ggml : reuse quantum structs across backends (#5943)
* ggml : reuse quant blocks across backends ggml-ci * ggml : define helper constants only for CUDA and SYCL ggml-ci * ggml : define helper quantum constants for SYCL ggml-ci
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Georgi Gerganov
GitHub
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7 changed files with 470 additions and 881 deletions
246
ggml-quants.h
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ggml-quants.h
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@ -1,248 +1,12 @@
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#pragma once
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#define GGML_COMMON_DECL_C
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#include "ggml-common.h"
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#include "ggml.h"
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// GGML internal header
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#include "ggml-impl.h"
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#include <stdint.h>
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#include <stddef.h>
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#define QK4_0 32
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typedef struct {
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ggml_fp16_t d; // delta
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uint8_t qs[QK4_0 / 2]; // nibbles / quants
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} block_q4_0;
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static_assert(sizeof(block_q4_0) == sizeof(ggml_fp16_t) + QK4_0 / 2, "wrong q4_0 block size/padding");
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#define QK4_1 32
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typedef struct {
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ggml_fp16_t d; // delta
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ggml_fp16_t m; // min
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uint8_t qs[QK4_1 / 2]; // nibbles / quants
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} block_q4_1;
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static_assert(sizeof(block_q4_1) == 2 * sizeof(ggml_fp16_t) + QK4_1 / 2, "wrong q4_1 block size/padding");
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#define QK5_0 32
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typedef struct {
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ggml_fp16_t d; // delta
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uint8_t qh[4]; // 5-th bit of quants
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uint8_t qs[QK5_0 / 2]; // nibbles / quants
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} block_q5_0;
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static_assert(sizeof(block_q5_0) == sizeof(ggml_fp16_t) + sizeof(uint32_t) + QK5_0 / 2, "wrong q5_0 block size/padding");
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#define QK5_1 32
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typedef struct {
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ggml_fp16_t d; // delta
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ggml_fp16_t m; // min
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uint8_t qh[4]; // 5-th bit of quants
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uint8_t qs[QK5_1 / 2]; // nibbles / quants
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} block_q5_1;
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static_assert(sizeof(block_q5_1) == 2 * sizeof(ggml_fp16_t) + sizeof(uint32_t) + QK5_1 / 2, "wrong q5_1 block size/padding");
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#define QK8_0 32
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typedef struct {
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ggml_fp16_t d; // delta
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int8_t qs[QK8_0]; // quants
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} block_q8_0;
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static_assert(sizeof(block_q8_0) == sizeof(ggml_fp16_t) + QK8_0, "wrong q8_0 block size/padding");
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#define QK8_1 32
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typedef struct {
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float d; // delta
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float s; // d * sum(qs[i])
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int8_t qs[QK8_1]; // quants
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} block_q8_1;
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static_assert(sizeof(block_q8_1) == 2*sizeof(float) + QK8_1, "wrong q8_1 block size/padding");
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//
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// Super-block quantization structures
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//
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// Super-block size
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#ifdef GGML_QKK_64
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#define QK_K 64
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#define K_SCALE_SIZE 4
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#else
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#define QK_K 256
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#define K_SCALE_SIZE 12
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#endif
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// 2-bit quantization
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// weight is represented as x = a * q + b
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// 16 blocks of 16 elements each
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// Effectively 2.625 bits per weight
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typedef struct {
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uint8_t scales[QK_K/16]; // scales and mins, quantized with 4 bits
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uint8_t qs[QK_K/4]; // quants
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ggml_fp16_t d; // super-block scale for quantized scales
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ggml_fp16_t dmin; // super-block scale for quantized mins
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} block_q2_K;
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static_assert(sizeof(block_q2_K) == 2*sizeof(ggml_fp16_t) + QK_K/16 + QK_K/4, "wrong q2_K block size/padding");
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// 3-bit quantization
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// weight is represented as x = a * q
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// 16 blocks of 16 elements each
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// Effectively 3.4375 bits per weight
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#ifdef GGML_QKK_64
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typedef struct {
