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分類器 (ナイーブベイズ)
1.
-
- MATSUURA Satoshi matsuura@is.naist.jp 1
2.
2
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3
4.
20%
35% 85% 4
5.
P (C|D) D
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6.
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(C|D) = P (D) 8
9.
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P (CD) =
P (C|D)P (D) = P (D|C)P (C) • D C x D P (C|D) P (D) • C D x C P (D|C) P (C) 11
12.
P (D|C)P (C) P
(C|D) = P (D) 12
13.
P (D|C)P (C) P
(C|D) = P (D) P (D) P (C|D) 13
14.
P (D|C)P (C) P
(C|D) = P (D) P (C) C C / 14
15.
P (D|C)P (C)
P (C|D) = P (D) P (D|C) C D P (D|C) = 15
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P (D|C)P (C)
P (C|D) = P (D) P (D|C) P (W1 |C)P (W2 |C) · · · P (Wn |C) P (Wi|C) = Wi • ★ ( ) ★ 22
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Wb Wc Wx Wy Wa Wy Wx Wc Wb Wb Wa W W W W W W W W bag of words bag of words 23
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Wa Wz
Wa Wy Wb Wb bag of words Wc Wx Wy 4 P (Cs )P (D|Cs ) P (Wa |Cs )P (Wb |Cs )P (Wy |Cs )P (Wz |Cs ) 7 4 1 2 1 0 = × × × × ) Wz 7 4 4 4 4 =0 27
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popfile
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Wa Wy Wb Wb bag of words Wc Wx Wy 4 P (Cs )P (D|Cs ) P (Wa |Cs )P (Wb |Cs )P (Wy |Cs )P (Wz |Cs ) 7 4 1 2 1 1 = × × × × ) 7 4 4 4 10 × 7 1 = 3920 3 P (Cp )P (D|Cp ) P (Wa |Cp )P (Wb |Cp )P (Wy |Cp )P (Wz |Cp ) 7 3 1 1 1 1 = × × × × ) 7 3 10 × 7 10 × 7 10 × 7 1 P (Cs )P (D|Cs ) P (Cp )P (D|Cp ) = 2401000 32
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DEMO 37
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•
( ) • Web+DB vol.56 p.134-142, , May. 2010. • 4.2 • , p.101-117, , Aug, 2010. • ( ) • http://gihyo.jp/dev/serial/01/machine-learning/0003 • • http://d.hatena.ne.jp/kogecoo/20091103/1257281433 • ( ) • http://homepage3.nifty.com/DO/ensyu3_class2.pdf 38
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