基于Keras RNN的Python拼写纠错实现技术问询

我最近在做基于RNN的拼写纠错任务，下面是我用到的代码片段：

from __future__ import print_function, division, unicode_literals
import os
import errno
from collections import Counter
from hashlib import sha256
import re
import json
import itertools
import logging
import requests
import numpy as np
import pandas as pd
from numpy.random import choice as random_choice, randint as random_randint, shuffle as random_shuffle, seed as random_seed, rand
from numpy import zeros as np_zeros
# pylint:...（此处保留原注释内容）

内容的提问来源于stack exchange，提问作者Ranjana Girish