def get_next_line(self):
        """ Gets next line of random_file and starts over when reaching end of file"""
        try:
            line = next(self.random_file).strip()
            #keep track of which document we are currently looking at to later avoid having the same doc as t1
            if line == "":
                self.current_random_doc = self.current_random_doc + 1
                line = next(self.random_file).strip()
        except StopIteration:
            self.random_file.close()
            self.random_file = open(self.corpus_path, "r", encoding=self.encoding)
            line = next(self.random_file).strip()
        return line