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Taichi Aida
March 21, 2019
Technology
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ロジスティック回帰
Taichi Aida
March 21, 2019
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Transcript
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• 7 3 • • •
7 7 2
• 4 3 • •
• • • • 5 • • •
• • • • • 6 • •
• 4 !" # • # 004 • $
1 004 2 • % • !" # = %# #'7 1 ,7 2 0 4 • %#' ≥ 0 $ = 1 • %#' < 0 $ = 0 • %
• • • • • • • 8
• 2 4 !" # • !" # =
1 1 + exp(−",#) 0 < !" # < 1 • 9 4
• 0 • • • • • 1 •
• 1 ! "#$ % &(((") = 1|-).(/)&(((") =
0|-)$1.(/) • • ((") = 1 &(((") = 0|-)$1.(/) = 1 • ((") = 0 &(((") = 1|-).(/) = 1
• • • • • 2 • 1 •
• • !(#) 3 1 ! #
= & '() * +(,(') = 1|/)0(1)+(,(') = 0|/))30(1) • 3 log! # = 7 '() * ,(')log+ ,(') = 1 / + (1 − ,('))log+(,(') = 0|/) • 3 3 3
• !" # = %('(() = 1|#)
1 ,- .log2 , .,- = 3 (45 6 '(() − !" # 8- • 1 14 ,- ≔ ,- − : 3 (45 6 !" # − '(() 8- • : • ≔
• !" # = %('(() = 1|#)
1 ,- .log2 , .,- = 3 (45 6 '(() − !" # 8- • 2 ,- ≔ ,- − : 3 (45 6 !" # − '(() 8- • : • ≔ 5 !" # = %('(() = 1|#)2 % ' ( = 0 # = 1 − !" # <=>?@ A <AB = <=>?@ A <C" # <C" # <AB
• • • • 6 • • 1 •
• l T ! h m A "# n
r • !$"# ≥ 0 d ' = 1 • !$"# < 0 d ' = 0 • o c T • ! g_k • ep • a bi 0::7 /1:0 1 01 1- 3 :.8 0 7 7