ikawrakow/ik_llama.cpp
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iq4_nl: faster quantization (#76)

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Co-authored-by: Iwan Kawrakow <iwan.kawrakow@gmail.com>
This commit is contained in:
Kawrakow
2024-10-02 08:17:00 +03:00
committed by GitHub
parent d2c74a369b
commit 6dec4112a1
1 changed files with 19 additions and 13 deletions
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32
ggml/src/ggml-quants.c
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@@ -14347,15 +14347,21 @@ size_t quantize_iq1_m(const float * restrict src, void * restrict dst, int64_t n
// ============================ 4-bit non-linear quants
static inline int best_index_int8(int n, const int8_t * val, float x) {
if (x <= val[0]) return 0;
if (x >= val[n-1]) return n-1;
int ml = 0, mu = n-1;
while (mu-ml > 1) {
int mav = (ml+mu)/2;
if (x < val[mav]) mu = mav; else ml = mav;
}
return x - val[mu-1] < val[mu] - x ? mu-1 : mu;
static const int8_t iq4nl_index[241] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
1, 17, 17, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 18, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3,
3, 3, 3, 3, 3, 3, 19, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 20, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5,
5, 5, 21, 21, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 22, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 23, 23, 8, 8, 8, 8,
8, 8, 8, 8, 8, 8, 24, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 25, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 26, 26,
11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 27, 27, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 28, 13, 13, 13,
13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 29, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14, 14,
14, 14, 14, 14, 30, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15
};
static inline int best_index_iq4nl(const int8_t * values, float x) {
int ix = (int)x - values[0];
if (ix < 0 || ix >= 241) return ix < 0 ? 0 : 15;
ix = iq4nl_index[ix];
return ix < 16 ? ix : x - values[ix-16] < values[ix-15] - x ? ix-16 : ix-15;
}
static void quantize_row_iq4_nl_impl(const int super_block_size, const int block_size, const float * restrict x,
@@ -14398,7 +14404,7 @@ static void quantize_row_iq4_nl_impl(const int super_block_size, const int block
float sumqx = 0, sumq2 = 0;
for (int j = 0; j < block_size; ++j) {
float al = id*xb[j];
int l = best_index_int8(16, values, al);
int l = best_index_iq4nl(values, al);
Lb[j] = l;
float q = values[l];
float w = weight[j];
@@ -14412,7 +14418,7 @@ static void quantize_row_iq4_nl_impl(const int super_block_size, const int block
sumqx = sumq2 = 0;
for (int j = 0; j < block_size; ++j) {
float al = id*xb[j];
int l = best_index_int8(16, values, al);
int l = best_index_iq4nl(values, al);
float q = values[l];
float w = weight[j];
sumqx += w*q*xb[j];
@@ -14443,7 +14449,7 @@ static void quantize_row_iq4_nl_impl(const int super_block_size, const int block
uint8_t * Lb = L + ib*block_size;
const float * xb = x + ib*block_size;
for (int j = 0; j < block_size; ++j) {
Lb[j] = best_index_int8(16, values, idl*xb[j]);
Lb[j] = best_index_iq4nl(values, idl*xb[j]);
}
l += 32;
uint8_t l_l = l & 0xf;
@@ -14457,7 +14463,7 @@ static void quantize_row_iq4_nl_impl(const int super_block_size, const int block
if (ntry > 0) {
float id = scales[0] ? 1/scales[0] : 0;
for (int j = 0; j < super_block_size; ++j) {
L[j] = best_index_int8(16, values, id*x[j]);
L[j] = best_index_iq4nl(values, id*x[j]);
}
}
}