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Modified the find_min_single_variable() function so that it is more

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robust when working with functions that are made up of a bunch of
constant value strips.  Previously, these kinds of functions could
cause the optimization to fail.

--HG--
extra : convert_revision : svn%3Afdd8eb12-d10e-0410-9acb-85c331704f74/trunk%403392
This commit is contained in:
Davis King 2010-01-16 19:42:23 +00:00
parent 97300eb360
commit 31c304e13f
1 changed files with 6 additions and 4 deletions
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10
dlib/optimization/optimization_line_search.h
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@ -545,8 +545,9 @@ namespace dlib
{
// check if the minimum is butting up against the bounds and if so then pick
// a point between p1 and p2 in the hopes that shrinking the interval will
// be a good thing to do.
if (p1 == begin)
// be a good thing to do. Or if p1 and p2 aren't differentiated then try and
// get them to obtain different values.
if (p1 == begin || (f1 == f2 && (end-begin) < jump_size ))
{
p3 = p2;
f3 = f2;
@ -575,8 +576,9 @@ namespace dlib
{
// check if the minimum is butting up against the bounds and if so then pick
// a point between p2 and p3 in the hopes that shrinking the interval will
// be a good thing to do.
if (p3 == end)
// be a good thing to do. Or if p2 and p3 aren't differentiated then try and
// get them to obtain different values.
if (p3 == end || (f2 == f3 && (end-begin) < jump_size))
{
p1 = p2;
f1 = f2;