[SciPy-User] A bug in SLSQP?

[Yuxiang Wang]

Hi Ralf,

Thanks for your response! And - yes, sure thing.

Link to the issue:
https://github.com/scipy/scipy/issues/4811

Shawn

On Tue, May 5, 2015 at 2:20 PM, Ralf Gommers <ralf.gommers at gmail.com> wrote:
>
>
> On Tue, May 5, 2015 at 8:08 PM, Yuxiang Wang <yw5aj at virginia.edu> wrote:
>>
>> Dear all,
>>
>> Oops - sorry. Please disregard my previous email. Even though it
>> complains (the warning), it still filled the xl and xu with the right
>> values.
>>
>> Sorry again for the spamming.
>
>
> Thanks for the quick update. Looks to me like there's something to fix
> though. Your bounds are specified correctly, so there shouldn't be a warning
> like that. Can you provide a self-contained example that reproduces the
> warning and open an issue?
>
> Ralf
>
>
>>
>>
>> Shawn
>>
>> On Tue, May 5, 2015 at 1:41 PM, Yuxiang Wang <yw5aj at virginia.edu> wrote:
>> > Dear all,
>> >
>> > In using scipy.optimize.minimize, I encountered a bug when using bounds.
>> >
>> > My bounds is set as: bounds = ((0, None), (0, None), (0, 1), (0, None))
>> >
>> > Then, it will say invalid value encountered in greater bnderr =
>> > where(bnds[:, 0] > bnds[:, 1])[0]
>> >
>> > I looked into slsqp.py, and in line 330, it checks: if bounds is None
>> > or len(bounds) == 0: ...
>> >
>> > Obviously, bounds is not None, so it did not replace 1e12 or -1e12
>> > into the bnds.
>> >
>> >
>> > Could anyone please help? Thanks!
>> >
>> > My scipy version: 0.15.1; numpy version: 1.9.2. I am using Windows 64
>> > bit, Python 3.4.
>> >
>> > Shawn
>> >
>> > --
>> > Yuxiang "Shawn" Wang
>> > Gerling Research Lab
>> > University of Virginia
>> > yw5aj at virginia.edu
>> > +1 (434) 284-0836
>> > https://sites.google.com/a/virginia.edu/yw5aj/
>>
>>
>>
>> --
>> Yuxiang "Shawn" Wang
>> Gerling Research Lab
>> University of Virginia
>> yw5aj at virginia.edu
>> +1 (434) 284-0836
>> https://sites.google.com/a/virginia.edu/yw5aj/
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>
>
>
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-- 
Yuxiang "Shawn" Wang
Gerling Research Lab
University of Virginia
yw5aj at virginia.edu
+1 (434) 284-0836
https://sites.google.com/a/virginia.edu/yw5aj/