ImportError while importing test module '/code/db/test/test_similarity.py'.
Hint: make sure your test modules/packages have valid Python names.
Traceback:
/usr/local/lib/python2.7/site-packages/six.py:709: in exec_
    exec("""exec _code_ in _globs_, _locs_""")
db/test/test_similarity.py:7: in <module>
    import db.similarity
db/similarity.py:6: in <module>
    import similarity.metrics
similarity/metrics.py:1: in <module>
    import numpy as np
E   ImportError: No module named numpy