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LVG tools is used by Apache cTAKES.

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Provides the classes necessary to generate inflections, uninflections, and
derivations using LVG rules tries.  This package provides a persistent data storing and retrieving mechanism for the application of LVG rules.  The original design concept is from previous version of LVG.

Features
Features of this package are described as follows:

Stores Lvg rule information in files instead of RAM.
Provides random access ability for quick retrieval.


Usage

Inflection & Uninflection:
	
	Initiate a persistent trie object
	
PersistentTrie trie = new PersistentTrie(true);
	
Retrieve inflections for a String str
	
Vector inflections = trie.GetInflectedTermsByRules(inStr, true);
	
Retrieve uninflections for a String str
	
Vector uninflections = trie.GetUninflectedTermsByRules(inStr, true);
	
Close the trie
	
trie.Close();
	
Derivation:
	
	Initiate a persistent trie object
	
PersistentTrie trie = new PersistentTrie(false);
	
Retrieve derivations for a String str
	
Vector derivations = trie.GetDerivationsByRules(inStr, true);
	
Close the trie
	
trie.Close();
	


Files

The flat file for these LVG rules are under $LVG_DIR/data/rules/. They are:

 im.rul: rules of inflections and uninflections
 plural.rul: rules of plural, used by im.rul
 verbinfl.rul: rules of verb inflections, used by im.rul
 dm.rul: rules of derivations



The above files are read in by LVG trie pre-process programs and then stored as binary files for LVG trie system to retrieve later.  These binary files are
generated before LVG is distributed and are listed as follows:

trieI.data: data for trie tree of inflection
ruleI.data: data of inflection rules
exceptionI.data: data of exceptions on inflection rules



trieD.data: data for trie tree of derivation rules
ruleD.data: data of derivation rules
exceptionD.data: data of exceptions on derivation rules


Related Documents

Design Document


@since 2002