GitHub user viirya opened a pull request: https://github.com/apache/spark/pull/17532
[SPARK-20214][ML] Make sure converted csc matrix has sorted indices ## What changes were proposed in this pull request? `_convert_to_vector` converts a scipy sparse matrix to csc matrix for initializing `SparseVector`. However, it doesn't guarantee the converted csc matrix has sorted indices and so a failure happens when you do something like that: from scipy.sparse import lil_matrix lil = lil_matrix((4, 1)) lil[1, 0] = 1 lil[3, 0] = 2 _convert_to_vector(lil.todok()) File "/home/jenkins/workspace/python/pyspark/mllib/linalg/__init__.py", line 78, in _convert_to_vector return SparseVector(l.shape[0], csc.indices, csc.data) File "/home/jenkins/workspace/python/pyspark/mllib/linalg/__init__.py", line 556, in __init__ % (self.indices[i], self.indices[i + 1])) TypeError: Indices 3 and 1 are not strictly increasing A simple test can confirm that `dok_matrix.tocsc()` won't guarantee sorted indices: >>> from scipy.sparse import lil_matrix >>> lil = lil_matrix((4, 1)) >>> lil[1, 0] = 1 >>> lil[3, 0] = 2 >>> dok = lil.todok() >>> csc = dok.tocsc() >>> csc.has_sorted_indices 0 >>> csc.indices array([3, 1], dtype=int32) I checked the source codes of scipy. The only way to guarantee it is `csc_matrix.tocsr()` and `csr_matrix.tocsc()`. ## How was this patch tested? Existing tests. Please review http://spark.apache.org/contributing.html before opening a pull request. You can merge this pull request into a Git repository by running: $ git pull https://github.com/viirya/spark-1 make-sure-sorted-indices Alternatively you can review and apply these changes as the patch at: https://github.com/apache/spark/pull/17532.patch To close this pull request, make a commit to your master/trunk branch with (at least) the following in the commit message: This closes #17532 ---- commit f88eb6b65005c367660d8aabfcd7d9b63ab6b121 Author: Liang-Chi Hsieh <vii...@gmail.com> Date: 2017-04-05T03:22:43Z Make sure converted csc matrix has sorted indices. ---- --- If your project is set up for it, you can reply to this email and have your reply appear on GitHub as well. If your project does not have this feature enabled and wishes so, or if the feature is enabled but not working, please contact infrastructure at infrastruct...@apache.org or file a JIRA ticket with INFRA. --- --------------------------------------------------------------------- To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org For additional commands, e-mail: reviews-h...@spark.apache.org