Github user MechCoder commented on the pull request:
https://github.com/apache/spark/pull/5946#issuecomment-99560518
@jkbradley I was also thinking of vectorizing the sparse dot. I came up
with this. Can you think of anything better?
def dot(self, other):
cm1 = np.in1d(self.indices, other.indices)
cm2 = np.in1d(other,indices, self.indices)
return np.dot(self.values[cm1], other.values[cm2])
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