Description
Conversion of Breeze sparse matrices to Matrix is broken when matrices are product of certain operations. This problem I think is caused by the update method in Breeze CSCMatrix when they add provisional zeros to the data for efficiency.
This bug is serious and may affect at least BlockMatrix addition and substraction
The following code, reproduces the bug (Check test("breeze conversion bug"))
MatricesSuite.scala
test("breeze conversion bug") { // (2, 0, 0) // (2, 0, 0) val mat1Brz = Matrices.sparse(2, 3, Array(0, 2, 2, 2), Array(0, 1), Array(2, 2)).asBreeze // (2, 1E-15, 1E-15) // (2, 1E-15, 1E-15 val mat2Brz = Matrices.sparse(2, 3, Array(0, 2, 4, 6), Array(0, 0, 0, 1, 1, 1), Array(2, 1E-15, 1E-15, 2, 1E-15, 1E-15)).asBreeze // The following shouldn't break val t01 = mat1Brz - mat1Brz val t02 = mat2Brz - mat2Brz val t02Brz = Matrices.fromBreeze(t02) val t01Brz = Matrices.fromBreeze(t01) val t1Brz = mat1Brz - mat2Brz val t2Brz = mat2Brz - mat1Brz // The following ones should break val t1 = Matrices.fromBreeze(t1Brz) val t2 = Matrices.fromBreeze(t2Brz) }
Attachments
Issue Links
- Is contained by
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SPARK-11507 Error thrown when using BlockMatrix.add
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- Resolved
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- links to