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Diffstat (limited to 'k_quants.h')
| -rw-r--r-- | k_quants.h | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/k_quants.h b/k_quants.h new file mode 100644 index 0000000..10a0baa --- /dev/null +++ b/k_quants.h @@ -0,0 +1,122 @@ +#pragma once + +#include "ggml.h" + +#include <stdint.h> +#include <assert.h> +#include <stddef.h> + +// Super-block size +#define QK_K 256 + +// +// Super-block quantization structures +// + +// 2-bit quantization +// weight is represented as x = a * q + b +// 16 blocks of 16 elemenets each +// Effectively 2.5625 bits per weight +typedef struct { + uint8_t scales[QK_K/16]; // scales and mins, quantized with 4 bits + uint8_t qs[QK_K/4]; // quants + ggml_fp16_t d; // super-block scale for quantized scales + ggml_fp16_t dmin; // super-block scale for quantized mins +} block_q2_K; +static_assert(sizeof(block_q2_K) == 2*sizeof(ggml_fp16_t) + QK_K/16 + QK_K/4, "wrong q2_K block size/padding"); + +// 3-bit quantization +// weight is represented as x = a * q +// 16 blocks of 16 elemenets each +// Effectively 3.4375 bits per weight +typedef struct { + uint8_t hmask[QK_K/8]; // quants - high bit + uint8_t qs[QK_K/4]; // quants - low 2 bits + uint8_t scales[3*QK_K/64]; // scales, quantized with 6 bits + ggml_fp16_t d; // super-block scale +} block_q3_K; +static_assert(sizeof(block_q3_K) == sizeof(ggml_fp16_t) + QK_K / 4 + 11 * QK_K / 64, "wrong q3_K block size/padding"); + +// 4-bit quantization +// 16 blocks of 32 elements each +// weight is represented as x = a * q + b +// Effectively 4.5 bits per weight +typedef struct { + ggml_fp16_t d; // super-block scale for quantized scales + ggml_fp16_t dmin; // super-block scale for quantized mins + uint8_t scales[3*QK_K/64]; // scales and mins, quantized with 6 bits + uint8_t qs[QK_K/2]; // 4--bit quants +} block_q4_K; +static_assert(sizeof(block_q4_K) == 2*sizeof(ggml_fp16_t) + 3*QK_K/64 + QK_K/2, "wrong q4_K block size/padding"); + +// 5-bit quantization +// 16 blocks of 32 elements each +// weight is represented as x = a * q + b +// Effectively 5.5 bits per weight +typedef struct { + ggml_fp16_t d; // super-block scale for quantized scales + ggml_fp16_t dmin; // super-block scale for quantized mins + uint8_t scales[3*QK_K/64]; // scales and mins, quantized with 6 bits + uint8_t qh[QK_K/8]; // quants, high bit + uint8_t qs[QK_K/2]; // quants, low 4 bits +} block_q5_K; +static_assert(sizeof(block_q5_K) == 2*sizeof(ggml_fp16_t) + 3*QK_K/64 + QK_K/2 + QK_K/8, "wrong q5_K block size/padding"); + +// 6-bit quantization +// weight is represented as x = a * q +// 16 blocks of 16 elemenets each +// Effectively 6.5625 bits per weight +typedef struct { + uint8_t ql[QK_K/2]; // quants, lower 4 bits + uint8_t qh[QK_K/4]; // quants, upper 2 bits + int8_t scales[QK_K/16]; // scales, quantized with 8 bits + ggml_fp16_t d; // super-block scale +} block_q6_K; +static_assert(sizeof(block_q6_K) == sizeof(ggml_fp16_t) + QK_K / 16 + 3*QK_K/4, "wrong q6_K block size/padding"); + +// This is only used for intermediate quantization and dot products +typedef struct { + float d; // delta + int8_t qs[QK_K]; // quants + int16_t bsums[QK_K/16]; // sum of quants in groups of 16 +} block_q8_K; +static_assert(sizeof(block_q8_K) == sizeof(float) + QK_K + QK_K/16*sizeof(int16_t), "wrong q8_K block size/padding"); + + +// Quantization +void quantize_row_q2_K_reference(const float * restrict x, block_q2_K * restrict y, int k); +void quantize_row_q3_K_reference(const float * restrict x, block_q3_K * restrict y, int k); +void quantize_row_q4_K_reference(const float * restrict x, block_q4_K * restrict y, int k); +void quantize_row_q5_K_reference(const float * restrict x, block_q5_K * restrict y, int k); +void quantize_row_q6_K_reference(const float * restrict x, block_q6_K * restrict y, int k); +void quantize_row_q8_K_reference(const float * restrict x, block_q8_K * restrict y, int k); + +void quantize_row_q2_K(const float * restrict x, void * restrict y, int k); +void quantize_row_q3_K(const float * restrict x, void * restrict y, int k); +void quantize_row_q4_K(const float * restrict x, void * restrict y, int k); +void quantize_row_q5_K(const float * restrict x, void * restrict y, int k); +void quantize_row_q6_K(const float * restrict x, void * restrict y, int k); +void quantize_row_q8_K(const float * restrict x, void * restrict y, int k); + +// Dequantization +void dequantize_row_q2_K(const block_q2_K * restrict x, float * restrict y, int k); +void dequantize_row_q3_K(const block_q3_K * restrict x, float * restrict y, int k); +void dequantize_row_q4_K(const block_q4_K * restrict x, float * restrict y, int k); +void dequantize_row_q5_K(const block_q5_K * restrict x, float * restrict y, int k); +void dequantize_row_q6_K(const block_q6_K * restrict x, float * restrict y, int k); +void dequantize_row_q8_K(const block_q8_K * restrict x, float * restrict y, int k); + +// Dot product +void ggml_vec_dot_q2_K_q8_K(int n, float * restrict s, const void * restrict vx, const void * restrict vy); +void ggml_vec_dot_q3_K_q8_K(int n, float * restrict s, const void * restrict vx, const void * restrict vy); +void ggml_vec_dot_q4_K_q8_K(int n, float * restrict s, const void * restrict vx, const void * restrict vy); +void ggml_vec_dot_q5_K_q8_K(int n, float * restrict s, const void * restrict vx, const void * restrict vy); +void ggml_vec_dot_q6_K_q8_K(int n, float * restrict s, const void * restrict vx, const void * restrict vy); + +// Quantization with histogram collection +size_t ggml_quantize_q2_K(const float * src, void * dst, int n, int k, int64_t * hist); +size_t ggml_quantize_q3_K(const float * src, void * dst, int n, int k, int64_t * hist); +size_t ggml_quantize_q4_K(const float * src, void * dst, int n, int k, int64_t * hist); +size_t ggml_quantize_q5_K(const float * src, void * dst, int n, int k, int64_t * hist); +size_t ggml_quantize_q6_K(const float * src, void * dst, int n, int k, int64_t * hist); + |