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Old 01-16-2013, 11:59 AM
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yaser yaser is offline
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Location: Pasadena, California, USA
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Default Re: Query regarding Noise Targets lecture 4

Originally Posted by ripande View Post
As per lecture 4 :- Slide 16/22

Noise target = Diterministic Target + Noise (This is clear)

However it then says :

Diterministic target f(x) = E(Y|X). Hence
y ( Noisy target) = E(Y|X) ( Diterministic target) + noise ( y-f(x) )

I do not understand the above statement. Did we not say that to accomodate for noisy targets we replace y = f(x) with a conditional distribution of y given x. Should then not the noisy target be defined by
E(Y|X) ?
The noisy target is y and indeed it is specified by P(y|{\bf x}). The equation decomposes the noisy target into a noiseless component plus a pure noise component.
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