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#include "tsembd.cuh"
static __global__ void timestep_embedding_f32(const float * timesteps, float * dst, const int nb1, const int dim, const int max_period) {
// blockIDx.y: idx of timesteps->ne[0]
// blockIDx.x: idx of ((dim + 1) / 2) / BLOCK_SIZE
int i = blockIdx.y;
int j = threadIdx.x + blockIdx.x * blockDim.x;
float * embed_data = (float *)((char *)dst + i*nb1);
if (dim % 2 != 0 && j == ((dim + 1) / 2)) {
embed_data[dim] = 0.f;
}
int half = dim / 2;
if (j >= half) {
return;
}
float timestep = timesteps[i];
float freq = (float)expf(-logf(max_period) * j / half);
float arg = timestep * freq;
embed_data[j] = cosf(arg);
embed_data[j + half] = sinf(arg);
}
static void timestep_embedding_f32_cuda(const float * x, float * dst, const int ne00, const int nb1,
const int dim, const int max_period, cudaStream_t stream) {
int half_ceil = (dim + 1) / 2;
int num_blocks = (half_ceil + CUDA_TIMESTEP_EMBEDDING_BLOCK_SIZE - 1) / CUDA_TIMESTEP_EMBEDDING_BLOCK_SIZE;
dim3 gridDim(num_blocks, ne00, 1);
timestep_embedding_f32<<<gridDim, CUDA_TIMESTEP_EMBEDDING_BLOCK_SIZE, 0, stream>>>(x, dst, nb1, dim, max_period);
}
void ggml_cuda_op_timestep_embedding(ggml_backend_cuda_context & ctx, ggml_tensor * dst) {
const ggml_tensor * src0 = dst->src[0];
const float * src0_d = (const float *)src0->data;
float * dst_d = (float *)dst->data;
cudaStream_t stream = ctx.stream();
GGML_ASSERT(src0->type == GGML_TYPE_F32);
GGML_ASSERT(dst->type == GGML_TYPE_F32);
const int dim = dst->op_params[0];
const int max_period = dst->op_params[1];
timestep_embedding_f32_cuda(src0_d, dst_d, src0->ne[0], dst->nb[1], dim, max_period, stream);
}
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