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sunyouming10

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zaq123321

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sunyouming10(feixiaolin´ú·¢): ½ð±Ò+15 2014-11-30 06:46:26
What is $\theta_f$? Is it a constant? Does this cost function only have one variable, that is $n_i$?
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2Â¥2014-11-28 21:46:56
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sunyouming10

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ÒýÓûØÌû:
2Â¥: Originally posted by zaq123321 at 2014-11-28 21:46:56
What is $\theta_f$? Is it a constant? Does this cost function only have one variable, that is $n_i$?

yes£¬ $\theta_f$ is a constant and  $n_i$ is the unique variable;
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3Â¥2014-11-28 21:51:23
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zaq123321

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Does this problem transfer to consider the derivatives of 1/(1+exp(-x))? Is the webpage
http://en.wikipedia.org/wiki/Sigmoid_function

helpful?
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4Â¥2014-11-28 22:10:54
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sunyouming10

Òø³æ (ÕýʽдÊÖ)

ÒýÓûØÌû:
4Â¥: Originally posted by zaq123321 at 2014-11-28 22:10:54
Does this problem transfer to consider the derivatives of 1/(1+exp(-x))? Is the webpage
http://en.wikipedia.org/wiki/Sigmoid_function

helpful?

Thanks a lot, i have found this webpage before ;due to the expression of R_i is a little complex,the derivatives of my designed utility function is too much complex
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5Â¥2014-11-29 09:17:05
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