[developers] [pet] unpacking

[Yi Zhang]

Hi Sergio,

Which version of the ERG are you using? And by  ``don't use the -packing
option'', do you mean setting -packing to 7? or 0? or leave it as default?
Do you sill have -nsolutions=10 when you ``don't use the -packing''. If
-nsolutions is set to be non-zero, the -packing is defaulted to be 15.

I just experimented with the ERG nov-06. It seems that without packing, the
parser hits the memory limit very soon and aborts. Similar situation is
observed for packing with exhaustive unpacking (-packing=7 and/or
-nsolutions=0). With selective unpacking (-packing=15 -nsolutions=10), the
parser seems to be struggling to unpack within the memory limit. However,
due to the huge search space, it seems to take forever.
I'm really not sure this is actually a bug in the selective unpacking code.
But in case the above configuration is different from what you have meant,
do correct me :-)

To PET developers, maybe we need some extra mechanism to control the
behavior of the parser, say a time-out option?

Best,
Yi

On 7/11/07, Sergio Roa <sergior at coli.uni-sb.de> wrote:
>
> Hello,
>
> I am  using the  svn repository version  of cheap, with  the following
> options:
>
> cheap -limit=100000 -tok=fsr -packing=15 -nsolutions=10
>
> When I try to parse the ambiguous sentence:
>
> "It 's hard  to explain to a 17-year-old why someone  they like had to
> go," says Mrs. Ward.
>
> the cheap  process takes  many hours in  the process of  unpacking.
>
> I wonder why this happens. When  I don't use the -packing option I get
> the results  in short  time.
>
> Thanks,
>
> Sergio.
>
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