keras.reuters.datasets中有标签字典吗？

from keras.datasets import reuters
from keras.utils import get_file
import numpy as np

path = get_file('reuters.npz', origin='https://s3.amazonaws.com/text-datasets/reuters.npz')
with np.load(path) as f:
    x_train, y_train = f['x_train'], f['y_train']
    x_test, y_test = f['x_test'], f['y_test']

word_index = reuters.get_word_index()
index_to_word = {index + 3: word for word, index in word_index.items()}
index_to_word[0] = '<PAD>'
index_to_word[1] = '<START>'
index_to_word[2] = '<UNK>'