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add function to randomly tweak the weights #50

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add function to randomly tweak the weights #50

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9 changes: 9 additions & 0 deletions genann.c
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Original file line number Diff line number Diff line change
Expand Up @@ -201,6 +201,15 @@ void genann_randomize(genann *ann) {
}
}

void genann_random_tweak(genann *ann, double max) {
int i;
for (i = 0; i < ann->total_weights; ++i) {
/* -max <= r <= max */
double r = (GENANN_RANDOM() - 0.5) * 2 * max;
ann->weight[i] += r;
}
}


void genann_free(genann *ann) {
/* The weight, output, and delta pointers go to the same buffer. */
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3 changes: 3 additions & 0 deletions genann.h
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Expand Up @@ -79,6 +79,9 @@ genann *genann_read(FILE *in);
/* Sets weights randomly. Called by init. */
void genann_randomize(genann *ann);

/* Modifies the weights randomly, with max as a threshold */
void genann_random_tweak(genann *ann, double max);

/* Returns a new copy of ann. */
genann *genann_copy(genann const *ann);

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