remove unused code

src/com/rxnlp/tools/rouge/ROUGECalculator.java

@@ -613,7 +613,7 @@ private void computePrecisionRecall(Result r, String ngram, double overlap, Coll
 	}
 
 	private void computeROUGEL(Result r, List<String> refSents, List<String> sysSents) {
-		double comparisons = 0;
+
 		Set<String> unionLCSWords = new HashSet<>();
 		Set<String> allRefWords = new HashSet<>();
 		Set<String> allSysWords = new HashSet<>();