ea82b00e54
Sources (Apache 2.0, cloned 2026-08-09): - Deep-Spark/xllm: Iluvatar's official C++ inference engine - Deep-Spark/vllm: Iluvatar's vllm fork Key files for our EX Engine development: MoE topk_softmax (fixes 2304 calls/token PyTorch fallback): - xllm/kernels/cuda/moe/moe_topk_softmax_kernels.cuh CUB-based fused softmax+topk, power-of-2 expert count optimized For 64 experts: topk_gating_softmax<T,VPT=2,64,WARPS=4,BYTES=4> - xllm/kernels/ilu/ixformer.h Official ixformer C++ API: topk_softmax(), paged_attention(), etc. - xllm/kernels/ilu/fused_moe.cpp How xllm calls ixformer::infer::topk_softmax() - ds_vllm/csrc/moe/topk_softmax_kernels.cu vllm-native topk_softmax (TensorRT-LLM derived, 874 lines) GatedDeltaNet (fixes NaN in 4 GDN layers): - xllm/layers/npu_torch/qwen3_gated_delta_net_base.cpp fp32 state accumulation, proper recurrent update Complete FusedMoE pipeline reference: - xllm/layers/ilu/fused_moe.cpp gate -> topk -> expand -> gemm1 -> act -> gemm2 -> combine
190 lines
7.9 KiB
C++
190 lines
7.9 KiB
C++
/* Copyright 2025 The xLLM Authors. All Rights Reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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https://github.com/jd-opensource/xllm/blob/main/LICENSE
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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==============================================================================*/
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#include "attention.h"
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#include "kernels/ilu/ilu_ops_api.h"
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#include "kernels/ops_api.h"
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namespace xllm {
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namespace layer {
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AttentionImpl::AttentionImpl(int64_t num_heads,
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int64_t head_size,
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float scale,
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int64_t num_kv_heads,
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int64_t sliding_window)
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: num_heads_(num_heads),
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head_size_(head_size),
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scale_(scale),
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num_kv_heads_(num_kv_heads),
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v_head_dim_(head_size),
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use_fused_mla_qkv_(false),
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enable_lighting_indexer_(false),
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enable_mla_(false),
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sliding_window_(sliding_window) {
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if (sliding_window_ > -1) {
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sliding_window_ = sliding_window_ - 1;
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}
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}
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AttentionImpl::AttentionImpl(int64_t num_heads,
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int64_t head_size,
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int64_t num_kv_heads,
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int64_t v_head_dim,
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int64_t sliding_window,
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float scale,
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bool use_fused_mla_qkv,
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bool enable_lighting_indexer,
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bool enable_mla)
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: num_heads_(num_heads),
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head_size_(head_size),
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scale_(scale),
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num_kv_heads_(num_kv_heads),
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v_head_dim_(v_head_dim),
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use_fused_mla_qkv_(use_fused_mla_qkv),
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enable_lighting_indexer_(enable_lighting_indexer),
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enable_mla_(enable_mla),
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sliding_window_(sliding_window) {
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if (sliding_window_ > -1) {
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sliding_window_ = sliding_window_ - 1;
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}
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}
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std::tuple<torch::Tensor, std::optional<torch::Tensor>> AttentionImpl::forward(
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const AttentionMetadata& attn_metadata,
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torch::Tensor& query,
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torch::Tensor& key,
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torch::Tensor& value,
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KVCache& kv_cache) {
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std::optional<torch::Tensor> output_lse = std::nullopt;
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torch::Tensor output;
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if (enable_mla_) {
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output = torch::empty({query.size(0), num_heads_ * v_head_dim_},
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query.options());
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} else {
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output = torch::empty_like(query);
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}
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if (attn_metadata.is_dummy) {
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return std::make_tuple(output, output_lse);
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}
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bool only_prefill =
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attn_metadata.is_prefill || attn_metadata.is_chunked_prefill;
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int64_t num_kv_heads = (enable_mla_ && !only_prefill) ? 1 : num_kv_heads_;
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torch::Tensor k_cache = kv_cache.get_k_cache();
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std::optional<torch::Tensor> v_cache;
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std::optional<torch::Tensor> v;
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if (!enable_mla_) {
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v = value.view({-1, num_kv_heads, head_size_});
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v_cache = kv_cache.get_v_cache();
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}
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bool skip_process_cache = enable_mla_ && (only_prefill || use_fused_mla_qkv_);
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if (!skip_process_cache) {
