scikit-learn/scikit-learn — pull request #1193 by larsmans (2012-09-29 21:07:28+00:00)
Title: MRG build CSR instead of COO matrix in DictVectorizer and use array.array

Somewhat related to #1135 which also tries to leverage `array.array`, and which is still on my TODO list for reviewing and merging.

This one should be pretty uncontroversial, except for the fact that we haven't ever used `array.array` before and it isn't really NumPy-friendly (little control over the `itemsize` of an array).