Update dataset.py

        text = random.choice(self.lines)

        text = text.replace("[name]", self.placeholder_token)

        tags = filename_text.split(',')

        if shared.opt.tag_drop_out != 0:

        if shared.opts.tag_drop_out != 0:

            tags = [t for t in tags if random.random() > shared.opt.tag_drop_out]

        if shared.opts.shuffle_tags:

            random.shuffle(tags)