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漫談人工智慧:啟發自大腦科學的深度學習網路
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2017/1/16 應邀演講 腦機介面控制實作社 主辦 人腦與機器的對話-漫談腦機介面與人工智慧 行政院青創基地 Taiwan Start-Up Hub
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漫談人工智慧:啟發自大腦科學的深度學習網路
1.
+ 漫談人工智慧
2.
+ 神經元 (neuron) 示意圖
3.
+ 神經元間的溝通之處 突觸 (synapse)
4.
+ 跳耀式傳導 (saltatory conduction)
5.
+ 動作電位 (action potential)
6.
+ 皮質柱 (Cortical Column) 相同的接受域
(receptive field)
7.
+ 聯結體 (connectome) 神經系統連接線路圖
8.
+ 長期增益作用 (long-term potentiation, LTP) 刺激輸入神經元而發生在突觸前神經元和突觸後 神經元信號傳輸產生一種持久的增強現象。
9.
+ 海柏學習法則 (Hebb’s learning rule) 突觸前神經元向突觸後神經元持續重複的刺激, 使得神經元之間的突觸強度增加。
10.
+ 人工神經元模型
11.
+ 常用激活函數 (activation function) Sigmoid
function
12.
+ 常用激活函數 Softmax function
13.
+ 常用激活函數 Hyperbolic tangent
14.
+ 常用激活函數 Rectified linear unit
(ReLU)
15.
+ 感知機 (perceptron) 模型
16.
+ 多層感知機 (multi-layer perceptron)
17.
+ 卷積神經網路 (convolutional neural networks)
18.
+ 卷積神經網路 (convolutional neural networks)
19.
+ 卷積神經網路 Convolutional layer Depth
(D): filter ( 或稱 kernel) 組數 Stride (S): 每一次 kernel 移動的間 隔 Zero padding (P): 每一輸入邊緣填 0 的寬度 若以 W 表示輸入寬度大小, F 表示 filter 寬度大小, 卷積運算後 feature map 的寬度大小公式為: D 個 [(W - F + 2P) / S] + 1
20.
+ 卷積神經網路 Convolutional layer
21.
+ 卷積神經網路 Pooling layer
22.
+ 卷積神經網路 Local receptive field
23.
+ 卷積神經網路 Weight sharing 此處
w1 = w4 = w7, w2 = w5 = w8, w3 = w6 = w9 具有 translational invariance 的特性
24.
+ 目標函數 (objective function)
/ 損 失函數 (loss function) 最小化目標函數 J x* = arg min J(x) Mean square error Cross entropy
25.
+ 隨機梯度下降 (stochastic gradient descent,
SGD)
26.
+ 隨機梯度下降 (SGD) minibatchminibatch
27.
+ 倒傳遞演算法 (Back-propagation)
28.
+ 神經網路模型何其多 Hopfield model
Self-organizing feature map Grossberg Network Adaptive Resonance Theory Neocognitron Hierarchical temporal memory Recurrent neural networks Spiking neural networks ……
29.
+ 人工智慧 機器學習 傻傻分不清楚 深度學習 人工智慧的未來
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