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cuda : deduplicated dequantization code (#1453)

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Johannes Gäßler 2023-05-14 20:53:23 +02:00 committed by GitHub
parent 79b2d5b69d
commit eb363627fd
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1 changed files with 33 additions and 121 deletions
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ggml-cuda.cu
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@ -83,7 +83,8 @@ typedef struct {
} block_q8_0; } block_q8_0;
static_assert(sizeof(block_q8_0) == sizeof(float) + QK8_0, "wrong q8_0 block size/padding"); static_assert(sizeof(block_q8_0) == sizeof(float) + QK8_0, "wrong q8_0 block size/padding");
#define CUDA_DMMV_BLOCK_SIZE 32 #define CUDA_DEQUANTIZE_BLOCK_SIZE 256
#define CUDA_DMMV_BLOCK_SIZE 32 // dmmv = dequantize_mul_mat_vec
static __device__ void dequantize_q4_0(const void * vx, const int ib, const int iqs, float & v0, float & v1){ static __device__ void dequantize_q4_0(const void * vx, const int ib, const int iqs, float & v0, float & v1){
const block_q4_0 * x = (const block_q4_0 *) vx; const block_q4_0 * x = (const block_q4_0 *) vx;
@ -170,104 +171,23 @@ static __device__ void convert_f16(const void * vx, const int ib, const int iqs,
v1 = __half2float(x[ib + 1]); v1 = __half2float(x[ib + 1]);
} }
static __global__ void dequantize_block_q4_0(const void * vx, float * y) { template <int qk, int qr, dequantize_kernel_t dequantize_kernel>
static const int qk = QK4_0; static __global__ void dequantize_block(const void * vx, float * y, const int k) {
const int i = blockDim.x*blockIdx.x + 2*threadIdx.x;
const block_q4_0 * x = (const block_q4_0 *) vx; if (i >= k) {
return;
const int i = blockIdx.x;
const float d = x[i].d;
for (int j = 0; j < qk/2; ++j) {
const int x0 = (x[i].qs[j] & 0xf) - 8;
const int x1 = (x[i].qs[j] >> 4) - 8;
y[i*qk + j + 0 ] = x0*d;
y[i*qk + j + qk/2] = x1*d;
} }
}
static __global__ void dequantize_block_q4_1(const void * vx, float * y) { const int ib = i/qk; // block index
static const int qk = QK4_1; const int iqs = (i%qk)/qr; // quant index
const int iybs = i - i%qk; // y block start index
const int y_offset = qr == 1 ? 1 : qk/2;
const block_q4_1 * x = (const block_q4_1 *) vx; // dequantize
float & v0 = y[iybs + iqs + 0];
const int i = blockIdx.x; float & v1 = y[iybs + iqs + y_offset];
dequantize_kernel(vx, ib, iqs, v0, v1);
const float d = x[i].d;
const float m = x[i].m;
for (int j = 0; j < qk/2; ++j) {
const int x0 = (x[i].qs[j] & 0xf);
const int x1 = (x[i].qs[j] >> 4);
y[i*qk + j + 0 ] = x0*d + m;
y[i*qk + j + qk/2] = x1*d + m;
}
}
static __global__ void dequantize_block_q5_0(const void * vx, float * y) {
static const int qk = QK5_0;
const block_q5_0 * x = (const block_q5_0 *) vx;
const int i = blockIdx.x;
const float d = x[i].d;
uint32_t qh;
memcpy(&qh, x[i].qh, sizeof(qh));
for (int j = 0; j < qk/2; ++j) {
const uint8_t xh_0 = ((qh >> (j + 0)) << 4) & 0x10;
const uint8_t xh_1 = ((qh >> (j + 12)) ) & 0x10;
const int32_t x0 = ((x[i].qs[j] & 0xf) | xh_0) - 16;
const int32_t x1 = ((x[i].qs[j] >> 4) | xh_1) - 16;
y[i*qk + j + 0 ] = x0*d;
y[i*qk + j + qk/2] = x1*d;
}
}
static __global__ void dequantize_block_q5_1(const void * vx, float * y) {
static const int qk = QK5_1;
const block_q5_1 * x = (const block_q5_1 *) vx;
const int i = blockIdx.x;
const float d = x[i].d;
const float m = x[i].m;
uint32_t qh;
memcpy(&qh, x[i].qh, sizeof(qh));
for (int j = 0; j < qk/2; ++j) {
const uint8_t xh_0 = ((qh >> (j + 0)) << 4) & 0x10;
const uint8_t xh_1 = ((qh >> (j + 12)) ) & 0x10;
const int x0 = (x[i].qs[j] & 0xf) | xh_0;
const int x1 = (x[i].qs[j] >> 4) | xh_1;
y[i*qk + j + 0 ] = x0*d + m;
y[i*qk + j + qk/2] = x1*d + m;
}
}
static __global__ void dequantize_block_q8_0(const void * vx, float * y) {
static const int qk = QK8_0;
const block_q8_0 * x = (const block_q8_0 *) vx;
const int i = blockIdx.x;
const float d = x[i].d;
for (int j = 0; j < qk; ++j) {
y[i*qk + j] = x[i].qs[j]*d;
}
} }
