UGC NET CSE | December 2012 | Part 3 | Question: 19

Question

Identify the following activation function:

$\Phi (V) = Z +\frac{1}{1+ exp(-x*V+Y)}$, Z, X, Y are parameters.

• A. Step function
• B. Ramp function
• C. Sigmoid function
• D. Gaussian function

Answer 1

ans is C    Sigmoid functin (or logistics function)

refer https://en.wikipedia.org/wiki/Logistic_function

where

• e = the natural logarithm base (also known as Euler's number),
• x₀ = the x-value of the sigmoid's midpoint,
• L = the curve's maximum value, and
• k = the steepness of the curve.^[1
• The standard logistic function is the logistic function with parameters (k = 1, x₀ = 0, L = 1) which yields
• 

Comments

Sir, from which subject and topic it is? Also the function shown in question is different from the function shown in your answer

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the topic is from neural networks(AI) not meant for GATE but only for NET , for  more details u may refer link given

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Thanks Sir... My other concern was that function given in question is different from the function in ur answer