options.addOption('c', "corpusDir", "the directory of the corpus",
true, "DIR", "Required");
options.addOption('a', "analogyFile",
"the file containing list of word pairs",
true, "FILE", "Required");
options.addOption('t', "testAnalogies",
"the file containing list of analogies",
true, "FILE", "Required");
options.addOption('o', "outputFile",
"the file containing the cosine similarity output " +
"for the analogies from testAnalogies",