2014-07-29 10:22 GMT+02:00 Eustache DIEMERT <eusta...@diemert.fr>:
> So my question is : is there some utility or snippet to load a CSV into CSR
> that I overlooked ?
No, but it's not that hard to write [1].
>>> import array
>>> data = array.array("f")
>>> indices = array.array("i")
>>> indptr = array.array("i", [0])
>>> for i, row in enumerate(csv.reader(f), 1):
... row = np.array(map(float, row))
... n_features = len(row)
... nonzero = np.where(row)[0]
... data.extend(row[nonzero])
... indices.extend(nonzero)
... indptr.append(i)
...
>>> X = csr_matrix((data, indices, indptr), dtype=float, shape=(i, n_features))
Instead of arrays, you can also use plain lists. Arrays take less
space, but they can be a tiny bit slower than lists.
[1] https://gist.github.com/larsmans/fe2a289818299dcb094a
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