ViperEkura
3067a8e1a6
- Add attention() functional entry delegating to active backend - GQA/MLA forward calls attention() instead of inline cache/SDPA - CUDA kernels support 2D/3D/4D mask via mask_h_stride field - CudaBackend.fwd_decode builds 2D padding mask for mixed seq_lens - KVCache.max_len precomputed in bind_tasks to avoid GPU sync - batch==1 decode short-circuits mask=None - Split tests into conftest, test_backend, test_backend_equivalence, test_kernel_mask - 440 tests pass, L20 decode 1.44-1.60x speedup vs torch native
72 lines
1.8 KiB
C++
72 lines
1.8 KiB
C++
#pragma once
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template<typename T, typename AT = float>
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struct AttentionParams {
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int batch;
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int q_head;
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int kv_head;
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int q_len;
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int kv_len;
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int head_dim;
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int use_mask;
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int causal_offset; // -1 = non-causal; >=0 = absolute position of first Q token
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int num_splits;
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float scale;
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// Q strides (element offsets for each dim — layout-agnostic)
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int q_stride_b, q_stride_h, q_stride_l, q_stride_d;
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// KV strides (K and V share the same layout — only base pointers differ)
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int kv_stride_b, kv_stride_h, kv_stride_l, kv_stride_d;
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// Mask: 2D [batch, kv_len], 3D [batch, q_len, kv_len],
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// or 4D [batch, n_heads, q_len, kv_len] (head dim broadcasts when stride=0)
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int mask_b_stride; // batch stride
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int mask_h_stride; // head stride (0 = broadcast across heads)
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int mask_q_stride; // q stride (0 = all q rows share)
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const T* __restrict__ q;
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const T* __restrict__ k;
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const T* __restrict__ v;
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const bool* __restrict__ mask;
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T* __restrict__ o;
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AT* __restrict__ o_part;
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AT* __restrict__ ml_part;
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};
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template<typename T, typename AT = float>
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struct PagedAttentionParams {
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int batch;
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int q_head;
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int kv_head;
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int q_len;
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int kv_len;
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int head_dim;
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int use_mask;
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int causal_offset;
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float scale;
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int num_splits;
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int page_size;
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int max_pages;
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// Q strides (layout-agnostic)
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int q_stride_b, q_stride_h, q_stride_l, q_stride_d;
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// Mask strides (2D, 3D, or 4D)
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int mask_b_stride;
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int mask_h_stride;
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int mask_q_stride;
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const T* __restrict__ q;
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const T* __restrict__ k_cache;
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const T* __restrict__ v_cache;
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const bool* __restrict__ mask;
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const int64_t* __restrict__ page_table;
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T* __restrict__ o;
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AT* __restrict__ o_part;
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AT* __restrict__ ml_part;
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};
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