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Deduplicate q4 quantization functions (#383)
* Deduplicate q4 quantization functions * Use const; add basic test * Re-enable quantization test * Disable AVX2 flags in CI --------- Co-authored-by: Georgi Gerganov <ggerganov@gmail.com>
This commit is contained in:
Stephan Walter
GitHub
parent
97940520e8
commit
69c92298a9
5 changed files with 119 additions and 113 deletions
2
.github/workflows/build.yml
vendored
2
.github/workflows/build.yml
vendored
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@ -89,7 +89,7 @@ jobs:
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run: |
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mkdir build
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cd build
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cmake ..
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cmake -DLLAMA_AVX2=OFF ..
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cmake --build . --config Release
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ctest --output-on-failure
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171
ggml.c
171
ggml.c
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@ -403,9 +403,55 @@ static inline __m128i packNibbles( __m256i bytes )
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// method 5
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// blocks of QK elements
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// represented with a single float (delta) and QK/2 8-bit ints (i.e QK 4-bit signed integer factors)
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// reference implementation for deterministic creation of model files
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static void quantize_row_q4_0_reference(const float * restrict x, void * restrict y, int k) {
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assert(k % QK == 0);
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const int nb = k / QK;
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const size_t bs = sizeof(float) + QK/2;
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uint8_t * restrict pd = ((uint8_t *)y + 0*bs);
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uint8_t * restrict pb = ((uint8_t *)y + 0*bs + sizeof(float));
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uint8_t pp[QK/2];
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for (int i = 0; i < nb; i++) {
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float amax = 0.0f; // absolute max
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for (int l = 0; l < QK; l++) {
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const float v = x[i*QK + l];
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amax = MAX(amax, fabsf(v));
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}
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const float d = amax / ((1 << 3) - 1);
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const float id = d ? 1.0f/d : 0.0f;
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*(float *)pd = d;
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pd += bs;
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for (int l = 0; l < QK; l += 2) {
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const float v0 = x[i*QK + l + 0]*id;
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const float v1 = x[i*QK + l + 1]*id;
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const uint8_t vi0 = ((int8_t) (round(v0))) + 8;
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const uint8_t vi1 = ((int8_t) (round(v1))) + 8;
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assert(vi0 >= 0 && vi0 < 16);
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assert(vi1 >= 0 && vi1 < 16);
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pp[l/2] = vi0 | (vi1 << 4);
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}
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memcpy(pb, pp, sizeof(pp));
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pb += bs;
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}
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}
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void quantize_row_q4_0(const float * restrict x, void * restrict y, int k) {
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assert(k % QK == 0);
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#if __ARM_NEON || defined(__AVX2__) || defined(__wasm_simd128__)
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const int nb = k / QK;
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const size_t bs = sizeof(float) + QK/2;
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@ -413,6 +459,7 @@ void quantize_row_q4_0(const float * restrict x, void * restrict y, int k) {
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uint8_t * restrict pb = ((uint8_t *)y + 0*bs + sizeof(float));
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uint8_t pp[QK/2];
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#endif
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#if __ARM_NEON
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#if QK == 32
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@ -569,36 +616,7 @@ void quantize_row_q4_0(const float * restrict x, void * restrict y, int k) {
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#endif
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#else
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// scalar
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for (int i = 0; i < nb; i++) {
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float amax = 0.0f; // absolute max
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for (int l = 0; l < QK; l++) {
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const float v = x[i*QK + l];
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amax = MAX(amax, fabsf(v));
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}
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const float d = amax / ((1 << 3) - 1);
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const float id = d ? 1.0f/d : 0.0f;
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*(float *)pd = d;
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pd += bs;
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for (int l = 0; l < QK; l += 2) {
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const float v0 = x[i*QK + l + 0]*id;
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const float v1 = x[i*QK + l + 1]*id;
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const uint8_t vi0 = ((int8_t) (round(v0))) + 8;
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const uint8_t vi1 = ((int8_t) (round(v1))) + 8;
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assert(vi0 >= 0 && vi0 < 16);
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assert(vi1 >= 0 && vi1 < 16);
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pp[l/2] = vi0 | (vi1 << 4);
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}
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memcpy(pb, pp, sizeof(pp));
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pb += bs;
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}