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uint8_t hmask[QK_K/8]; // quants - high bit
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uint8_t qs[QK_K/4]; // quants - low 2 bits
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uint8_t scales[2];
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ggml_fp16_t d; // super-block scale
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} block_q3_K;
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static_assert(sizeof(block_q3_K) == sizeof(ggml_fp16_t) + QK_K / 4 + QK_K / 8 + 2, "wrong q3_K block size/padding");
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#else
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typedef struct {
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uint8_t hmask[QK_K/8]; // quants - high bit
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uint8_t qs[QK_K/4]; // quants - low 2 bits
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uint8_t scales[12]; // scales, quantized with 6 bits
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ggml_fp16_t d; // super-block scale
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} block_q3_K;
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static_assert(sizeof(block_q3_K) == sizeof(ggml_fp16_t) + QK_K / 4 + QK_K / 8 + 12, "wrong q3_K block size/padding");
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#endif
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// 4-bit quantization
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// 8 blocks of 32 elements each
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// weight is represented as x = a * q + b
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// Effectively 4.5 bits per weight
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#ifdef GGML_QKK_64
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typedef struct {
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ggml_fp16_t d[2]; // super-block scales/mins
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uint8_t scales[2]; // 4-bit block scales/mins
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uint8_t qs[QK_K/2]; // 4--bit quants
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} block_q4_K;
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static_assert(sizeof(block_q4_K) == 2*sizeof(ggml_fp16_t) + QK_K/2 + 2, "wrong q4_K block size/padding");
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#else
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typedef struct {
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ggml_fp16_t d; // super-block scale for quantized scales
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ggml_fp16_t dmin; // super-block scale for quantized mins
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uint8_t scales[K_SCALE_SIZE]; // scales and mins, quantized with 6 bits
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uint8_t qs[QK_K/2]; // 4--bit quants
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} block_q4_K;
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static_assert(sizeof(block_q4_K) == 2*sizeof(ggml_fp16_t) + K_SCALE_SIZE + QK_K/2, "wrong q4_K block size/padding");
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#endif
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// 5-bit quantization
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// 8 blocks of 32 elements each
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// weight is represented as x = a * q + b
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// Effectively 5.5 bits per weight
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#ifdef GGML_QKK_64
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typedef struct {
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ggml_fp16_t d; // super-block scale
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int8_t scales[QK_K/16]; // 8-bit block scales
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uint8_t qh[QK_K/8]; // quants, high bit
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uint8_t qs[QK_K/2]; // quants, low 4 bits
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} block_q5_K;
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static_assert(sizeof(block_q5_K) == sizeof(ggml_fp16_t) + QK_K/2 + QK_K/8 + QK_K/16, "wrong q5_K block size/padding");
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#else
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typedef struct {
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ggml_fp16_t d; // super-block scale for quantized scales
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ggml_fp16_t dmin; // super-block scale for quantized mins
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uint8_t scales[K_SCALE_SIZE]; // scales and mins, quantized with 6 bits
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uint8_t qh[QK_K/8]; // quants, high bit
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uint8_t qs[QK_K/2]; // quants, low 4 bits
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} block_q5_K;
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static_assert(sizeof(block_q5_K) == 2*sizeof(ggml_fp16_t) + K_SCALE_SIZE + QK_K/2 + QK_K/8, "wrong q5_K block size/padding");
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#endif
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// 6-bit quantization
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// weight is represented as x = a * q
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// 16 blocks of 16 elements each
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// Effectively 6.5625 bits per weight
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typedef struct {
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uint8_t ql[QK_K/2]; // quants, lower 4 bits
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uint8_t qh[QK_K/4]; // quants, upper 2 bits
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int8_t scales[QK_K/16]; // scales, quantized with 8 bits
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ggml_fp16_t d; // super-block scale
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} block_q6_K;
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static_assert(sizeof(block_q6_K) == sizeof(ggml_fp16_t) + QK_K / 16 + 3*QK_K/4, "wrong q6_K block size/padding");
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// This is only used for intermediate quantization and dot products
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typedef struct {
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float d; // delta
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int8_t qs[QK_K]; // quants
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int16_t bsums[QK_K/16]; // sum of quants in groups of 16
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} block_q8_K;
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static_assert(sizeof(block_q8_K) == sizeof(float) + QK_K + QK_K/16*sizeof(int16_t), "wrong q8_K block size/padding");
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// (Almost) "true" 2-bit quantization.
