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ex-7: keep negative sign in perceptron weights

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This commit is contained in:
Michele Guerini Rocco 2020-06-01 20:33:09 +00:00
parent e3fcd83f37
commit ed73ea5c8b
3 changed files with 1 additions and 3 deletions
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2
ex-7/percep.c
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@ -85,8 +85,6 @@ gsl_vector *percep_train(
* comparison with other methods. * comparison with other methods.
*/ */
double norm = gsl_blas_dnrm2(w); double norm = gsl_blas_dnrm2(w);
if (gsl_vector_isneg(w))
norm = -norm;
gsl_vector_scale(w, 1/norm); gsl_vector_scale(w, 1/norm);
*cut = -bias/norm; *cut = -bias/norm;

2
ex-7/plot.py
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@ -25,7 +25,7 @@ scatter(*signal, edgecolor='xkcd:charcoal',
scatter(*noise, edgecolor='xkcd:charcoal', scatter(*noise, edgecolor='xkcd:charcoal',
c='xkcd:pale purple', label='noise') c='xkcd:pale purple', label='noise')
line(-20*w, 20*w, c='xkcd:midnight blue', label='projection') line(-20*w, 20*w, c='xkcd:midnight blue', label='projection')
line(w-10*v, w+10*v, c='xkcd:scarlet', label='cut') line(abs(w)-10*v, abs(w)+10*v, c='xkcd:scarlet', label='cut')
xlabel('x') xlabel('x')
ylabel('y') ylabel('y')
xlim(-1.5, 8) xlim(-1.5, 8)

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notes/images/7-percep-proj.pdf
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