This change only affects the TRUST_REGION minimizer and has no effect
on the LINE_SEARCH minimizer.
This options controls the number of iterations that the line search
algorithm performs. The line search algorithm is as the name implies,
used in the LINE_SEARCH minimizer. It is also used by the TRUST_REGION
minimizer when solving bounds constrained optimization problems.
In some bounds constrained problems, it is enough to project each step
onto the bounds constraints and not perform the line search. This can
have a significant impact on runtime. Setting
Solver::Options::max_num_line_search_step_size_iterations = 0 enables
this functionality.
Changchang Wu (ccwu@google.com) came up with the idea for this
implementation.
https://github.com/ceres-solver/ceres-solver/issues/477
Change-Id: Ifbe0bc5c48eedb2c1231d43cd98e4be7316c0682
Sameer Agarwal
7b53262b7f