如何解决ImportError：无法导入名称'ProcessPoolExecutor'

Question

我第一次尝试使用多语言库时遇到此错误。

from polyglot.text import Text, Word

word = Text("Preprocessing is an essential step.").words[0]
print(word.morphemes)

这是完整的错误消息。

Traceback (most recent call last):
  File "/home/adeesha/PycharmProjects/theme_recomend/plyglot.py", line 2, in <module>
    from polyglot.text import Text, Word
  File "/usr/local/lib/python3.5/dist-packages/polyglot-16.7.4-py3.5.egg/polyglot/__init__.py", line 12, in <module>
    from .base import Sequence, TokenSequence
  File "/usr/local/lib/python3.5/dist-packages/polyglot-16.7.4-py3.5.egg/polyglot/base.py", line 9, in <module>
    from concurrent.futures import ProcessPoolExecutor, as_completed
ImportError: cannot import name 'ProcessPoolExecutor'

Python 3.5.2的版本

我将如何解决这个问题？