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-   -   Clarification on Q4 (http://book.caltech.edu/bookforum/showthread.php?t=4325)

OlivierB 05-31-2013 01:44 PM

Clarification on Q4
 
What does "target distribution" mean exactly in the context of Q4 ? All other definitions are clear to me from the lectures & book, except this one.

In my understanding the target function is determined, fixed, and it has no 'probabilistic aspect', as maybe the 'distribution' term suggests.

I would like to know what 'Stochastic noise does not depend on the target distribution' means in detail ?

yaser 05-31-2013 04:03 PM

Re: Clarification on Q4
 
Quote:

Originally Posted by OlivierB (Post 10997)
What does "target distribution" mean exactly in the context of Q4 ? All other definitions are clear to me from the lectures & book, except this one.

In my understanding the target function is determined, fixed, and it has no 'probabilistic aspect', as maybe the 'distribution' term suggests.

I would like to know what 'Stochastic noise does not depend on the target distribution' means in detail ?

The target distribution describes the situation with noisy targets, where it is no longer a function but a function plus noise that is described by a distribution P(y|{\bf x}). You can look at slide 16 of Lecture 4 for details (in the Machine Learning Video Library, the relevant segment is http://work.caltech.edu/library/044.html).

OlivierB 06-01-2013 06:32 PM

Re: Clarification on Q4
 
Thank you for the clarification.
The sentence now does make sense to me, in the context of Q4.


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