Package opennlp.tools.parser.treeinsert

Class Parser

java.lang.Object

opennlp.tools.parser.AbstractBottomUpParser

opennlp.tools.parser.treeinsert.Parser

All Implemented Interfaces:

Parser

public class Parser
extends AbstractBottomUpParser

A built-attach Parser implementation.

Nodes are built when their left-most child is encountered. Subsequent children are attached as daughters. Attachment is based on node in the right-frontier of the tree. After each attachment or building, nodes are assessed as either complete or incomplete. Complete nodes are no longer eligible for daughter attachment.

Complex modifiers which produce additional node levels of the same type are attached with sister-adjunction. Attachment can not take place higher in the right-frontier than an incomplete node.

See Also:

• AbstractBottomUpParser
• Parser

Field Summary

Fields

Modifier and Type	Field	Description
static final String	ATTACH_DAUGHTER	Outcome used when a node should be attached as a daughter to another node.
static final String	ATTACH_SISTER	Outcome used when a node should be attached as a sister to another node.
static final String	BUILT	Label used to distinguish build nodes from non-built nodes.
static final String	DONE	Outcome used when a constituent needs an no additional parent node/building.
static final String	NON_ATTACH	Outcome used when a node should not be attached to another node.

Fields inherited from class opennlp.tools.parser.AbstractBottomUpParser

COMPLETE, CONT, defaultAdvancePercentage, defaultBeamSize, INC_NODE, INCOMPLETE, OTHER, START, TOK_NODE, TOP_NODE

Constructor Summary

Constructors

Constructor	Description
Parser(ParserModel model)	Instantiates a Parser via a given model.
Parser(ParserModel model, int beamSize, double advancePercentage)	Instantiates a Parser via a given model and other configuration parameters.

Method Summary

Modifier and Type	Method	Description
static List<Parse>	getRightFrontier(Parse root, Set<String> punctSet)	Returns the right frontier of the specified tree with nodes ordered from deepest to shallowest.
static ParserModel	train(String languageCode, ObjectStream<Parse> parseSamples, HeadRules rules, int iterations, int cutoff)	Starts a training of a ParserModel.
static ParserModel	train(String languageCode, ObjectStream<Parse> parseSamples, HeadRules rules, TrainingParameters mlParams)	Starts a training of a ParserModel.

Methods inherited from class opennlp.tools.parser.AbstractBottomUpParser

buildDictionary, buildDictionary, collapsePunctuation, parse, parse, setErrorReporting, setParents

Methods inherited from class java.lang.Object

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

Field Details

DONE

public static final String DONE

Outcome used when a constituent needs an no additional parent node/building.

See Also:

• Constant Field Values

ATTACH_SISTER

public static final String ATTACH_SISTER

Outcome used when a node should be attached as a sister to another node.

See Also:

• Constant Field Values

ATTACH_DAUGHTER

public static final String ATTACH_DAUGHTER

Outcome used when a node should be attached as a daughter to another node.

See Also:

• Constant Field Values

NON_ATTACH

public static final String NON_ATTACH

Outcome used when a node should not be attached to another node.

See Also:

• Constant Field Values

BUILT

public static final String BUILT

Label used to distinguish build nodes from non-built nodes.

See Also:

• Constant Field Values

Constructor Details

Parser

public Parser(ParserModel model,
 int beamSize,
 double advancePercentage)

Instantiates a Parser via a given model and other configuration parameters. Uses the default implementations of POSTaggerME and ChunkerME.

Parameters:

model - The ParserModel to use.

beamSize - The number of different parses kept during parsing.

advancePercentage - The minimal amount of probability mass which advanced outcomes must represent. Only outcomes which contribute to the top advancePercentage will be explored.

Throws:

IllegalStateException - Thrown if the ParserType is not supported.

See Also:

• ParserModel
• POSTaggerME
• ChunkerME

Parser

public Parser(ParserModel model)

Instantiates a Parser via a given model. Uses the default implementations of POSTaggerME and ChunkerME and default values for beamSize and advancePercentage.

Parameters:

model - The ParserModel to use.

Throws:

IllegalStateException - Thrown if the ParserType is not supported.

See Also:

• ParserModel
• POSTaggerME
• ChunkerME

Method Details

getRightFrontier

public static List<Parse> getRightFrontier(Parse root,
 Set<String> punctSet)

Returns the right frontier of the specified tree with nodes ordered from deepest to shallowest.

Parameters:

root - The root of the parse tree.

punctSet - A set of punctuation symbols to be used.

Returns:

The right frontier of the specified parse tree.

train

public static ParserModel train(String languageCode,
 ObjectStream<Parse> parseSamples,
 HeadRules rules,
 TrainingParameters mlParams)
                         throws IOException

Starts a training of a ParserModel.

Parameters:

languageCode - An ISO conform language code.

parseSamples - The samples as input.

rules - The HeadRules to use.

mlParams - The parameters for training.

Returns:

A valid ParserModel.

Throws:

IOException - Thrown if IO errors occurred during training.

train

public static ParserModel train(String languageCode,
 ObjectStream<Parse> parseSamples,
 HeadRules rules,
 int iterations,
 int cutoff)
                         throws IOException

Starts a training of a ParserModel.

Parameters:

languageCode - An ISO conform language code.

parseSamples - The samples as input.

rules - The HeadRules to use.

iterations - The number of iterations to be conducted.

cutoff - The cut-off parameter to be used.

Returns:

A valid ParserModel.

Throws:

IOException - Thrown if IO errors occurred during training.