[gecode-users] AFC decay with global AFC in search engines

[Christian Schulte]

Hi Kish,

Yes, a decay factor of zero makes normally no sense. If you want me to, I
can change that.

Yes, you are right, there is only one global AFC decay factor.

Cheers
Christian

--
Christian Schulte, KTH, web.it.kth.se/~cschulte/

-----Original Message-----
From: users-bounces at gecode.org [mailto:users-bounces at gecode.org] On Behalf
Of Kish Shen
Sent: Friday, May 23, 2014 04:13 AM
To: users at gecode.org
Subject: Re: [gecode-users] AFC decay with global AFC in search engines

Hi Christian,

Thanks for this. I decided to change my code to ude INT_VAR_AFC_* with a
decay argument, and then I tried to rerun the test. However, I now get a
Gecode exception "AFC: Illegal decay factor" for a factor of 0.0 with

IntAFC afc(*solver, vars, 0.0);

while previously, I was able to set the decay factor to 0 with
afc_decay(0.0).

I assume this is because of a > vs >= test for the valid value. Should this
be changed? It seems 0 should be a legal value (even if it is not too
sensible).

On a related note, from the description in the MPG, I assume there is only a
single AFC decay factor, so setting the decay factor with

IntAFC afc(*solver, vars, decay)

will also change the "global" decay factor, i.e. the one obtained by
afc_decay(). Is this correct?

Cheers,

Kish



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