def genBagOfWords(self):
        class_list,url_list = loadURLandClassID()
        word_vector_list = []
        common_word_keys = []

        for url in url_list:
            worddict = {}
            wordslist = japaneseTokenize(getURLText(url))
            for word in wordslist:
                if word in worddict:
                    worddict[word] += 1
                else:
                    worddict[word] = 1

            #Merge keys
            common_word_keys = list(set().union(common_word_keys, worddict.keys()))
            word_vector_list.append(worddict)

        #Rearrange word_vecotr_list with common_word_keys
        new_word_vector_list = []
        for word_vector in word_vector_list:
            new_word_vector = {}
            #Initialize word_vector. Use Common word keys as new_word_vector's keys
            new_word_vector = dict(zip(common_word_keys, [0] * len(common_word_keys)))

            #Update dict's value with word_vector's value
            new_word_vector.update(word_vector)
            new_word_vector_list.append(new_word_vector.values())

        bow["classes"] = class_list
        bow["datas"] = new_word_vector_list
        bow["data_labels"] = common_word_keys