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Chainerのチュートリアルで、パッケージをインポートするとエラーが出る 。(mock)

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Introduction to Chainer

chainerをインストールした後、チュートリアルで下記コマンドを実行して、pythonのパッケージを読み込む。

import numpy as np
import chainer
from chainer import cuda, Function, gradient_check, report, training, utils, Variable
from chainer import datasets, iterators, optimizers, serializers
from chainer import Link, Chain, ChainList
import chainer.functions as F
import chainer.links as L
from chainer.training import extensions

すると
下記のエラーが出る。

>>> from chainer import cuda, Function, gradient_check, report, training, utils, Variable
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/Users/hiroyasu/.pyenv/versions/anaconda3-4.2.0/lib/python3.5/site-packages/chainer/gradient_check.py", line 9, in <module>
    from chainer import testing
  File "/Users/hiroyasu/.pyenv/versions/anaconda3-4.2.0/lib/python3.5/site-packages/chainer/testing/__init__.py", line 7, in <module>
    from chainer.testing import training  # NOQA
  File "/Users/hiroyasu/.pyenv/versions/anaconda3-4.2.0/lib/python3.5/site-packages/chainer/testing/training.py", line 1, in <module>
    import mock
ImportError: No module named 'mock'

chainerをインストールしたが、mockというパッケージが無かったらしい。

mockをpipからダウンロードしたら、エラーが出なくなった。

pip install
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