if(this.entityFeatureExtractors == null){
this.entityFeatureExtractors = new ArrayList<SimpleFeatureExtractor>();
}
this.entityFeatureExtractors.add(new NegationDependencyFeatureExtractor());
this.entityFeatureExtractors.add(new ContextWordWindowExtractor("org/apache/ctakes/assertion/models/polarity.txt"));
this.entityFeatureExtractors.add(new AboveLeftFragmentExtractor("AL_Polarity","org/apache/ctakes/assertion/models/sharpPolarityFrags.txt"));
// this.entityFeatureExtractors.add(new AboveRightFragmentExtractor("AR_Polarity","org/apache/ctakes/assertion/models/sharpArPolarityFrags.txt"));
initializeDomainAdaptation();