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// Due to the need to use blocks as per ggml design, it ends up using
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// 2.0625 bpw because of the 16-bit scale for each block of 256.
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typedef struct {
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ggml_fp16_t d;
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uint16_t qs[QK_K/8];
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} block_iq2_xxs;
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static_assert(sizeof(block_iq2_xxs) == sizeof(ggml_fp16_t) + QK_K/8*sizeof(uint16_t), "wrong iq2_xxs block size/padding");
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// 2.3125 bpw quants
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typedef struct {
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ggml_fp16_t d;
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uint16_t qs[QK_K/8];
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uint8_t scales[QK_K/32];
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} block_iq2_xs;
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static_assert(sizeof(block_iq2_xs) == sizeof(ggml_fp16_t) + QK_K/8*sizeof(uint16_t) + QK_K/32, "wrong iq2_xs block size/padding");
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// 2.5625 bpw quants
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typedef struct {
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ggml_fp16_t d;
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uint8_t qs[QK_K/4];
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uint8_t qh[QK_K/32];
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uint8_t scales[QK_K/32];
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} block_iq2_s;
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static_assert(sizeof(block_iq2_s) == sizeof(ggml_fp16_t) + QK_K/4 + QK_K/16, "wrong iq2_s block size/padding");
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// (Almost) "true" 3-bit quantization.
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// Due to the need to use blocks as per ggml design, it ends up using
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// 3.0625 bpw because of the 16-bit scale for each block of 256.
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typedef struct {
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ggml_fp16_t d;
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uint8_t qs[3*QK_K/8];
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} block_iq3_xxs;
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static_assert(sizeof(block_iq3_xxs) == sizeof(ggml_fp16_t) + 3*(QK_K/8), "wrong iq3_xxs block size/padding");
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// 3.4375 bpw
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#if QK_K == 64
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#define IQ3S_N_SCALE 2
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#else
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#define IQ3S_N_SCALE QK_K/64
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#endif
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typedef struct {
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ggml_fp16_t d;
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uint8_t qs[QK_K/4];
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uint8_t qh[QK_K/32];
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uint8_t signs[QK_K/8];
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uint8_t scales[IQ3S_N_SCALE];
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} block_iq3_s;
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static_assert(sizeof(block_iq3_s) == sizeof(ggml_fp16_t) + 13*(QK_K/32) + IQ3S_N_SCALE, "wrong iq3_s block size/padding");
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typedef struct {
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ggml_fp16_t d;
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uint8_t qs[QK_K/8];
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uint16_t qh[QK_K/32];
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} block_iq1_s;
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static_assert(sizeof(block_iq1_s) == sizeof(ggml_fp16_t) + QK_K/8 + QK_K/16, "wrong iq1_s block size/padding");
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// Non-linear quants
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#define QK4_NL 32
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typedef struct {
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ggml_fp16_t d;
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uint8_t qs[QK4_NL/2];
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} block_iq4_nl;
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static_assert(sizeof(block_iq4_nl) == sizeof(ggml_fp16_t) + QK4_NL/2, "wrong iq4_nl block size/padding");
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#if QK_K == 64
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#define block_iq4_xs block_iq4_nl
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//typedef struct block_iq4_nl block_iq4_xs;
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#else
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typedef struct {
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ggml_fp16_t d;
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uint16_t scales_h;
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uint8_t scales_l[QK_K/64];
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uint8_t qs[QK_K/2];
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} block_iq4_xs;
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static_assert(sizeof(block_iq4_xs) == sizeof(ggml_fp16_t) + sizeof(uint16_t) + QK_K/64 + QK_K/2, "wrong iq4_xs block size/padding");
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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