If the lbfgsb bundled with python-scipy is replaced with a separate package,
the latter should receive something like the following patch, which is
included in the SciPy-bundled version of lbfgsb per
https://github.com/scipy/scipy/issues/2261
(Synopsis: There are a few places in the lbfgsb code where the no-printing flag
is ignored.)
--- a/lbfgsb.f
+++ b/lbfgsb.f
@@ -2550,7 +2550,9 @@
if (gd .ge. zero) then
c the directional derivative >=0.
c Line search is impossible.
- write(6,*)' ascent direction in projection gd = ', gd
+ if (iprint .ge. 0) then
+ write(6,*)' ascent direction in projection gd = ', gd
+ endif
info = -4
return
endif
@@ -3279,8 +3281,10 @@
55 continue
if ( dd_p .gt.zero ) then
call dcopy( n, xp, 1, x, 1 )
- write(6,*) ' Positive dir derivative in projection '
- write(6,*) ' Using the backtracking step '
+ if (iprint .ge. 0) then
+ write(6,*) ' Positive dir derivative in projection '
+ write(6,*) ' Using the backtracking step '
+ endif
else
go to 911
endif
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