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quantize_row_q4_0_reference(x, y, k);
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#endif
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}
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@ -10705,119 +10723,60 @@ enum ggml_opt_result ggml_opt(
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////////////////////////////////////////////////////////////////////////////////
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size_t ggml_quantize_q4_0(float * src, void * dst, int n, int k, int qk, int64_t * hist) {
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size_t ggml_quantize_q4_0(const float * src, void * dst, int n, int k, int qk, int64_t * hist) {
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const int nb = k / qk;
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const size_t bs = (sizeof(float) + sizeof(uint8_t)*qk/2);
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const size_t row_size = nb*bs;
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assert(k % qk == 0);
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const size_t pp_size = qk / 2;
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uint8_t * pp = (uint8_t *) alloca(pp_size);
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char * pdst = (char *) dst;
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for (int j = 0; j < n; j += k) {
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uint8_t * pd = (uint8_t *) (pdst + (j/k)*row_size + 0*bs);
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uint8_t * pb = (uint8_t *) (pdst + (j/k)*row_size + 0*bs + sizeof(float));
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quantize_row_q4_0_reference(src + j, pd, k);
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for (int i = 0; i < nb; i++) {
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float amax = 0.0f; // absolute max
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for (int l = 0; l < qk; l += 2) {
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const uint8_t vi0 = pb[l/2] & 0xF;
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const uint8_t vi1 = pb[l/2] >> 4;
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{
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for (int l = 0; l < qk; l++) {
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const float v = src[j + i*qk + l];
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amax = MAX(amax, fabsf(v));
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}
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const float d = amax / ((1 << 3) - 1);
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const float id = d ? 1.0f/d : 0.0f;
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*(float *) pd = d;
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pd += bs;
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for (int l = 0; l < qk; l += 2) {
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const float v0 = (src[j + i*qk + l + 0])*id;
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const float v1 = (src[j + i*qk + l + 1])*id;
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const uint8_t vi0 = ((int8_t) (round(v0))) + 8;
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const uint8_t vi1 = ((int8_t) (round(v1))) + 8;
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assert(vi0 >= 0 && vi0 < 16);
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assert(vi1 >= 0 && vi1 < 16);
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hist[vi0]++;
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hist[vi1]++;
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pp[l/2] = vi0 | (vi1 << 4);
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}
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memcpy(pb, pp, pp_size);
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pb += bs;
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hist[vi0]++;
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hist[vi1]++;
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}
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pb += bs;
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}
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}
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return (n/k)*row_size;
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}
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size_t ggml_quantize_q4_1(float * src, void * dst, int n, int k, int qk, int64_t * hist) {
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size_t ggml_quantize_q4_1(const float * src, void * dst, int n, int k, int qk, int64_t * hist) {
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const int nb = k / qk;
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const size_t bs = (2*sizeof(float) + sizeof(uint8_t)*qk/2);
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const size_t row_size = nb*bs;
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assert(k % qk == 0);
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const size_t pp_size = qk / 2;
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uint8_t * pp = (uint8_t *) alloca(pp_size);
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char * pdst = (char *) dst;
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for (int j = 0; j < n; j += k) {
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uint8_t * pd = (uint8_t *) (pdst + (j/k)*row_size + 0*bs);
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uint8_t * pm = (uint8_t *) (pdst + (j/k)*row_size + 0*bs + sizeof(float));
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uint8_t * pb = (uint8_t *) (pdst + (j/k)*row_size + 0*bs + 2*sizeof(float));
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//printf("n = %d, k = %d, nb = %d, row_size = %d, j = %d, pm = %p, pd = %p, pb = %p\n", n, k, nb, row_size, j, pm, pd, pb);
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quantize_row_q4_1(src + j, pd, k);
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for (int i = 0; i < nb; i++) {
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float min = FLT_MAX;
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float max = -FLT_MAX;
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for (int l = 0; l < qk; l += 2) {
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const uint8_t vi0 = pb[l/2] & 0xF;
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const uint8_t vi1 = pb[l/2] >> 4;
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{
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for (int l = 0; l < qk; l++) {
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const float v = src[j + i*qk + l];
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if (v < min) min = v;
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if (v > max) max = v;
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}
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const float d = (max - min) / ((1 << 4) - 1);
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const float id = d ? 1.0f/d : 0.0f;
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*(float *) pd = d;
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*(float *) pm = min;
