# Feed Forward ANN Training using Back Propagation

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Warren on 12 May 2023
Commented: Warren on 7 Jun 2023
Find a new weights by using Matlab code, when shown below is presented the input pattern (1 2 3) and the target output is 1. Using learning rate of 0.2 and bipolar sigmoid activation function, the bias is set to1.
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### Answers (1)

Shaik on 13 May 2023
Hi,
Hope this resolves your issue
% Define the input pattern and target output
x = [1; 2; 3];
t = 1;
% Define the initial weights
w = randn(3, 1);
% Define the learning rate and bias
alpha = 0.2;
b = 1;
% Define the activation function
sigmoid = @(x) 2./(1+exp(-x)) - 1;
% Initialize the error and iteration counter
err = inf;
iter = 0;
% Loop until the error is small enough or a maximum number of iterations is reached
while err > 0.01 && iter < 1000
% Calculate the net input
net = w' * x + b;
% Calculate the output of the neuron using the bipolar sigmoid activation function
y = sigmoid(net);
% Calculate the error
e = t - y;
% Update the weights and bias
dw = alpha * e * x;
w = w + dw;
db = alpha * e;
b = b + db;
% Calculate the squared error
err = e^2;
% Increment the iteration counter
iter = iter + 1;
end
% Display the results
disp(['Final weights: ' num2str(w')]);
Final weights: 1.4659 -0.55741 1.9576
disp(['Final bias: ' num2str(b)]);
Final bias: 1.0003
disp(['Final output: ' num2str(y)]);
Final output: 0.99854
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John D'Errico on 31 May 2023
PLease don't do obvioius homework assignments for students who cannot bother to show an effort of their own. This does not help the student, as it teaches them nothing but that there is always someone willing to do their work for them. Why you want to do that, is up to you, but it is a bad idea for the student.
It does not help the site, because it teaches this student that they can now post addigntional questions, and get their homework assignment done for them.
It hurts the site because it also convinces other students they they too can spam the site with their homework assignments.
This was the third question this student posted, with no effort made. Do you expect them to learn anything more than to keep on posting their homework?
Warren on 7 Jun 2023
Well, dear, let's talk in general first. When I came to the site, I did not expect that I would get help because these questions are within artificial intelligence, while the brother helped me, and I am grateful for his efforts, but such questions are external and not among the sources of methodology (the purpose of human life is to help others) if you You cannot help others, at least try to be generous with your silence, because you are annoying when you act selfishly. All sites are also unable to solve it, because it is not within any source .. The goal was humanitarian assistance, but I do not know where the mistake is in that. I have benefited a lot .. and not least the site It is useful when the questions are within Matlab, ideas and new development, while when searching for such a question, one will resort to the site. I hope from the bottom of my heart that it will change for the better and cancel this selfishness. Thank you very much.

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