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2020_04_08_專題進度報告_第五週 線性回歸 SGD 簡單說明
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2020 04 08_week5
1.
日期:2020/04/08 專題進度報告-第五週 指導教授 : 林志學 專題生
: 邱楷能、謝佾明、林知瑩 Linear Regression
2.
Linear Regression DataSet NNModule
Optimizers
3.
Linear Regression DataSet NNModule
Optimizers
4.
Linear Regression DataSet NNModule
Optimizers 建立一個簡單的NN模型 其中包含三層: • 1. 輸入層 (1) • 2. 隱藏層 (10) • 3. 輸出層 (1)
5.
Linear Regression DataSet NNModule
Optimizers 優化器的選用和設定: • SGD :Stochastic Gradient Descent • Lr :Learning Rate
6.
Linear Regression DataSet NNModule
Optimizers Gradient Descent (梯度下降): • 目的:尋找最大梯度 • 方法:往梯度大的方向 移動
7.
Linear Regression DataSet NNModule
Optimizers Gradient Descent: • 公式說明: 利用微分的方法找出參數 的梯度,往梯度的方向去更新 參數(weight) 參數 次數(迭代) W 權重(weight) L L 為損失函數 (loss function) η η 是學習率(learning rate) ∂L/∂W 是損失函數對參數的梯度(微分)
8.
Linear Regression DataSet NNModule
Optimizers Gradient Descent: • η:Learning Rate • Vt 參數: 會跟上一次的更新有關 如果方向相同,Vt會越來越大 W的更新也會越來越快。 學習率 次數 (迭代) 結果 大 少 可能越過最優解 小 多 可能無法收斂 (找到最優)
9.
Linear Regression DataSet NNModule
Optimizers • Momentum (動量): 未加入動量:每次移動的距離是固定的 當加入動量:每次移動的距離取決於過去的速度(物理)
10.
Linear Regression DataSet NNModule
Optimizers
11.
Linear Regression DataSet NNModule
Optimizers 30. 70. 100. 200.
12.
姓名 事項 完成度
時程 邱楷能 Linear Regression 100% 4/4 林知瑩 SGD 參數與公式關係 100% 4/6 謝佾明 SGD 參數與公式關係 100% 4/6 Linear Regression 線性回歸介紹、隨機梯度下降 參數說明、學習率、動量 SGD 參數與公式關係 公式推倒和摻數意義 SGD 參數與公式關係 公式推倒和摻數意義 100 % 80% 20 80% Document 總結和時程規劃
Editor's Notes
https://kknews.cc/news/pbgzzj.html
https://medium.com/%E9%9B%9E%E9%9B%9E%E8%88%87%E5%85%94%E5%85%94%E7%9A%84%E5%B7%A5%E7%A8%8B%E4%B8%96%E7%95%8C/%E6%A9%9F%E5%99%A8%E5%AD%B8%E7%BF%92ml-note-sgd-momentum-adagrad-adam-optimizer-f20568c968db
https://medium.com/%E9%9B%9E%E9%9B%9E%E8%88%87%E5%85%94%E5%85%94%E7%9A%84%E5%B7%A5%E7%A8%8B%E4%B8%96%E7%95%8C/%E6%A9%9F%E5%99%A8%E5%AD%B8%E7%BF%92ml-note-sgd-momentum-adagrad-adam-optimizer-f20568c968db
https://www.itread01.com/content/1543288024.html
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