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機械学習勉強会2017/5/14
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友人との機械学習勉強会で発表。
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機械学習勉強会2017/5/14
1.
誤差逆伝潘法 機械学習勉強会2017/5/14 Koki Natsume
2.
目次 1.誤差逆伝播法とは 2.理論と方法 3.単純なレイヤの実装 4.おわり、まとめ
3.
誤差逆伝潘法とは NNの学習を ザックリ言うと
4.
誤差逆伝潘法とは 勾配法を使ってできる だけ小さい損失関数 (誤差)を探していく
5.
誤差逆伝潘法とは で
6.
誤差逆伝潘法とは その重みパラメータに 関する損失関数の 勾配の計算を 効率よく求める方法が
7.
誤差逆伝潘法とは 誤差逆伝播法
8.
理論と方法 誤差逆伝播法は計算グラフというものを利用するとわかりやすい 計算グラフの例)100円のりんごを2個買う(消費税10%)。 x 2 x
1.1 100 200 220
9.
理論と方法 誤差逆伝播法は計算グラフというものを利用するとわかりやすい 計算グラフの例)100円のりんごを2個買う(消費税10%)。 x 2 x
1.1 100 200 220 複雑な計算も局所的にすることで理解しやすくなる!
10.
理論と方法 誤差逆伝播法は計算グラフというものを利用するとわかりやすい 計算グラフの例)100円のりんごを2個買う(消費税10%)。 x 2 x
1.1 100 200 220 2.2 1.1 1 逆伝播は 1 -> 1.1 -> 2.2 と微分値が伝播されている
11.
理論と方法 誤差逆伝播法は計算グラフというものを利用するとわかりやすい 計算グラフの例)100円のりんごを2個買う(消費税10%)。 x 2 x
1.1 100 200 220 2.2 1.1 1 これはりんごが1円上がったら、支払いが2.2円上がるということ
12.
理論と方法 誤差逆伝播法は計算グラフというものを利用するとわかりやすい 計算グラフの例)100円のりんごを2個買う(消費税10%)。 x 2 x
1.1 100 200 220 2.2 1.1 1 このように各変数の微分値を効率よく計算できる!
13.
sigmoidレイヤ せっかくだし、sigmoid(活性関数)レイヤで実装してみる。 これね
14.
sigmoidレイヤ 計算グラフだとこうなる。 x exp +
/ y = 1/1+exp(-x)1+exp(-x)exp(-x) 1-1 -xx
15.
sigmoidレイヤ 計算グラフだとこうなる。 x exp +
/ y = 1/1+exp(-x)1+exp(-x)exp(-x) 1-1 -xx - (∂L/∂y)*y^ 2 ∂L/∂ y - (∂L/∂y)*y^ 2 - (∂L/∂y)*y^2*exp (-x) (∂L/∂y)*y^2*exp (-x)
16.
sigmoidレイヤ doutは渡ってきた微分値、sigmoidは別で定義された関数ってことで
17.
まとめ、おわりに 勾配を効率よく求める方法として誤差逆伝播法があ る。 誤差逆伝播法は計算グラフを用いると可視化できて 理解しやすくなる。他にも色々と応用できそう。 次はなにやるかまだ考え中。。 学習に関してもっと突っ込むか、別な手法やるか。
18.
ご清聴あざっす。
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