[test] Fix previous discovered flaky test_sparse_linear_solver.py. #8110
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Issue: #8045
Brief Summary
test_sparse_linear_solver.py
failed randomly before as reported in issue #8045. The reason for the failures was two-fold:dtype
was not aligned between theSparseMatrixBuilder
and theSparseSolver
, that caused 95% of the failures.With this PR fixing both of the issues,
test_sparse_linear_solver.py
should pass robustly enough.Additional Comment
Note that with this PR, the two tests that were skipped before (
test_gpu_sparse_solver
andtest_gpu_sparse_solver2
) now come back. @ailzhang