecordReader()`

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`protected Writable`	`getNextRecord()` Helper function to help detect lines that are commented out.
`boolean`	`hasNext()` Whether there are anymore records
`void`	`initialize(Configuration conf, InputSplit split)` Must be called before attempting to read records.
`List<Writable>`	`next()` Return next record as list of Writables.
`Record`	`nextRecord()` Return next Record.
`protected void`	`onLocationOpen(URI location)`
`List<Writable>`	`record(URI uri, DataInputStream dataInputStream)` Load the record from the given DataInputStream Unlike `RecordReader.next()` the internal state of the RecordReader is not modified Implementations of this method should not close the DataInputStream
`void`	`reset()` Reset record reader iterator
`void`	`setConf(Configuration conf)` Set configuration.

Methods inherited from class org.datavec.api.records.reader.impl.LineRecordReader
close, closeIfRequired, getConf, getIterator, getLabels, initialize, loadFromMetaData, loadFromMetaData, resetSupported

Methods inherited from class org.datavec.api.records.reader.BaseRecordReader
batchesSupported, getListeners, invokeListeners, next, setListeners, setListeners

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - NAME_SPACE
```
public static final String NAME_SPACE
```
  - NUM_FEATURES
```
public static final String NUM_FEATURES
```
  - ZERO_BASED_INDEXING
```
public static final String ZERO_BASED_INDEXING
```
  - ZERO_BASED_LABEL_INDEXING
```
public static final String ZERO_BASED_LABEL_INDEXING
```
  - MULTILABEL
```
public static final String MULTILABEL
```
  - NUM_LABELS
```
public static final String NUM_LABELS
```
  - COMMENT_CHAR
```
public static final String COMMENT_CHAR
```
    See Also:
    
    Constant Field Values
  - ALLOWED_DELIMITERS
```
public static final String ALLOWED_DELIMITERS
```
    See Also:
    
    Constant Field Values
  - PREFERRED_DELIMITER
```
public static final String PREFERRED_DELIMITER
```
    See Also:
    
    Constant Field Values
  - FEATURE_DELIMITER
```
public static final String FEATURE_DELIMITER
```
    See Also:
    
    Constant Field Values
  - LABEL_DELIMITER
```
public static final String LABEL_DELIMITER
```
    See Also:
    
    Constant Field Values
  - QID_PREFIX
```
public static final String QID_PREFIX
```
    See Also:
    
    Constant Field Values
  - ZERO
```
public static final Writable ZERO
```
  - ONE
```
public static final Writable ONE
```
  - LABEL_ZERO
```
public static final Writable LABEL_ZERO
```
  - LABEL_ONE
```
public static final Writable LABEL_ONE
```
  - numFeatures
```
protected int numFeatures
```
  - zeroBasedIndexing
```
protected boolean zeroBasedIndexing
```
  - zeroBasedLabelIndexing
```
protected boolean zeroBasedLabelIndexing
```
  - appendLabel
```
protected boolean appendLabel
```
  - multilabel
```
protected boolean multilabel
```
  - numLabels
```
protected int numLabels
```
  - recordLookahead
```
protected Writable recordLookahead
```
  - NUM_ATTRIBUTES
```
public static final String NUM_ATTRIBUTES
```
- Constructor Detail
  - SVMLightRecordReader
```
public SVMLightRecordReader()
```
- Method Detail
  - initialize
```
public void initialize(Configuration conf,
                       InputSplit split)
                throws IOException,
                       InterruptedException
```
    Must be called before attempting to read records.
    
    Specified by:
    
    initialize in interface RecordReader
    
    Overrides:
    
    initialize in class LineRecordReader
    
    Parameters:
    
    conf - DataVec configuration
    
    split - FileSplit
    
    Throws:
    
    IOException
    
    InterruptedException
  - setConf
```
public void setConf(Configuration conf)
```
    Set configuration.
    
    Specified by:
    
    setConf in interface Configurable
    
    Overrides:
    
    setConf in class LineRecordReader
    
    Parameters:
    
    conf - DataVec configuration
    
    Throws:
    
    IOException
    
    InterruptedException
  - getNextRecord
```
protected Writable getNextRecord()
```
    Helper function to help detect lines that are commented out. May read ahead and cache a line.
    
    Returns:
  - hasNext
```
public boolean hasNext()
```
    Description copied from interface: RecordReader
    
    Whether there are anymore records
    
    Specified by:
    
    hasNext in interface RecordReader
    
    Overrides:
    
    hasNext in class LineRecordReader
    
    Returns:
  - next
```
public List<Writable> next()
```
    Return next record as list of Writables.
    
    Specified by:
    
    next in interface RecordReader
    
    Overrides:
    
    next in class LineRecordReader
    
    Returns:
  - nextRecord
```
public Record nextRecord()
```
    Return next Record.
    
    Specified by:
    
    nextRecord in interface RecordReader
    
    Overrides:
    
    nextRecord in class LineRecordReader
    
    Returns:
  - record
```
public List<Writable> record(URI uri,
                             DataInputStream dataInputStream)
                      throws IOException
```
    Description copied from interface: RecordReader
    
    Load the record from the given DataInputStream Unlike RecordReader.next() the internal state of the RecordReader is not modified Implementations of this method should not close the DataInputStream
    
    Specified by:
    
    record in interface RecordReader
    
    Overrides:
    
    record in class LineRecordReader
    
    Throws:
    
    IOException - if error occurs during reading from the input stream
  - reset
```
public void reset()
```
    Description copied from interface: RecordReader
    
    Reset record reader iterator
    
    Specified by:
    
    reset in interface RecordReader
    
    Overrides:
    
    reset in class LineRecordReader
  - onLocationOpen
```
protected void onLocationOpen(URI location)
```
    Overrides:
    
    onLocationOpen in class LineRecordReader

Class SVMLightRecordReader

Field Summary

Fields inherited from class org.datavec.api.records.reader.impl.LineRecordReader

Fields inherited from class org.datavec.api.records.reader.BaseRecordReader

Fields inherited from interface org.datavec.api.records.reader.RecordReader

Constructor Summary

Method Summary

Methods inherited from class org.datavec.api.records.reader.impl.LineRecordReader

Methods inherited from class org.datavec.api.records.reader.BaseRecordReader

Methods inherited from class java.lang.Object

Field Detail

NAME_SPACE

NUM_FEATURES

ZERO_BASED_INDEXING

ZERO_BASED_LABEL_INDEXING

MULTILABEL

NUM_LABELS

COMMENT_CHAR

ALLOWED_DELIMITERS

PREFERRED_DELIMITER

FEATURE_DELIMITER

LABEL_DELIMITER

QID_PREFIX

ZERO

ONE

LABEL_ZERO

LABEL_ONE

numFeatures

zeroBasedIndexing

zeroBasedLabelIndexing

appendLabel

multilabel

numLabels

recordLookahead

NUM_ATTRIBUTES

Constructor Detail

SVMLightRecordReader

Method Detail

initialize

setConf

getNextRecord

hasNext

next

nextRecord

record

reset

onLocationOpen