[SciPy-dev] scipy.optimize

Ed Schofield schofield at ftw.at
Fri Apr 28 04:45:09 CDT 2006


Robert Cimrman wrote:
> Yes, fmin_l_bfgs_b uses a wrapped fortran module, so I can think only 
> about rewriting its high-level logic (the main iteration loop?) in 
> Python, using directly the fortran subroutines. But all functions in 
> optimize.py could use the common interface without pain.
>
> The two main possibilities are:
> 1) call back each iteration (as I do in my fmin_sd) only
> 2) call back via wrap_function macro, so that function/gradient calls 
> e.g. in line search functions are not missed - the callback could have 
> one arg saying from where it was called, so that in postporcessing you 
> could plot e.g. just the data from main loop iterations.
>
> Now as I have written them down, I would vote for 2) in some form.
>   

Yes, (2) would be good :)

>> We'd also need to consider how to specify stopping criteria uniformly;
>> currently the functions use several different definitions of tolerance,
>> such as the mean or the norm of the gradient vector.  It would be great
>> to unify these.
>>     
>
> I will send you off-list how I have it for now.
>   

It looks like a good start.  I suggest you copy the whole scipy.optimize
package into the sandbox (e.g. as 'newoptimize') and check your code in
there...

-- Ed




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