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The following text is from Hal Daumé III's "A Course in Machine Learning" online text book (Page-41).

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I implemented the following:

Is the implementation correct?

D = 2;
MaxIter = 100;
w = zeros(1, D);    
b = 1;
for i=1:MaxIter    
    output = zeros(D,1);        
    for j=1:D   

        a = activ_func(product(x(j,:), w') + b);

        if product(y(j,1), a)>0
            output(j)  = a;

            delta = y(j) - output(j);

            inc = x(j,:) * (coeff  * delta);

            w(1, j) = w(1, j) + inc';

            b = b + y(j, 1);
        end
    end
end

w_ret = w;

I have a few confusions.

What does it mean by ya? Is it the multiplication of a scalar value of a and the entire vector y? Or, between a and the j-th element of y (given that the inner for loop uses j as the loop counter)?

Also, what does that Algorithm-6 do? It should be calling Algorithm-5 rather than. Right?

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  • \$\begingroup\$ You have not included information about activ_func, product, coeff and delta (maybe more, I stopped counting). Please include all the necessary information, it's not possible to help without it. \$\endgroup\$ – Stewie Griffin Jan 13 '17 at 10:49
  • \$\begingroup\$ This is not multiclass perceptron. \$\endgroup\$ – horcrux Jul 1 '17 at 12:01

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