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Precision Motion Control Lab
National Taiwan Normal University
1
圖形辨認(Pattern Recognition)期末專題
以Pocket Perceptron訓練的
上下樓梯辨識穿戴式裝置
機電工程系碩士班 林高遠
Precision Motion Control Lab
National Taiwan Normal University
2
研究動機
Precision Motion Control Lab
National Taiwan Normal University
3
實驗設計
起點
折返點
Y
X
Z
Y
X
Z
三軸加速規
±6G
Precision Motion Control Lab
National Taiwan Normal University
4
自幹的實驗設備
SW, FW, HW
一手包辦
Precision Motion Control Lab
National Taiwan Normal University
5
計劃流程
分析
訓練&學
習
分類
實際應用
Precision Motion Control Lab
National Taiwan Normal University
6
目測資料趨勢
上樓梯--→停止-→下樓梯
Precision Motion Control Lab
National Taiwan Normal University
7
目測資料趨勢
上樓梯--→停止-→下樓梯
Precision Motion Control Lab
National Taiwan Normal University
8
特徵空間分布
本訓練集無法完全線性可分
無法找到任一條線完全切開兩類
Precision Motion Control Lab
National Taiwan Normal University
9
libsvm
Precision Motion Control Lab
National Taiwan Normal University
其他方法?
• kNN – 搜尋太久,而且搜尋時間變動大
• Bayes – 找不出能描述資料分布的模型
10
Precision Motion Control Lab
National Taiwan Normal University
Perceptron
11
限制:訓練集必須要完全線性可分
Precision Motion Control Lab
National Taiwan Normal University
Pocket Perceptron
12
Precision Motion Control Lab
National Taiwan Normal University
何謂 Pocket Perceptron ?
13
「甚至不願離開很爛的對象,
只因為不確定下一個會不會更
好?」
- 女王 ”擺脫妳的爛男人體質”
Precision Motion Control Lab
National Taiwan Normal University
訓練 Pocket Perceptron
14
W(0)=隨機
W=[1秒內加速度峰對峰 , BMI, 標籤]
比照libsvm資料格
式
1 1: 38 2: 21
2 1: 117 2: 23
資料數:
上樓梯 4547
下樓梯 3759
Precision Motion Control Lab
National Taiwan Normal University
訓練 Pocket Perceptron 結果
15
4567 /(上樓梯4547 + 下樓梯
3759)=54%
幾乎只剩50%,與random差不多
→未能容錯, 修正過度
若對樣本排序洗牌,更慘!
45 /(上樓梯4547 + 下樓梯3759)=0.54%
→未能容錯, 修正過度
Precision Motion Control Lab
National Taiwan Normal University
訓練 Pocket Perceptron 結果
16
54% → 77%
尚未做交叉訓練
改良
加入觀察期
if(PRcounter>樣本數)
{
//修正
}
Precision Motion Control Lab
National Taiwan Normal University
訓練 Pocket Perceptron 結果
17
漂亮分割
Precision Motion Control Lab
National Taiwan Normal University
18
計劃流程
分析
訓練&學
習
分類
實際應用
Precision Motion Control Lab
National Taiwan Normal University
• 分類器層數不夠多
• 訓練資料不夠多
資料蒐集裝置未模組化
配戴難看,難找受試者
→已改良(如圖)
19
檢討

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以Pocket perceptron訓練的上下樓梯辨識穿戴式裝置

  • 1. Precision Motion Control Lab National Taiwan Normal University 1 圖形辨認(Pattern Recognition)期末專題 以Pocket Perceptron訓練的 上下樓梯辨識穿戴式裝置 機電工程系碩士班 林高遠
  • 2. Precision Motion Control Lab National Taiwan Normal University 2 研究動機
  • 3. Precision Motion Control Lab National Taiwan Normal University 3 實驗設計 起點 折返點 Y X Z Y X Z 三軸加速規 ±6G
  • 4. Precision Motion Control Lab National Taiwan Normal University 4 自幹的實驗設備 SW, FW, HW 一手包辦
  • 5. Precision Motion Control Lab National Taiwan Normal University 5 計劃流程 分析 訓練&學 習 分類 實際應用
  • 6. Precision Motion Control Lab National Taiwan Normal University 6 目測資料趨勢 上樓梯--→停止-→下樓梯
  • 7. Precision Motion Control Lab National Taiwan Normal University 7 目測資料趨勢 上樓梯--→停止-→下樓梯
  • 8. Precision Motion Control Lab National Taiwan Normal University 8 特徵空間分布 本訓練集無法完全線性可分 無法找到任一條線完全切開兩類
  • 9. Precision Motion Control Lab National Taiwan Normal University 9 libsvm
  • 10. Precision Motion Control Lab National Taiwan Normal University 其他方法? • kNN – 搜尋太久,而且搜尋時間變動大 • Bayes – 找不出能描述資料分布的模型 10
  • 11. Precision Motion Control Lab National Taiwan Normal University Perceptron 11 限制:訓練集必須要完全線性可分
  • 12. Precision Motion Control Lab National Taiwan Normal University Pocket Perceptron 12
  • 13. Precision Motion Control Lab National Taiwan Normal University 何謂 Pocket Perceptron ? 13 「甚至不願離開很爛的對象, 只因為不確定下一個會不會更 好?」 - 女王 ”擺脫妳的爛男人體質”
  • 14. Precision Motion Control Lab National Taiwan Normal University 訓練 Pocket Perceptron 14 W(0)=隨機 W=[1秒內加速度峰對峰 , BMI, 標籤] 比照libsvm資料格 式 1 1: 38 2: 21 2 1: 117 2: 23 資料數: 上樓梯 4547 下樓梯 3759
  • 15. Precision Motion Control Lab National Taiwan Normal University 訓練 Pocket Perceptron 結果 15 4567 /(上樓梯4547 + 下樓梯 3759)=54% 幾乎只剩50%,與random差不多 →未能容錯, 修正過度 若對樣本排序洗牌,更慘! 45 /(上樓梯4547 + 下樓梯3759)=0.54% →未能容錯, 修正過度
  • 16. Precision Motion Control Lab National Taiwan Normal University 訓練 Pocket Perceptron 結果 16 54% → 77% 尚未做交叉訓練 改良 加入觀察期 if(PRcounter>樣本數) { //修正 }
  • 17. Precision Motion Control Lab National Taiwan Normal University 訓練 Pocket Perceptron 結果 17 漂亮分割
  • 18. Precision Motion Control Lab National Taiwan Normal University 18 計劃流程 分析 訓練&學 習 分類 實際應用
  • 19. Precision Motion Control Lab National Taiwan Normal University • 分類器層數不夠多 • 訓練資料不夠多 資料蒐集裝置未模組化 配戴難看,難找受試者 →已改良(如圖) 19 檢討