edu.illinois.cs.cogcomp.edison.utilities

Class POSBaseLineCounter

java.lang.Object

edu.illinois.cs.cogcomp.edison.utilities.POSBaseLineCounter

Direct Known Subclasses:

POSMikheevCounter

public class POSBaseLineCounter
extends Object

A baseline counter simply builds a table by counting the number of times that each form-POS association appear in a source corpus. Given a form, if it is observed, the counter will return the most frequent tag associated with the form.

Author:

Xinbo Wu

Field Summary

Fields

Modifier and Type	Field and Description
protected String	corpusName The name of corpus used for source
protected HashMap<String,TreeMap<String,Integer>>	table This map associates forms with maps that associate POS tags with counts.

Constructor Summary

Constructors

Constructor and Description
POSBaseLineCounter(String corpusName)

Method Summary

Modifier and Type	Method and Description
Set<String>	allowableTags(String form) Returns the set of tags that the given form has been observed with.
void	buildTable(String home) A table is built from either a given source corpus file or source corpus directory by simply counting the number of times that each form-POS association appear in a source corpus.
void	count(String form, String tag) Increment the counting of a given form-POS association
void	forget() Clears out the table to start fresh.
String	getCorpusName() Return the name of the source corpus.
boolean	looksLikeNumber(String form) Determines if the input form looks like a number of some sort.
boolean	observed(String form) Indicates whether the input form was observed while source this learner.
int	observedCount(String form) Returns the number of times the given form has been observed.
static POSBaseLineCounter	read(String json) Read the an instance of POSBaseLineCounter class from JSON format
String	tag(int tokenId, TextAnnotation ta) Give a tag for a given form
static String	write(POSBaseLineCounter counter) Write an instance of POSBaseLineCounter class to JSON format

Methods inherited from class java.lang.Object

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

Field Detail

table

protected HashMap<String,TreeMap<String,Integer>> table

This map associates forms with maps that associate POS tags with counts.

corpusName

protected final String corpusName

The name of corpus used for source

Constructor Detail

POSBaseLineCounter

public POSBaseLineCounter(String corpusName)

Method Detail

buildTable

public void buildTable(String home)
                throws Exception

A table is built from either a given source corpus file or source corpus directory by simply counting the number of times that each form-POS association appear in a source corpus.

Parameters:

home - file name or directory name of the source corpus

Throws:

Exception

count

public void count(String form,
                  String tag)

Increment the counting of a given form-POS association

forget

public void forget()

Clears out the table to start fresh.

tag

public String tag(int tokenId,
                  TextAnnotation ta)

Give a tag for a given form

looksLikeNumber

public boolean looksLikeNumber(String form)

Determines if the input form looks like a number of some sort.

Parameters:

form - The form of the form.

Returns:

true iff the form contains only characters in ".,-" and at least one digit.

observed

public boolean observed(String form)

Indicates whether the input form was observed while source this learner.

Parameters:

form - The form of the form.

Returns:

true if this learner contains statistics for the input form.

observedCount

public int observedCount(String form)

Returns the number of times the given form has been observed.

allowableTags

public Set<String> allowableTags(String form)

Returns the set of tags that the given form has been observed with.

Parameters:

form - The form of the form.

Returns:

The set of tags observed in association with the given form.

getCorpusName

public String getCorpusName()

Return the name of the source corpus.

write

public static String write(POSBaseLineCounter counter)

Write an instance of POSBaseLineCounter class to JSON format

read

public static POSBaseLineCounter read(String json)

Read the an instance of POSBaseLineCounter class from JSON format