code: public double nonNormalizedTreeDist(LblTree t1, LblTree t2) {
  		init(t1, t2);
  		STR = new int[size1][size2];
  		computeOptimalStrategy();
  		return computeDistUsingStrArray(it1, it2);
  	}
docs: Computes the tree edit distance between trees t1 and t2.
  
  @param t1
  @param t2
  @return tree edit distance between trees t1 and t2