AttributeError: 'module' object has no attribute 'AbstractModule' about learning-to-learn HOT 9 OPEN

⬢  learning-to-learn  master ✗ gl
Already up-to-date.
⬢  learning-to-learn  master ✗ vim README.md
⬢  learning-to-learn  master ✗ python train.py --problem=mnist --save_path=./mnist
Matplotlib required for plot()
Traceback (most recent call last):
  File "train.py", line 28, in <module>
    import meta
  File "/Users/tomato/Sites/learning-to-learn/meta.py", line 32, in <module>
    import networks
  File "/Users/tomato/Sites/learning-to-learn/networks.py", line 31, in <module>
    import preprocess
  File "/Users/tomato/Sites/learning-to-learn/preprocess.py", line 26, in <module>
    class Clamp(snt.AbstractModule):
AttributeError: 'module' object has no attribute 'AbstractModule'
⬢  learning-to-learn  master ✗ ls
CONTRIBUTING  convergence_test.py  meta.pyc      networks.py       preprocess.py       problems.py       util.py
LICENSE       evaluate.py          meta_test.py  networks.pyc      preprocess.pyc      problems_test.py
README.md     meta.py              mnist/        networks_test.py  preprocess_test.py  train.py
⬢  learning-to-learn  master ✗ gss
?? meta.pyc
?? networks.pyc
?? preprocess.pyc
⬢  learning-to-learn  master ✗ python -V
Python 2.7.13
⬢  learning-to-learn  master ✗ pip -V
pip 9.0.1 from /usr/local/lib/python2.7/site-packages (python 2.7)
⬢  learning-to-learn  master ✗ pip install sonnet
Requirement already satisfied: sonnet in /usr/local/lib/python2.7/site-packages
Requirement already satisfied: networkx==1.8.1 in /usr/local/lib/python2.7/site-packages (from sonnet)

⬢  learning-to-learn  master ✗ pip install dill
Requirement already satisfied: dill in /usr/local/lib/python2.7/site-packages