Package com.yahoo.labs.samoa.instances

Class ArffLoader

java.lang.Object

com.yahoo.labs.samoa.instances.ArffLoader

Direct Known Subclasses:

MultiTargetArffLoader

public class ArffLoader
extends java.lang.Object

The Class ArffLoader. Loads an Arff file with sparse or dense format.

Field Summary

Fields

Modifier and Type	Field	Description
protected java.util.List<Attribute>	auxAttributes
protected InstanceInformation	instanceInformation	The instance information.
protected Range	range
protected InstancesHeader	streamHeader
protected java.io.StreamTokenizer	streamTokenizer	The stream tokenizer.

Constructor Summary

Constructors

Constructor	Description
ArffLoader(java.io.Reader reader)	Instantiates a new arff loader.
ArffLoader(java.io.Reader reader, int size, int classAttribute)	Instantiates a new arff loader.
ArffLoader(java.io.Reader reader, Range range)	Instantiates a new arff loader.

Method Summary

Modifier and Type	Method	Description
InstanceInformation	getStructure()	Gets the structure.
protected Instance	newDenseInstance(int numberAttributes)
protected Instance	newSparseInstance(double d)
protected Instance	newSparseInstance(double d, double[] res)
Instance	readInstance()	Reads instance.
Instance	readInstanceDense()	Reads a dense instance from the file.
protected void	setValue(Instance instance, int numAttribute, double value, boolean isNumber)

Methods inherited from class java.lang.Object

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

Field Detail

instanceInformation

protected InstanceInformation instanceInformation

The instance information.

streamHeader

protected InstancesHeader streamHeader

streamTokenizer

protected java.io.StreamTokenizer streamTokenizer

The stream tokenizer.

range

protected Range range

auxAttributes

protected java.util.List<Attribute> auxAttributes

Constructor Detail

ArffLoader

public ArffLoader(java.io.Reader reader,
                  int size,
                  int classAttribute)

Instantiates a new arff loader.

Parameters:

reader - the reader

size - the size

classAttribute - the class attribute

ArffLoader

public ArffLoader(java.io.Reader reader)

Instantiates a new arff loader.

Parameters:

reader - the reader

range -

size - the size

classAttribute - the class attribute

ArffLoader

public ArffLoader(java.io.Reader reader,
                  Range range)

Instantiates a new arff loader.

Parameters:

reader - the reader

range -

size - the size

classAttribute - the class attribute

Method Detail

getStructure

public InstanceInformation getStructure()

Gets the structure.

Returns:

the structure

readInstance

public Instance readInstance()

Reads instance. It detects if it is dense or sparse.

Returns:

the instance

readInstanceDense

public Instance readInstanceDense()

Reads a dense instance from the file.

Returns:

the instance

setValue

protected void setValue(Instance instance,
                        int numAttribute,
                        double value,
                        boolean isNumber)

newSparseInstance

protected Instance newSparseInstance(double d,
                                     double[] res)

newSparseInstance

protected Instance newSparseInstance(double d)

newDenseInstance

protected Instance newDenseInstance(int numberAttributes)