question: public Enumeration < Option > listOptions ( ) { Vector < Option > newVector = new Vector < Option > ( 2 ) ; newVector . addElement ( new Option ( "\tNumber of folds used for cross validation (default 10)." , "X" , 1 , "-X <number of folds>" ) ) ; newVector . addElement ( new Option ( "\tClassifier parameter options.\n" + "\teg: \"N 1 5 10\" Sets an optimisation parameter for the\n" + "\tclassifier with name -N, with lower bound 1, upper bound\n" + "\t5, and 10 optimisation steps. The upper bound may be the\n" + "\tcharacter 'A' or 'I' to substitute the number of\n" + "\tattributes or instances in the training data,\n" + "\trespectively. This parameter may be supplied more than\n" + "\tonce to optimise over several classifier options\n" + "\tsimultaneously." , "P" , 1 , "-P <classifier parameter>" ) ) ; newVector . addAll ( Collections . list ( super . listOptions ( ) ) ) ; return newVector . elements ( ) ; }
target:  Returns an enumeration describing the available options.