[gnugo-devel] reading problem

[Portela Fernand]

Around line 5509 of reading.c following can be found

  /* ...and store it in the cache.
   * FIXME: Only store result in cache when we're working at
   * full depth.
   *
   * Comment: This is currently not a problem since no reduced depth
   * reading is performed.
   */

Well, about the above comment, I would say it isn't true. There's a

  decrease_depth_values();

line in compute_initial_influence(). I don't know what to do about it, but
I know that it has this effect : after changing a pattern value in
owl_attackpats.db, a regression test gets broken. In the debug output,
following can be noticed :

Before :

white permeability:
1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 
1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 
1.0 0.6 0.2 0.2 0.4 0.3 0.6 1.0 1.0 
                ^^^
0.0 0.0 0.0 0.0 1.0 0.0 0.0 0.0 0.0 
1.0 0.0 0.0 0.0 1.0 0.0 0.0 0.0 0.0 
1.0 1.0 0.6 1.0 0.6 0.3 0.0 0.0 0.0 
1.0 1.0 1.0 1.0 1.0 0.6 0.0 0.6 1.0 
1.0 1.0 1.0 1.0 1.0 1.0 0.7 1.0 1.0 
1.0 1.0 1.0 1.0 1.0 1.0 0.7 1.0 1.0 

white influence (dragons_known):
  0.1   0.2   0.5   1.2   2.2   1.3   0.6   0.3   0.1 
  0.0   0.1   0.4   1.8   5.1   1.9   0.6   0.2   0.1 
  0.0   0.0   0.2   7.2  29.2   7.2   0.4   0.1   0.0 
  0.0   0.0    X     X     O     X    0.0   0.0   0.0 
  1.0   2.3  11.2    X     O   48.6   0.0   0.0   0.0 
  3.4   7.9  29.2    O   58.3  19.1    X    0.0   0.0 
  2.9   5.9  17.4  31.5  25.1   8.8   2.0   0.0   0.0 
  2.6   5.4   7.8  13.9  10.5   6.7   2.4   0.4   0.1 
  2.0   3.1   4.4   6.5   5.5   3.8   2.2   0.7   0.2 

After:

white permeability:
1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 
1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 1.0 
1.0 0.6 0.2 0.2 0.0 0.3 0.6 1.0 1.0 
                ^^^
0.0 0.0 0.0 0.0 1.0 0.0 0.0 0.0 0.0 
1.0 0.0 0.0 0.0 1.0 0.0 0.0 0.0 0.0 
1.0 1.0 0.6 1.0 0.6 0.3 0.0 0.0 0.0 
1.0 1.0 1.0 1.0 1.0 0.6 0.0 0.6 1.0 
1.0 1.0 1.0 1.0 1.0 1.0 0.7 1.0 1.0 
1.0 1.0 1.0 1.0 1.0 1.0 0.7 1.0 1.0 

white influence (dragons_known):
  0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0 
  0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0   0.0 
  0.0   0.0   0.0   0.0  29.2   0.0   0.0   0.0   0.0 
  0.0   0.0    X     X     O     X    0.0   0.0   0.0 
  1.0   2.3  11.2    X     O   48.6   0.0   0.0   0.0 
  3.4   7.9  29.2    O   58.3  19.1    X    0.0   0.0 
  2.9   5.9  17.4  31.5  25.1   8.8   2.0   0.0   0.0 
  2.6   5.4   7.8  13.9  10.5   6.7   2.4   0.4   0.1 
  2.0   3.1   4.4   6.5   5.5   3.8   2.2   0.7   0.2 


The owl results are strictly identical, though the reading is different,
due to different variations tried.

How should this issue be addressed IYO ?

/nando