code: public static int[] getDefaultWeights(String... sets) {
  		int[] weights = new int[sets.length];
  		for (int i = 0; i < sets.length; i++) {
  			weights[i] = 1;
  		}
  		return weights;
  	}
docs: 返回WEIGHTS选项的默认值.
  
  @param sets
  @return