LinearOperatorTestCase's _test_triangular_linear_op_inv_quad_logdet is not executed in the current test suite because of the leading underscore. When this underscore is removed, the test executes but fails.
In particular, the test calls _test_inv_quad_logdet and checks if this uses a call to cholesky. However, derived test classes like TestLowRankRootAddedDiagLinearOperator, TestLowRankRootAddedDiagLinearOperatorBatch and TestSumKroneckerLinearOperator apparently don't use Cholesky-based inference for this step (see here for the low rank test), which makes the test fail.
LinearOperatorTestCase's_test_triangular_linear_op_inv_quad_logdetis not executed in the current test suite because of the leading underscore. When this underscore is removed, the test executes but fails.In particular, the test calls
_test_inv_quad_logdetand checks if this uses a call tocholesky. However, derived test classes likeTestLowRankRootAddedDiagLinearOperator,TestLowRankRootAddedDiagLinearOperatorBatchandTestSumKroneckerLinearOperatorapparently don't use Cholesky-based inference for this step (see here for the low rank test), which makes the test fail.