tree 7f4ac8e375477544c3bcb398c786c27e93f8cbda
parent 81f413b7205eeaa30cfe72dadf3bcb8812f5a11c
author Sameer Agarwal <sameeragarwal@google.com> 1523029156 -0700
committer Sameer Agarwal <sameeragarwal@google.com> 1523383298 -0700

Enable mixed precision solves.

1. Add Solver::Options::use_mixed_precision_solves,
   and Solver::Options::max_num_refinement_iterations.
2. Make SparseCholesky::Create return a unique_ptr.
3. SparseCholesky::Create now takes LinearSolver::Options
   as an argument.
4. IterativeRefiner's constructor does not require num_cols
   as an argument.
5. SparseNormalCholeskySolver now uses a separate rhs vector.

This basic implementation results in a 10% reduction in solver time
and 30% reduction in linear solver memory usage.

Change-Id: I6830f32cae2febf082d2733262eb2c9f0482b0ea