April 2020
Intermediate to advanced
552 pages
6h 13m
Japanese
Content preview from ゼロから作るDeep Learning ❸ ―フレームワーク編
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ステップ20演算子のオーバーロード（1）
前ステップでは、Variableを“透明な箱”にする仕掛けを作りました。しかし、その仕掛けはまだ完成していません。残る課題は、+や*などの演算子に対応することです。たとえば、aとbをVariableインスタンスとしたとき、y = a * bと書けると便利です。そのように拡張することが本ステップの目標です。
![[注記]](/api/v2/epubs/urn:orm:book:9784873119069/files/images/note.png) |
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私たちの最終的な目標は、 |
これから、+や*の演算子が扱えるようにVariableを拡張していきます。その前に、私たちは掛け算を行う関数を実装する必要があります（足し算についてはステップ11で実装しました）。そこで、まずは掛け算を行うクラスをMulとして実装します。ちなみに、MulはMultiplyの略です。
20.1 Mulクラスの実装
掛け算の微分は、
のとき、、と求められます。この結果から、図20-1の手順で逆伝播を行えばよいことが分かります。
図20-1 掛け算の順伝播（上図）と逆伝播（下図） ...
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