template <int block_size, int qk, int qr, dequantize_kernel_t dequantize_kernel> template <int block_size, int qk, int qr, dequantize_kernel_t dequantize_kernel>
@ -308,29 +228,29 @@ static __global__ void dequantize_mul_mat_vec(const void * vx, const float * y,
} }
} }
static void dequantize_row_q4_0_cuda(const void * vx, float * y, int k, cudaStream_t stream) { static void dequantize_row_q4_0_cuda(const void * vx, float * y, const int k, cudaStream_t stream) {
const int nb = k / QK4_0; const int num_blocks = (k + CUDA_DEQUANTIZE_BLOCK_SIZE - 1) / CUDA_DEQUANTIZE_BLOCK_SIZE;
dequantize_block_q4_0<<<nb, 1, 0, stream>>>(vx, y); dequantize_block<QK4_0, QR4_0, dequantize_q4_0><<<num_blocks, CUDA_DEQUANTIZE_BLOCK_SIZE, 0, stream>>>(vx, y, k);
} }
static void dequantize_row_q4_1_cuda(const void * vx, float * y, int k, cudaStream_t stream) { static void dequantize_row_q4_1_cuda(const void * vx, float * y, const int k, cudaStream_t stream) {
const int nb = k / QK4_1; const int num_blocks = (k + CUDA_DEQUANTIZE_BLOCK_SIZE - 1) / CUDA_DEQUANTIZE_BLOCK_SIZE;
dequantize_block_q4_1<<<nb, 1, 0, stream>>>(vx, y); dequantize_block<QK4_1, QR4_1, dequantize_q4_1><<<num_blocks, CUDA_DEQUANTIZE_BLOCK_SIZE, 0, stream>>>(vx, y, k);
} }
static void dequantize_row_q5_0_cuda(const void * vx, float * y, int k, cudaStream_t stream) { static void dequantize_row_q5_0_cuda(const void * vx, float * y, const int k, cudaStream_t stream) {
const int nb = k / QK5_0; const int num_blocks = (k + CUDA_DEQUANTIZE_BLOCK_SIZE - 1) / CUDA_DEQUANTIZE_BLOCK_SIZE;
dequantize_block_q5_0<<<nb, 1, 0, stream>>>(vx, y); dequantize_block<QK5_0, QR5_0, dequantize_q5_0><<<num_blocks, CUDA_DEQUANTIZE_BLOCK_SIZE, 0, stream>>>(vx, y, k);
} }
static void dequantize_row_q5_1_cuda(const void * vx, float * y, int k, cudaStream_t stream) { static void dequantize_row_q5_1_cuda(const void * vx, float * y, const int k, cudaStream_t stream) {
const int nb = k / QK5_1; const int num_blocks = (k + CUDA_DEQUANTIZE_BLOCK_SIZE - 1) / CUDA_DEQUANTIZE_BLOCK_SIZE;
dequantize_block_q5_1<<<nb, 1, 0, stream>>>(vx, y); dequantize_block<QK5_1, QR5_1, dequantize_q5_1><<<num_blocks, CUDA_DEQUANTIZE_BLOCK_SIZE, 0, stream>>>(vx, y, k);
} }
static void dequantize_row_q8_0_cuda(const void * vx, float * y, int k, cudaStream_t stream) { static void dequantize_row_q8_0_cuda(const void * vx, float * y, const int k, cudaStream_t stream) {
const int nb = k / QK8_0; const int num_blocks = (k + CUDA_DEQUANTIZE_BLOCK_SIZE - 1) / CUDA_DEQUANTIZE_BLOCK_SIZE;
dequantize_block_q8_0<<<nb, 1, 0, stream>>>(vx, y); dequantize_block<QK8_0, QR8_0, dequantize_q8_0><<<num_blocks, CUDA_DEQUANTIZE_BLOCK_SIZE, 0, stream>>>(vx, y, k);
} }
static void dequantize_mul_mat_vec_q4_0_cuda(const void * vx, const float * y, float * dst, const int ncols, const int nrows, cudaStream_t stream) { static void dequantize_mul_mat_vec_q4_0_cuda(const void * vx, const float * y, float * dst, const int ncols, const int nrows, cudaStream_t stream) {
@ -363,17 +283,9 @@ static void dequantize_mul_mat_vec_q8_0_cuda(const void * vx, const float * y, f
<<<nrows, CUDA_DMMV_BLOCK_SIZE, 0, stream>>>(vx, y, dst, ncols); <<<nrows, CUDA_DMMV_BLOCK_SIZE, 0, stream>>>(vx, y, dst, ncols);
} }
// TODO: optimize static void convert_fp16_to_fp32_cuda(const void * vx, float * y, const int k, cudaStream_t stream) {
static __global__ void convert_fp16_to_fp32(const void * vx, float * y) { const int num_blocks = (k + CUDA_DEQUANTIZE_BLOCK_SIZE - 1) / CUDA_DEQUANTIZE_BLOCK_SIZE;
const half * x = (const half *) vx; dequantize_block<32, 1, convert_f16><<<num_blocks, CUDA_DEQUANTIZE_BLOCK_SIZE, 0, stream>>>(vx, y, k);
const int i = blockIdx.x;
y[i] = __half2float(x[i]);
}
static void convert_fp16_to_fp32_cuda(const void * x, float * y, int k, cudaStream_t stream) {
convert_fp16_to_fp32<<<k, 1, 0, stream>>>(x, y);
} }
static void convert_mul_mat_vec_f16_cuda(const void * vx, const float * y, float * dst, const int ncols, const int nrows, cudaStream_t stream) { static void convert_mul_mat_vec_f16_cuda(const void * vx, const float * y, float * dst, const int ncols, const int nrows, cudaStream_t stream) {