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//
// MIT license
// Copyright (C) 2024 Intel Corporation
// SPDX-License-Identifier: MIT
//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
#include "tsembd.hpp"
static void timestep_embedding_f32(
const float * timesteps, float * dst, const int nb1,
const int dim, const int max_period, const sycl::nd_item<3> &item_ct1) {
// item_ct1.get_group(1)(blockIDx.y): idx of timesteps->ne[0]
// item_ct1.get_group(2) (blockIDx.x): idx of ((dim + 1) / 2) / BLOCK_SIZE
int i = item_ct1.get_group(1);
int j = item_ct1.get_local_id(2) + item_ct1.get_group(2) * item_ct1.get_local_range(2);
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)sycl::native::exp(-(sycl::log((float)max_period)) * j / half);
float arg = timestep * freq;
embed_data[j] = sycl::cos(arg);
embed_data[j + half] = sycl::sin(arg);
}
static void timestep_embedding_f32_sycl(
const float * x, float * dst, const int ne00, const int nb1,
const int dim, const int max_period, const queue_ptr& stream) {
// As the kernel returns when thread.idx is larger than dim/2, the half_ceil does not need to pad
int half_ceil = dim / 2;
int num_blocks = (half_ceil + SYCL_TIMESTEP_EMBEDDING_BLOCK_SIZE - 1) / SYCL_TIMESTEP_EMBEDDING_BLOCK_SIZE;
sycl::range<3> block_dims(1, 1, SYCL_TIMESTEP_EMBEDDING_BLOCK_SIZE);
sycl::range<3> gridDim(1, ne00, num_blocks);
stream->parallel_for(
sycl::nd_range<3>(
gridDim * block_dims, block_dims),
[=](sycl::nd_item<3> item_ct1) {
timestep_embedding_f32(
x, dst, nb1, dim, max_period, item_ct1
);
});
}
void ggml_sycl_op_timestep_embedding(ggml_backend_sycl_context & ctx, const ggml_tensor *src0,
const ggml_tensor *src1, ggml_tensor * dst) {
const float * src0_d = (const float *)src0->data;
float * dst_d = (float *)dst->data;
dpct::queue_ptr 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_sycl(src0_d, dst_d, src0->ne[0], dst->nb[1], dim, max_period, stream);
}
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