ReLUを微分する3つの方法
関数が古典的な意味で微分不可能な場合、一般化された導関数を計算する方法は複数存在する。本記事では、古典的な導関数の3つの一般化を、ニューラルネットワークで広く使われる活性化関数ReLU（ランプ関数）に適用して解説する。
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