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java.lang.Objectopennlp.tools.parser.AbstractBottomUpParser
public abstract class AbstractBottomUpParser
Abstract class which contains code to tag and chunk parses for bottom up parsing and leaves implementation of advancing parses and completing parses to extend class.
Note:
The nodes within
the returned parses are shared with other parses and therefore their parent node references will not be consistent
with their child node reference. setParents
can be used to make the parents consistent
with a particular parse, but subsequent calls to setParents
can invalidate the results of earlier
calls.
Field Summary | |
---|---|
static java.lang.String |
COMPLETE
Outcome used when a constituent is complete. |
static java.lang.String |
CONT
Prefix for outcomes continuing a constituent. |
static double |
defaultAdvancePercentage
The default amount of probability mass required of advanced outcomes. |
static int |
defaultBeamSize
The default beam size used if no beam size is given. |
static java.lang.String |
INC_NODE
The label for the top if an incomplete node. |
static java.lang.String |
INCOMPLETE
Outcome used when a constituent is incomplete. |
static java.lang.String |
OTHER
Outcome for token which is not contained in a basal constituent. |
static java.lang.String |
START
Prefix for outcomes starting a constituent. |
static java.lang.String |
TOK_NODE
The label for a token node. |
static java.lang.String |
TOP_NODE
The label for the top node. |
static java.lang.Integer |
ZERO
The integer 0. |
Constructor Summary | |
---|---|
AbstractBottomUpParser(POSTagger tagger,
Chunker chunker,
HeadRules headRules,
int beamSize,
double advancePercentage)
|
Method Summary | |
---|---|
static Dictionary |
buildDictionary(ObjectStream<Parse> data,
HeadRules rules,
int cutoff)
Creates a n-gram dictionary from the specified data stream using the specified head rule and specified cut-off. |
static Parse[] |
collapsePunctuation(Parse[] chunks,
java.util.Set<java.lang.String> punctSet)
Removes the punctuation from the specified set of chunks, adds it to the parses adjacent to the punctuation is specified, and returns a new array of parses with the punctuation removed. |
Parse |
parse(Parse tokens)
Returns a parse for the specified parse of tokens. |
Parse[] |
parse(Parse tokens,
int numParses)
Returns the specified number of parses or fewer for the specified tokens. |
void |
setErrorReporting(boolean errorReporting)
Specifies whether the parser should report when it was unable to find a parse for a particular sentence. |
static void |
setParents(Parse p)
Assigns parent references for the specified parse so that they are consistent with the children references. |
Methods inherited from class java.lang.Object |
---|
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
---|
public static final int defaultBeamSize
public static final double defaultAdvancePercentage
public static final java.lang.String TOP_NODE
public static final java.lang.String INC_NODE
public static final java.lang.String TOK_NODE
public static final java.lang.Integer ZERO
public static final java.lang.String START
public static final java.lang.String CONT
public static final java.lang.String OTHER
public static final java.lang.String COMPLETE
public static final java.lang.String INCOMPLETE
Constructor Detail |
---|
public AbstractBottomUpParser(POSTagger tagger, Chunker chunker, HeadRules headRules, int beamSize, double advancePercentage)
Method Detail |
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public void setErrorReporting(boolean errorReporting)
errorReporting
- If true then un-parsed sentences are reported, false otherwise.public static void setParents(Parse p)
p
- The parse whose parent references need to be assigned.public static Parse[] collapsePunctuation(Parse[] chunks, java.util.Set<java.lang.String> punctSet)
chunks
- A set of parses.punctSet
- The set of punctuation which is to be removed.
public Parse[] parse(Parse tokens, int numParses)
Parser
setParents
can be used to make the parents consistent
with a particular parse, but subsequent calls to setParents
can invalidate the results of earlier
calls.
parse
in interface Parser
tokens
- A parse containing the tokens with a single parent node.numParses
- The number of parses desired.
public Parse parse(Parse tokens)
Parser
parse
in interface Parser
tokens
- The root node of a flat parse containing only tokens.
public static Dictionary buildDictionary(ObjectStream<Parse> data, HeadRules rules, int cutoff) throws java.io.IOException
data
- The data stream of parses.rules
- The head rules for the parses.cutoff
- The minimum number of entries required for the n-gram to be saved as part of the dictionary.
java.io.IOException
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