R: [Coin-discuss] OSI design and cooperation with COIN

[Luigi Poderico]

Hi Laci,

have you some news?

bye, Luigi

-----Messaggio Originale-----
Da: Laszlo Ladanyi <ladanyi at us.ibm.com>
A: <coin-discuss at oss.software.ibm.com>
Data invio: martedì 24 luglio 2001 2.39
Oggetto: Re: [Coin-discuss] OSI design and cooperation with COIN


> I have to eat my words :-(...
>
> I was working yestarday and all day today trying to finish the
implementation
> of the design Luigi and Antonio suggested (to get it clean and efficient)
but
> so far failed. Tomorrow morning I'll post a longer discussion on what the
> problems are.
>
> Anyway, for now we'll still do a reorganization of the packages to make
the
> structure of the repository cleaner. Also, there are lots of changes
(mostly
> additions) in the devel tree which should become the stable version ASAP.
> Therefore we'll just make the current devel tree to be the stable one
tomorrow
> (and do the reorg) and the OSI redesign will go to the next devel tree.
But we
> should do the redesign eventually (and the sooner the better).
>
> Until tomorrow,
> --Laci
>
> On Fri, 20 Jul 2001 coin-discuss-admin at dwoss.lotus.com wrote:
>
> > Hi,
> >
> > Sorry that it so long to respond...
> >
> > The class design suggested sounds good. We were thinking a bit on
whether the
> > solver interface should be even more general (i.e., not to assume even
linear
> > constraints), but then one could write a brand new class hierarchy
instead. We
> > got to assume something :-).
> >
> > We may shorten the name SolverInterface to SI. It's just too long to
type :-).
> >
> > Actually, we have been coding the conversion for the past couple of days
(it's
> > not that hard, just there are other things to do, too), and expect to
make the
> > switch at the same time as the current devel version becomes the stable
> > version. The planned date for that is next Monday. So if all goes well,
You
> > can start to look at it on Tuesday. I'll post to the list about our
progress
> > with the switch.
> >
> > --Laci
> >
> > On Sun, 15 Jul 2001, Luigi Poderico wrote:
> >
> > > Hi to J.P., Laci and everyone,
> > >
> > > I have talked a lot with Antonio about different designs of OSI and
the
> > > possibility to cooperate with COIN community, reaching the following
> > > statements:
> > >
> > > *** OSI Design ***
> > > The hierarchy of the OSI classes should be the following:
> > >
> > > OsiSolverInterface
> > >     OsiLpSolverInterface : public virtual OsiSolverInterface;
> > >         OsiSimplexLpSolverInterface : public virtual
OsiLpSolverInterface;
> > >         OsiVolumeLpSolverInterface : public virtual
OsiLpSolverInterface;
> > >         OsiBarrierLpSolverInterface : public virtual
OsiLpSolverInterface;
> > >     OsiQpSolverInterface : public virtual OsiSolverInterface;
> > >     OsiMipSolverInterface : public virtual OsiSolverInterface;
> > >
> > > The class OsiSolverInterface should be contain all and only the
methods
> > > shared by all the others interfaces: basically methods for express
linear
> > > constraints.
> > > The other classes add to OsiSolverInterface methods for linear
programming,
> > > quadratic programming, etc.
> > > All the classes of the diagram are abstract having some virtual pure
> > > methods, i.e. Solve() method.
> > >
> > > Concrete classes close the diagram, eventually making some diamonds:
i.e.
> > > OsiOslSolverInterface close a big diamond deriving from
> > > OsiSimplexLpSolverInterface, OsiBarrierLpSolverInterface,
> > > OsiQpSolverInterface and OsiMipSolverInterface; OsiVolSolverInterface
derive
> > > from OsiVolumeLpSolverInterface; etc.
> > >
> > > *** Cooperation with COIN community ***
> > > The smallest step, in order to transform the actual OSI classes
diagram (say
> > > OSI version 1) in to the diagram above suggested (say OSI version 2),
could
> > > be to write the core of diagram paying attention to minimize the code
> > > rewriting.
> > >
> > > The core of diagram could be the following:
> > >
> > > OsiSolverInterface
> > >     OsiLpSolverInterface : public virtual OsiSolverInterface;
> > >         OsiOslSolverInterface: public OsiLpSolverInterface;
> > >         OsiCpxSolverInterface: public OsiLpSolverInterface;
> > >         OsiVolSolverInterface: public OsiLpSolverInterface;
> > >         OsiXprSolverInterface: public OsiLpSolverInterface;
> > >     OsiQpSolverInterface : public virtual OsiSolverInterface;
> > >         OsiCpxSolverInterface: public OsiQpSolverInterface;
> > >
> > > Granting that the public interface offered by OsiSolverInterface
(version 2)
> > > + OsiLpSolverInterface cover completely the public interface of
> > > OsiSolverInterface (version 1), OsiVolSolverInterface and
> > > OsiXprSolverInterface doesn't require any modification.
> > > Only OsiOslSolverInterface and OsiCpxSolverInterface need some
extensions in
> > > order to (eventually) implement the QP facility of
OsiQpSolverInterface.
> > >
> > > Actually, we have checked that no methods are required in
> > > OsiLpSolverInterface because the interface of OsiSolverInterface is
enough,
> > > but we think that when
> > > OsiSimplexLpSolverInterface, OsiVolumeLpSolverInterface and
> > > OsiBarrierLpSolverInterface will be implemented OsiLpSolverInterface
will
> > > contain some  shared methods , i.e. bool ReturnigBaseSolution(). This
is the
> > > reason why we left an empty class in the core diagram.
> > >
> > > If you accomplish our ideas, we can wait the next release of OSI and
> > > starting from it to write the core diagram, including
OsiLpSolverInterface
> > > and OsiQpSolverInterface, and extend OsiCpxSolverInterface (version
1).
> > >
> > > Bye bye,
> > > Luigi
> > >
> > > ^^^^^^^^^^^^^^^^^^^^^^^^^^
> > >
> > > Poderico Luigi
> > > Ind.: via Pesenti, 19 - 56124 Pisa
> > > Tel.: +39 329 8151210
> > > Fax. +39 1782261666
> > > e-mail: lupoderi at tiscalinet.it
> > >
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> >
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