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pd += bs;
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pm += bs;
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for (int l = 0; l < qk; l += 2) {
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const float v0 = (src[j + i*qk + l + 0] - min)*id;
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const float v1 = (src[j + i*qk + l + 1] - min)*id;
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const uint8_t vi0 = round(v0);
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const uint8_t vi1 = round(v1);
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assert(vi0 >= 0 && vi0 < 16);
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assert(vi1 >= 0 && vi1 < 16);
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hist[vi0]++;
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hist[vi1]++;
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pp[l/2] = vi0 | (vi1 << 4);
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}
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memcpy(pb, pp, pp_size);
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pb += bs;
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hist[vi0]++;
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hist[vi1]++;
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}
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pb += bs;
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}
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}
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4
ggml.h
4
ggml.h
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@ -745,8 +745,8 @@ enum ggml_opt_result ggml_opt(
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// quantization
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//
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size_t ggml_quantize_q4_0(float * src, void * dst, int n, int k, int qk, int64_t * hist);
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size_t ggml_quantize_q4_1(float * src, void * dst, int n, int k, int qk, int64_t * hist);
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size_t ggml_quantize_q4_0(const float * src, void * dst, int n, int k, int qk, int64_t * hist);
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size_t ggml_quantize_q4_1(const float * src, void * dst, int n, int k, int qk, int64_t * hist);
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//
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// system info
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@ -1,4 +1,9 @@
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set(TEST_TARGET test-tokenizer-0)
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add_executable(${TEST_TARGET} ${TEST_TARGET}.cpp)
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target_link_libraries(${TEST_TARGET} PRIVATE llama ggml utils)
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add_test(NAME ${TEST_TARGET} COMMAND $<TARGET_FILE:${TEST_TARGET}> ${CMAKE_CURRENT_SOURCE_DIR}/../models/ggml-vocab.bin)
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function(llama_add_test source)
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get_filename_component(TEST_TARGET ${source} NAME_WE)
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add_executable(${TEST_TARGET} ${source})
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target_link_libraries(${TEST_TARGET} PRIVATE llama ggml utils)
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add_test(NAME ${TEST_TARGET} COMMAND $<TARGET_FILE:${TEST_TARGET}> ${ARGN})
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endfunction()
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llama_add_test(test-quantize.c)
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llama_add_test(test-tokenizer-0.cpp ${CMAKE_CURRENT_SOURCE_DIR}/../models/ggml-vocab.bin)
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42
tests/test-quantize.c
Normal file
42
tests/test-quantize.c
Normal file
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@ -0,0 +1,42 @@
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#include "ggml.h"
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#undef NDEBUG
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#include <assert.h>
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#include <math.h>
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int main(void) {
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#define QK 32
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float src[QK];
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uint8_t dst[24];
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int64_t hist[16];
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for (int i = 0; i < QK; i++) {
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src[i] = (float)(i + 1);
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}
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size_t size = ggml_quantize_q4_0(src, dst, QK, QK, QK, hist);
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assert(size == 20);
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float max_result = ((float *)dst)[0];
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float max_expected = src[31] / ((1 << 3) - 1);
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assert(max_result == max_expected);
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for (int i = 0; i < QK; i++) {
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uint8_t q4_result = (i % 2) ? (dst[sizeof(float) + i/2] >> 4) : (dst[sizeof(float) + i/2] & 0xF);
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uint8_t q4_expected = roundf(src[i] / max_expected) + 8;
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assert(q4_result == q4_expected);
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}
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size = ggml_quantize_q4_1(src, dst, QK, QK, QK, hist);
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assert(size == 24);
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float delta_result = ((float *)dst)[0];
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float delta_expected = (src[31] - src[0]) / ((1 << 4) - 1);
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assert(delta_result == delta_expected);
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float min_result = ((float *)dst)[1];
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float min_expected = src[0];
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assert(min_result == min_expected);
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for (int i = 0; i < QK; i++) {
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uint8_t q4_result = (i % 2) ? (dst[sizeof(float)*2 + i/2] >> 4) : (dst[sizeof(float)*2 + i/2] & 0xF);
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uint8_t q4_expected = roundf((src[i] - min_expected) / delta_expected);
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assert(q4_result == q4_expected);
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}
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return 0;
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}
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