org.apache.ctakes.ytex.uima.annotators

Class NegexAnnotator

java.lang.Object

org.apache.uima.analysis_component.AnalysisComponent_ImplBase

org.apache.uima.analysis_component.Annotator_ImplBase

org.apache.uima.analysis_component.JCasAnnotator_ImplBase

org.apache.ctakes.ytex.uima.annotators.NegexAnnotator

All Implemented Interfaces:

org.apache.uima.analysis_component.AnalysisComponent

@PipeBitInfo(name="Negation Annotator (Negex)",
             description="Use negex to assign polarity to Named Entities.",
             dependencies={SENTENCE,IDENTIFIED_ANNOTATION})
public class NegexAnnotator
extends org.apache.uima.analysis_component.JCasAnnotator_ImplBase

Negex adapted to cTAKES. Checks negation status of named entities. Loads negex triggers from classpath: /org/apache/ctakes/ytex/uima/annotators/negex_triggers.txt

The meaning of the certainty and confidence attributes is nowhere documented for cTakes. There are several ways of handling 'maybes', see below. Default behavior: certainty attribute for negated & possible terms set to -1 Configure with following uima initialization parameters:

checkPossibilities : should we check for possibilities negatePossibilities : should possibilities be negated, default = true? if true,

• negated: polarity=-1, confidence=1
• possible: polarity=-1, confidence=-1
• affirmed: polarity=1, confidence=1

negated: polarity=-1, confidence=1 possible: polarity=1, confidence=-1 affirmed: polarity=1, confidence=1

storeAsInterval

• negated: polarity=-1, confidence = -1
• possible: polarity=1, confidence = 0.5
• affirmed: polarity=1, confidence = 1

Added support for negating arbitrary annotations. Set the targetTypeName to an annotation type. Will see if it is negated; if so will set the negated and possible boolean values on the annotation.

Author:

vijay