Slide 15
Slide 15 text
ֶशͱ༧ଌʢ ్தܭࢉʣ
(4), (5), (6)
ͷ్தܭࢉɼҎԼͷΑ͏ʹͳΔɽ
ֶशσʔλ ͱςετσʔλ ಠཱͳͷͰɼ
͕ͨͬͯ͠ɼ༧ଌ ͷ ͱՁͰ͋Δɽ
ϕΠζͷఆཧΑΓɼ
ͱͳΔɽ྆ลΛରม͢Δͱɼ
ͱͳΔɽ
(4), (5), (6)
p(y*
|x*
, X, Y) =
p(y*
, x*
, X, Y)
p(x*
, X, Y)
{X, Y} {x*
, y*
}
p(y*
|x*
, X, Y) =
p(y*
, x*
)p(X, Y)
p(x*
)p(X, Y)
=
p(y*
, x*
)
p(x*
)
= p(y*
|x*
)
y*
p(y*
|x*
)
p(w|y*
, x*
) =
p(w)p(y*
, x*
|w)
p(y*
, x*
)
=
p(w)p(y*
|x*
, w)p(x*
)
p(y*
|x*
)p(x*
)
=
p(w)p(y*
|x*
, w)
p(y*
|x*
)
⇔ p(y*
|x*
) =
p(w)p(y*
|x*
, w)
p(w|y*
, x*
)
∝
p(y*
|x*
, w)
p(w|y*
, x*
)
log p(y*
|x*
) = log p(y*
|x*
, w) − log p(w|y*
, x*
)