[pymvpa] Searchlight question

[Per B. Sederberg]

Hi Folks:

I'm gearing up to do a searchlight analysis (with the bleeding edge
development code) and, when reading through the searchlight.py example
(and making some minor corrections to the text), I learned how
center_ids work.  This is an awesome feature, but I wonder if it
should be attached to the searchlight run call instead of to the init
call.

Specifically, we currently set the center_ids like this:

sl = sphere_searchlight(cv, radius=radius, space='voxel_indices',
                             center_ids=center_ids,
                             postproc=mean_sample())

But might it be better to keep the searchlight instance divorced from
the dataset and pass it in at runtime:

sl_map = sl(ds, center_ids=center_ids)


I have not looked closely at the underlying code, so I don't know if
there is a specific reason it works as it does.  Any thoughts?

Best,
Per