code: public static ParameterTool fromMap(Map<String, String> map) {
  		Preconditions.checkNotNull(map, "Unable to initialize from empty map");
  		return new ParameterTool(map);
  	}
docs: Returns {@link ParameterTool} for the given map.
  
  @param map A map of arguments. Both Key and Value have to be Strings
  @return A {@link ParameterTool}