A Ceres Context holds common global state that can be re-used within
Ceres. The Context current contains a thread pool if compiling with
C++11 threading support. Threads are expensive to create and destroy so
it is good to maintain across multiple Ceres solves.
Tested by compiling with and without TBB support and ran unit tests. Ran
bazel as well.
Change-Id: I82f598dfae642aa0e81a6039dc174608a5e8dbfb
It appears that interspersing ifdefs with macros causes problems
with Visual Studio. This patch changes the way we condition
the tests for dense linear solvers based on whether LAPACK is
available or not.
Change-Id: I306247496265c3551edad6bc8fcec9d4cf09e68d
1. Break up unsymmetric_linear_solver_test into
a. dense_linear_solver_test which covers DENSE_QR and
DENSE_NORMAL_CHOLESKY.
b. sparse_normal_cholesky_solver_test which covers
SPARSE_NORMAL_CHOLESKY.
2. dense_linear_solver_test has been completely re-written. It now
uses value parameterized tests for better logging. The number of
test problems as been increased to 2. Last but not the least
the actual test of correctness is not based on a golden solution
computed using another linear solver. We now compute the residual
and ensure that it is small.
https://github.com/ceres-solver/ceres-solver/issues/279
Change-Id: I9546a43e8ae85c31b2096a99405e47da326755ee
Keir Mierle