[SciPy-User] fmin_l_bfgs_b stdout gets mixed into following Python stdout

[Daan Wynen]

sadly, the -u flag doesn't help after all.
I guess for the moment at least I have to live with this... :/

On 01/29/2015 04:32 PM, Matthew Gidden wrote:
> If this works for you, not that you can also set the PYTHONUNBUFFERED 
> <https://docs.python.org/2/using/cmdline.html#envvar-PYTHONUNBUFFERED> 
> environment variable (in case you're running this via a testing 
> framework, for instance).
>
> On Thu, Jan 29, 2015 at 9:25 AM, Jaidev Deshpande 
> <deshpande.jaidev at gmail.com <mailto:deshpande.jaidev at gmail.com>> wrote:
>
>
>
>     On Thu, Jan 29, 2015 at 8:28 PM, Daan Wynen <daan.wynen at inria.fr
>     <mailto:daan.wynen at inria.fr>> wrote:
>
>         Hi,
>
>         I couldn't find anything about this issue, and it is not
>         critical but annoying.
>         Whenever I run the solver, the standard output order gets
>         mixed up.
>         What I want to see is the following (blank lines stripped out
>         for saving space):
>
>         ...
>         ME SAYS: Unoptimized objective: 0.947251976788
>
>         RUNNING THE L-BFGS-B CODE
>                    * * *
>         Machine precision = 2.220D-16
>          N =           50     M =           20
>         At X0         0 variables are exactly at the bounds
>         At iterate    0    f=  9.47252D-01    |proj g|=  1.04635D-01
>         At iterate    1    f=  7.95655D-01    |proj g|=  9.16550D-02
>         ...
>         At iterate 3769    f=  7.12543D-05    |proj g|=  2.07939D-05
>         At iterate 3770    f=  7.12527D-05    |proj g|=  1.51021D-04
>                    * * *
>         Tit   = total number of iterations
>         ...
>          Total User time 0.000E+00 seconds.
>
>         ME SAYS: After optimization: 7.1252665476e-05
>         ...
>
>
>         Instead, what I get is this:
>
>
>         ...
>         ME SAYS: Unoptimized objective: 0.947251976788
>
>         RUNNING THE L-BFGS-B CODE
>                    * * *
>         Machine precision = 2.220D-16
>          N =           50     M =           20
>         At X0         0 variables are exactly at the bounds
>         At iterate    0    f=  9.47252D-01    |proj g|=  1.04635D-01
>         At iterate    1    f=  7.95655D-01    |proj g|=  9.16550D-02
>         ...
>         At iterate 3147    f=  8.09457D-05    |proj g|=  5.97659D-05
>
>         ME SAYS: After optimization: 7.1252665476e-05
>         At iterate 3148    f=  8.09298D-05    |proj g|=  5.19516D-05
>         ...
>         At iterate 3769    f=  7.12543D-05    |proj g|=  2.07939D-05
>         At iterate 3770    f=  7.12527D-05    |proj g|=  1.51021D-04
>                    * * *
>         Tit   = total number of iterations
>         ...
>          Total User time 0.000E+00 seconds.
>         ...
>
>         Obviously, when I run an experiment, I would like to see the
>         result at the end, and not buried somewhere in the middle of
>         the iteration outputs.
>         I tried passing callback=lambda _: sys.stdout.flush() and
>         putting another flush after the whole optimization, but it
>         didn't help.
>         The example is on a very fast toy calculation, but this also
>         happens when each iteration takes multiple seconds.
>
>         I am using:
>         python 2.7.3 (virtualenv from Fedora 18 distribution)
>         scipy 0.14.1
>         numpy 1.9.1
>         But this also happens on Canopy.
>
>         Is this maybe just to be expected when interfacing with
>         fortran, or am I using this the wrong way?
>
>         Best Regards
>         Daan Wynen
>
>         _______________________________________________
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>         SciPy-User at scipy.org <mailto:SciPy-User at scipy.org>
>         http://mail.scipy.org/mailman/listinfo/scipy-user
>
>
>     Perhaps this can be fixed by running your Python script in the
>     unbuffered output mode, as
>
>     $ python -u foo.py
>
>     -- 
>     JD
>
>     _______________________________________________
>     SciPy-User mailing list
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>
>
>
>
> -- 
> Matthew Gidden
> Ph.D. Candidate, Nuclear Engineering
> The University of Wisconsin -- Madison
> Ph. 225.892.3192
>
>
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