public Map<String, FieldValueRecommender> createDefaultParametersToOptimize() {
Map<String, FieldValueRecommender> parametersToOptimize = Maps.newHashMap();
parametersToOptimize.putAll(wrappedBuilderBuilder.createDefaultParametersToOptimize());
parametersToOptimize.put(HALF_LIFE_OF_NEGATIVE, new FixedOrderRecommender(1.0, 7.0, 30.0));
parametersToOptimize.put(HALF_LIFE_OF_POSITIVE, new FixedOrderRecommender(1.0, 7.0, 30.0));
parametersToOptimize.put(DATE_EXTRACTOR, new FixedOrderRecommender(new SimpleDateFormatExtractor()));
return parametersToOptimize;
}