[Numpy-discussion] Deserialization uncouples shared arrays

Hans Meine meine@informatik.uni-hamburg...
Tue Sep 22 07:28:01 CDT 2009


On Tuesday 22 September 2009 13:14:55 Hrvoje Niksic wrote:
> Hans Meine wrote:
> > On Tuesday 22 September 2009 11:01:37 Hrvoje Niksic wrote:
> >> Is it intended for deserialization to uncouple arrays that share a
> >> common base?
> >
> > I think it's not really intended, but it's a limitation by design.
>
> I wonder why a "base" attribute is even restored, then?

Oh, is it?  Don't know if that makes sense, then.

> If there is no
> care to restore the shared views, then views could simply be serialized
> as arrays?

After your posting, I thought they were..

> > AFAIK, it's related to Luca Citi's recent "ultimate base" thread - you
> > simply cannot ensure serialization of arbitrary ndarrays in this way,
> > because they may point to *any* memory, not necessarily an
> > ndarray-allocated one.
>
> That's true in general.  I wonder if it's possible to restore shared
> arrays if (by virtue of "base" attribute) we know that the ndarray
> shares the memory of another ndarray.

For this special case, it looks possible (although slightly dangerous) to me.
It's also a common special case, so maybe you should open a ticket?

Ciao,
  Hans


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