Ignacio Bermudez Corrales created SPARK-20687:
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Summary: mllib.Matrices.fromBreeze may crash when converting
breeze CSCMatrix
Key: SPARK-20687
URL: https://issues.apache.org/jira/browse/SPARK-20687
Project: Spark
Issue Type: Bug
Components: MLlib
Affects Versions: 2.1.1
Reporter: Ignacio Bermudez Corrales
Priority: Critical
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
http://stackoverflow.com/questions/33528555/error-thrown-when-using-blockmatrix-add/43883458#43883458
The following code, reproduces the bug.
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)
}
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