a special version of it that is optimized for this case.

--HG--
rename : examples/image_ex.cpp => examples/fhog_ex.cpp

representation.

about how they schedule their initial step sizes.  In particular, they will try
to take step sizes that are similar to previously used sizes via a trust region
style scheduling.

backtracking_line_search() by making it use 3rd degree polynomial interpolation
after the first step.  Also made it more robust to alpha inputs with improper
signs.

computations done in f() when computing der().

tests so they work on older versions of visual studio.

that allow you to easily set uniform upper and lower bounds.