ZeroDivisionError when computing Jaccard or Cosine distances

[rsgoncalves]

For Jaccard distance

  File "/users/home/docs/strdist.py", line 67, in <listcomp>
    distances = np.array([[jac.distance(w1, w2) for w1 in tokens] for w2 in tokens])
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/similarity/jaccard.py", line 32, in distance
    return 1.0 - self.similarity(s0, s1)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/similarity/jaccard.py", line 51, in similarity
    return 1.0 * inter / len(union)
ZeroDivisionError: float division by zero

And for Cosine distance

  File "/users/home/docs/strdist.py", line 75, in <listcomp>
    distances = np.array([[cos.distance(w1, w2) for w1 in tokens] for w2 in tokens])
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/similarity/cosine.py", line 35, in distance
    return 1.0 - self.similarity(s0, s1)
  File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/similarity/cosine.py", line 49, in similarity
    self._norm(profile0) * self._norm(profile1))
ZeroDivisionError: float division by zero

[luozhouyang]

Hi @rsgoncalves I have fixed this ZeroDivisionError.
This bug was caused by shigle_based.py.