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Revert sigmoid interpolator

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After deep test (1000 games) it seems do not improve anything,
actually seems slightly weaker.

So remove it for now.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
This commit is contained in:
Marco Costalba 2008-11-30 21:16:47 +01:00
parent 08265aef81
commit 9d5d69e435
1 changed files with 1 additions and 7 deletions
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8
src/evaluate.cpp
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@ -1120,13 +1120,7 @@ namespace {
ev = apply_scale_factor(ev, sf[(ev > Value(0) ? WHITE : BLACK)]); ev = apply_scale_factor(ev, sf[(ev > Value(0) ? WHITE : BLACK)]);
// Linearized sigmoid interpolator Value result = Value(int((mv * ph + ev * (128 - ph)) / 128));
int sph = int(ph);
sph -= (64 - sph) / 4;
sph = Min(PHASE_MIDGAME, Max(PHASE_ENDGAME, sph));
Value result = Value(int((mv * sph + ev * (128 - sph)) / 128));
return Value(int(result) & ~(GrainSize - 1)); return Value(int(result) & ~(GrainSize - 1));
} }