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Compare subcommand: report difference as %.

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antirez
2023-12-30 15:43:44 +01:00
parent 3663d73c22
commit 951ce0e3c4
1 changed files with 26 additions and 4 deletions
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30
gguf-tools.c
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@@ -376,8 +376,16 @@ void gguf_tools_inspect_weights(const char *filename, const char *tname, uint64_
/* ========================== 'compare' subcommand ========================== */
/* Given two tensors of the same length, return the average difference
* of their weights. Returns 1 on success, 0 if one or both the provided
* tensors can't be dequantized. */
* of their weights, in percentage.
*
* The difference is calculated like that: the average of the absolute values
* of all the weights in the two vectors is calculated. Then, for each set
* of corresponding weights, we calculate the difference, and the percentage
* according to the average value (100%). The function returns the average
* of the percentage of difference between all the pairs.
*
* Returns 1 on success, 0 if one or both the provided tensors can't be
* dequantized. */
int tensors_avg_diff(gguf_tensor *t1, gguf_tensor *t2, double *diff) {
float *weights1 = gguf_tensor_to_float(t1);
float *weights2 = gguf_tensor_to_float(t2);
@@ -387,12 +395,26 @@ int tensors_avg_diff(gguf_tensor *t1, gguf_tensor *t2, double *diff) {
return 0;
}
/* Compute the average magnitude of the weights. */
double tot_mag = 0;
for (uint64_t j = 0; j < t1->num_weights; j++) {
tot_mag += fabs(weights1[j]);
tot_mag += fabs(weights2[j]);
}
double avg_mag = tot_mag/(t1->num_weights*2);
/* Compute the average % difference of the weights. */
double tot_diff = 0;
for (uint64_t j = 0; j < t1->num_weights; j++)
tot_diff += fabs(weights1[j]-weights2[j]);
double avg_diff = tot_diff / t1->num_weights;
/* Multiply by 75 to normalize the difference of a
* random varialbe between -N and +N to 0 - 100% */
*diff = avg_diff / avg_mag * 75;
free(weights1);
free(weights2);
*diff = tot_diff/t1->num_weights;
return 1;
}
@@ -423,7 +445,7 @@ void gguf_tools_compare(const char *file1, const char *file2) {
} else {
double diff;
if (tensors_avg_diff(&tensor1, &tensor2, &diff)) {
printf("avg weights difference: %f\n", diff);
printf("avg weights difference: %f%%\n", diff);
} else {
printf("dequantization function missing...\n");
}