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iq3_s_mult: quantization tuning

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This commit is contained in:
Iwan Kawrakow 2024-03-03 07:51:20 +02:00
parent 3000e0ac9e
commit fe3c20b251
1 changed files with 4 additions and 13 deletions
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17
ggml-quants.c
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@ -11986,9 +11986,10 @@ static void quantize_row_iq3_s_impl(int block_size, const float * restrict x, vo
scales[ib] = 0;
continue;
}
for (int k = 0; k < bs4; ++k) is_on_grid[k] = false;
float best = 0;
float scale = max/(2*kMaxQ-1);
for (int is = -15; is <= 15; ++is) {
for (int is = -9; is <= 9; ++is) {
float id = (2*kMaxQ-1+is*0.2f)/max;
float this_scale = 1/id;
for (int k = 0; k < bs4; ++k) {
@ -12024,7 +12025,7 @@ static void quantize_row_iq3_s_impl(int block_size, const float * restrict x, vo
if (n_not_ongrid > 0 && scale > 0) {
float id = 1/scale;
for (int k = 0; k < bs4; ++k) {
if (is_on_grid[k]) continue;
//if (is_on_grid[k]) continue;
uint16_t u = 0;
for (int i = 0; i < 4; ++i) {
int l = nearest_int(0.5f*(id*xval[4*k+i]-1));
@ -12074,24 +12075,14 @@ static void quantize_row_iq3_s_impl(int block_size, const float * restrict x, vo
scales[ib] = scale;
max_scale = MAX(max_scale, scale);
//for (int k = 0; k < bs8; ++k) {
// for (int i = 0; i < 8; ++i) {
// float diff = scale*(2*L[8*k+i] + 1) * (block_signs[k] & (1 << i) ? -1 : 1) - xb[8*k+i];
// block_mse += diff*diff;
// }
//}
}
//printf("Block %d: rmse = %g\n", ibl, (double)sqrtf(block_mse/QK_K));
if (!max_scale) {
continue;
}
float d = max_scale/31;
//y[ibl].d = GGML_FP32_TO_FP16(d * 1.025f); //1.02f); //1.0125f);
y[ibl].d = GGML_FP32_TO_FP16(d * 1.033f); //1.04f); //1.02f); //1.0125f);
y[ibl].d = GGML_FP32_TO_FP16(d * 1.025f); //1.033f);
float id = 1/d;
for (int ib = 0; ib < QK_K/block_size; ib += 2) {
int l1 = nearest_int(0.5f*(id*scales[ib+0]-1));