Slide 58
Slide 58 text
3-3. ϕΠζϩδεςΟοΫճؼ
࣍ϩδεςΟοΫճؼΛϕΠζతʹѻ͏͜ͱΛߟ͑Δɻ
ճؼͰٞͨ͠ͱ͓ΓɺϕΠζਪఆͰະͷೖྗ x ʹର͢Δग़ྗ t
ͷ༧ଌ p(t|x, t, X) ΛٻΊΔ͜ͱ͕తͱͳΔɻ
(1.32) ΑΓɺͦͷ༧ଌ p(t|x, t, X) ॏΈ w ͷੵͰҎԼͷΑ͏ʹ
͔͚Δɻ
p(t|x, t, X) =
∫
p(t|x, w)p(w|t, X) dw (3.11)
͜͜Ͱɺp(t|x, w) ؔͰ͋Γɺp(w|t, X) ύϥϝʔλͷࣄޙ
Ͱ͋Δɻ
ಛʹࠓճೋྨΛߟ͍͑ͯΔͷͰɺ֬
p(C1
|x, t, X) =
∫
p(C1
|x, w)p(w|t, X) dw (3.12)
͚ͩΛੵͯ͠ٻΊͯɺp(C2
|x, t, X)
p(C2
|x, t, X) = 1 − p(C1
|x, t, X) (3.13)
ͷΑ͏ʹن֨Խ͔݅ΒٻΊΔ͜ͱΛߟ͑Δɻ
58 / 74