Sigmoid units-artificial intelligence, Computer Engineering

Assignment Help:

Sigmoid units - Artificial intelligence

Remember that the function inside units take as input the weighted sum, S, of the values coming from the units associated to it. The function inside sigmoid units calculates the following value that given a real-valued input S:

2090_Sigmoid units.png

Where e is the base of natural logarithms, e = 2.718...

When we plot the output from sigmoid units given several weighted sums as input, it seems remarkably like a step function:

 

841_Sigmoid units1.png

Certainly, getting a differentiable function which seems like the step function was the main point of the exercise. Definitely, not only is this function differentiable, but the derivative is fairly expressed simply in terms of the function itself:

1259_Sigmoid units2.png

Notice that the output values for the σ function range between but never make it to 1and 0. This is because e-S is never -ve, and the denominator of the fraction tends to 0 as S gets very large  in the -ve direction, and tends to 1 as it gets very large in the +ve direction. This tendency happens quickly: the middle ground between 0 and 1 is hardly ever seen because of the sharp (near) step in the function. Because of it seems like a step function, we may think of it firing and not-firing as in a perceptron: if a positive real is input, the output will normally be close to +1 and if a negative real is input the output will normally be close to -1.


Related Discussions:- Sigmoid units-artificial intelligence

Explain about cd-rom and dvd-rom, Q. Explain about CD-ROM and DVD-ROM? ...

Q. Explain about CD-ROM and DVD-ROM? Optical disks employ Laser Disk Technology that is the latest and most promising technology for high capacity secondary storage. Advent of

Show the importance of risc processors, Q. Show the Importance of RISC Proc...

Q. Show the Importance of RISC Processors? Reduced Instruction Set Computers recognize a comparatively limited number of instructions. One benefit of a reduced instruction set

Explain extranet, Extranet : Extranet is Extension of an Intranet that ...

Extranet : Extranet is Extension of an Intranet that makes the latter accessible to outside companies or individuals with or without an intranet. It is also described as a coll

Evolutionary approaches boil down - artificial intelligence, Evolutionary a...

Evolutionary approaches boil down - artificial intelligence: In fact as we will see whether evolutionary approaches boil down to like (i) just to identify how to represent pos

Interpreted language and a compiled language, Difference between an interpr...

Difference between an interpreted language and a compiled language? Ans) A compiled language is written and then run by a compiler which checks its syntax and compresses it int

Term memory as used in a computer context initially, Term memory as used in...

Term memory as used in a computer context initially The term memory as used in a computer context initially referred to magnetic core memory devices which were used beginning

Determine the decimal equivalent of hexadecimal number, The hexadecimal num...

The hexadecimal number for (95.5) 10 is ? Ans. (95.5) 10 = (5F.8) 16 Integer part Fractional part 0.5x16=8.0

Build and evaluate a GAN based model using KERAS, I did not see an option r...

I did not see an option related to machine learning. so i selected computer engineering. Use different datasets such as: paintings by Picasso, Van Gogh, DaVinci

Dbms, aggregation in dbms?

aggregation in dbms?

Loop statement in both the pbo and pai events, Why do we need to code a LOO...

Why do we need to code a LOOP statement in both the PBO and PAI events for each table in the screen? We require coding a LOOP statement in both PBO and PAI events for every ta

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd