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こんばんは。
評価関数の学習時にWDLを使うオプションを追加してみました。
learn use_wdl 1 ...のように指定すると、sigmoidを使うwinning_percentage()の代わりにWDLを用いた勝率を使うようになります。単純に、以下のような実装にしてみました。
valueだけではなくgamePlyを使うところが通常と異なります。
ただ、手元で少し学習させてみましたところ、あまり効果がないようでした。(というより、逆効果でした)
ですので、このプルリクエスト自体はマージして頂かなくても問題ありません。
将来的には学習でWDLを活用できれば面白いかと思い、プルリクエストという形で提起させて頂きました次第です。