Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/5355#discussion_r28042914
--- Diff: python/pyspark/mllib/linalg.py ---
@@ -670,6 +668,23 @@ def toArray(self):
"""
return self.values.reshape((self.numRows, self.numCols), order='F')
+ def toSparse(self):
+ """Convert to Sparse Format"""
+ numRows = self.numRows
--- End diff --
This could be simplified:
~~~python
indices = np.nonzero(self.values)[0]
colPtrs = np.cumsum(np.bincount(indices / self.numRows + 1))
values = self.values[indices]
rowIndices = indices % self.numRows
return SparseMatrix(self.numRows, self.numCols, colPtrs, indices, values)
~~~
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