types
Class Alphabet

java.lang.Object
  types.Alphabet

All Implemented Interfaces:

Serializable

public class Alphabet
extends Object
implements Serializable

This class is used to map from some descriptive features (e.g. words in text) to an index in an array.

Author:

kuzman

See Also:

Serialized Form

Constructor Summary

Alphabet()

Method Summary

Object	lookupIndex(int ind)
String	lookupInt(int key) returns the string representation of feature associated with a index.
int	lookupObject(Object feature) returns the index associated with a feature.
int	size()
void	startGrowth()
void	stopGrowth() at test time, we need to stop the growth of the alphabet so we do not increase the size of the feature vector in case the user tries to use features not encountered at training time.

Methods inherited from class java.lang.Object

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

Constructor Detail

Alphabet

public Alphabet()

Method Detail

lookupObject

public int lookupObject(Object feature)

returns the index associated with a feature. This should be the same for all features a,b where a.equals(b).

Parameters:

feature -

Returns:

the index corresponding to the feature

lookupIndex

public Object lookupIndex(int ind)

stopGrowth

public void stopGrowth()

at test time, we need to stop the growth of the alphabet so we do not increase the size of the feature vector in case the user tries to use features not encountered at training time.

startGrowth

public void startGrowth()

size

public int size()

lookupInt

public String lookupInt(int key)

returns the string representation of feature associated with a index. This should be the same for all features a,b where a.equals(b).

Parameters:

index - of feature

Returns:

the String representation of a feature