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xllm::kernel::ReshapePagedCacheParams reshape_paged_cache_params;
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reshape_paged_cache_params.key = key.view({-1, num_kv_heads, head_size_});
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reshape_paged_cache_params.value = v;
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reshape_paged_cache_params.k_cache = k_cache;
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reshape_paged_cache_params.v_cache = v_cache;
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reshape_paged_cache_params.slot_mapping = attn_metadata.slot_mapping;
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xllm::kernel::reshape_paged_cache(reshape_paged_cache_params);
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}
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if (enable_lighting_indexer_ || !only_prefill) {
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decoder_forward(query, output, k_cache, v_cache, attn_metadata);
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} else {
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prefill_forward(query, key, value, output, k_cache, v_cache, attn_metadata);
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}
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int64_t head_size = enable_mla_ ? v_head_dim_ : head_size_;
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output = output.view({-1, num_heads_ * head_size});
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return {output, output_lse};
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}
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void AttentionImpl::prefill_forward(torch::Tensor& query,
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torch::Tensor& key,
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torch::Tensor& value,
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torch::Tensor& output,
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const torch::Tensor& k_cache,
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const std::optional<torch::Tensor>& v_cache,
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const AttentionMetadata& attn_metadata) {
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int64_t head_size_v = enable_mla_ ? v_head_dim_ : head_size_;
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std::optional<torch::Tensor> output_lse = std::nullopt;
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query = query.view({-1, num_heads_, head_size_});
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output = output.view({-1, num_heads_, head_size_v});
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// torch::Tensor k_cache_ = k_cache;
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// torch::Tensor v_cache_ = v_cache.value();
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xllm::kernel::ilu::batch_prefill(query,
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k_cache,
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v_cache,
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output,
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output_lse,
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attn_metadata.q_cu_seq_lens,
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attn_metadata.kv_cu_seq_lens,
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/*alibi_slope=*/std::nullopt,
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/*attn_bias=*/std::nullopt,
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/*q_quant_scale=*/std::nullopt,
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/*k_quant_scale=*/std::nullopt,
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/*v_quant_scale=*/std::nullopt,
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attn_metadata.block_table,
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attn_metadata.max_query_len,
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attn_metadata.max_seq_len,
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scale_,
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attn_metadata.is_causal,
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sliding_window_,
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/*window_size_right=*/-1,
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attn_metadata.compute_dtype,
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/*return_lse=*/false);
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}
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void AttentionImpl::decoder_forward(torch::Tensor& query,
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torch::Tensor& output,
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const torch::Tensor& k_cache,
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const std::optional<torch::Tensor>& v_cache,
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const AttentionMetadata& attn_metadata) {
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int64_t head_size_v = enable_mla_ ? v_head_dim_ : head_size_;
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query = query.view({-1, 1, num_heads_, head_size_});
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output = output.view({-1, 1, num_heads_, head_size_v});
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std::optional<torch::Tensor> output_lse = std::nullopt;
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int64_t block_aligned_max_seq_len =
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attn_metadata.block_table.size(-1) * k_cache.size(2);
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xllm::kernel::ilu::batch_decode(query,
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k_cache,
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output,
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attn_metadata.block_table,
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attn_metadata.kv_seq_lens,
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v_cache,
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output_lse,
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/*q_quant_scale=*/std::nullopt,
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/*k_quant_scale=*/std::nullopt,
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/*v_quant_scale=*/std::nullopt,
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/*out_quant_scale=*/std::nullopt,
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/*alibi_slope=*/std::nullopt,
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attn_metadata.attn_mask,
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attn_metadata.compute_dtype,
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block_aligned_max_seq_len,
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sliding_window_,
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/*window_size_right=*/-1,
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scale_,
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/*return_lse=*/false,
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attn_metadata.is_causal,
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/*kv_cache_quant_bit_size=*/-1);
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}
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} // namespace layer
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} // namespace xllm
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