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脳裏に焼き付けて二度と復習しない誤差逆伝搬法
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脳裏に焼き付けて二度と復習しない誤差逆伝搬法
1.
脳裏に焼き付けて 二度と復習しない 誤差逆伝搬法 @piroyoung
2.
今日のまとめ 「誤差逆伝搬って,フィードフォワードネットワークの勾配法でしょ?」
3.
今日のまとめ 「誤差逆伝搬って,フィードフォワードネットワークの勾配法でしょ?」 ▶それっぽい発言で友達が増える.
4.
今日やること キーワード ● ニューロン(neuron) ● パーセプトロン(perceptron) ●
活性化関数(activation function) ● シグモイド(sigmoid) ● 勾配法(gradient descent) ● フィ・・・(feed forward network) ● 誤差逆伝搬法(back propagation)
5.
ニューロン(newron)
6.
Neuron
7.
Neuron ◀input
8.
Neuron ◀input ◀output
9.
Neuron ◀input ◀output ◀answer
10.
Neuron ◀input ◀output ◀answer ◀neuron
11.
パーセプトロン(perceptron)
12.
Perceptron
13.
Perceptron ◀weight
14.
Perceptron ◀weight ◀activation function
15.
Perceptron \LinearなNeauron!/
16.
Perceptron (learning) 収束するまで繰り返す!
17.
Perceptron (learning)
18.
Perceptron (learning) ●
19.
Perceptron (learning) ●
20.
Perceptron (learning) ●
21.
シグモイド(sigmoid)
22.
Sigmoid 関数 を下記で定義する. また,その導関数は
23.
Sigmoid 関数 を下記で定義する. また,その導関数は ◀脳裏に焼き付ける
24.
Sigmoid
25.
フィ..(Feedfoward Network)
26.
Feed-foward Network
27.
Feed-foward Network Input layer
hidden layer output layer
28.
Feed-foward Network input!
29.
Feed-foward Network input! ◀receptive field
30.
Feed-foward Network input! ◀receptive field ▼脳裏に焼き付ける
31.
勾配降下(Gradient Descent)
32.
Gradient descent method :損失関数・残差 (e.g)
二乗誤差
33.
Gradient descent method
34.
Gradient descent method ▼脳裏に焼き付ける ▲勾配ベクトル
35.
誤差逆伝搬(Backpropagation)
36.
Backpropagation Feed Forward Network
の各重みの更新式は下記で得られる. ただし,
37.
自明ですか??
38.
自明ですか?? Yes → \スゲェ!/
39.
自明ですか?? Yes → \スゲェ!/ No
→ 進む
40.
一番単純なケースを 考えます.
41.
Backpropagation (first layer)
42.
Backpropagation (first-layer)
43.
Backpropagation (first-layer)
44.
Backpropagation (first-layer)
45.
Backpropagation (first-layer)
46.
Backpropagation (first-layer) ◀脳裏に焼き付ける
47.
Backpropagation (second layer)
48.
Backpropagation (second layer)
49.
Backpropagation (second layer)
50.
Backpropagation (second layer)
51.
Backpropagation (second layer) ◀脳裏に焼き付ける
52.
を得る. Backpropagation (second layer) 一般のFeedfoward
Networkについても,微分の線形性を繰り返し用いれば
53.
脳裏(Nori)
54.
脳裏に焼き付けた式
55.
脳裏に焼き付けた式
56.
脳裏に焼き付けた式
57.
脳裏に焼き付けた式
58.
脳裏に焼き付けた式
59.
脳裏に焼き付けた式
60.
Matome(まとめ)
61.
今日のまとめ 「誤差逆伝搬って,フィードフォワードネットワークの勾配法でしょ?」
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