docs: public GraphAlgorithmWrappingBase<K, VV, EV, R> setParallelism(int parallelism) {
  		Preconditions.checkArgument(parallelism > 0 || parallelism == PARALLELISM_DEFAULT,
  				"The parallelism must be at least one, or ExecutionConfig.PARALLELISM_DEFAULT (use system default).");
  
  		this.parallelism = parallelism;
  
  		return this;
  	}