ViperEkura
7feeb0b93e
- Add TensorLayout enum (C++ + Python) to replace magic layout ints - Add C10_CUDA_CHECK post-launch error checking to all kernel entries - Add CUDAGuard + freqs_cis shape validation to rotary_emb.cu - Cache SM count to eliminate per-call cudaDeviceGetAttribute - Add DISPATCH_CAUSAL_MASK macro to deduplicate dispatcher if/else - Convert mask type hints from X|None to Optional[X]
39 lines
1.2 KiB
Plaintext
39 lines
1.2 KiB
Plaintext
#include "attn_dispatchers.cuh"
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#include "attn_entry_utils.cuh"
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torch::Tensor attn_decode(
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torch::Tensor q,
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torch::Tensor k,
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torch::Tensor v,
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c10::optional<torch::Tensor> mask,
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int64_t causal_offset,
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double scale,
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int64_t layout
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) {
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AttentionParams<bf16> p;
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attn_pack_params(q, k, v, mask, causal_offset, scale, layout, p);
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TORCH_CHECK(p.q_len == 1, "Q seq_len must be 1");
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TORCH_CHECK(p.head_dim % 32 == 0, "head_dim must be multiple of 32");
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auto O = torch::empty_strided(q.sizes(), q.strides(), q.options());
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auto O_view = (layout == BLHD) ? O.transpose(1, 2) : O;
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p.o = (bf16*)O_view.data_ptr();
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alloc_split_partials(p);
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DISPATCH_HEAD_DIM(p.head_dim, dispatch_decode, p);
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C10_CUDA_CHECK(cudaGetLastError());
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return O;
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}
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PYBIND11_MODULE(TORCH_EXTENSION_NAME, m) {
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m.def("attn_decode", &attn_decode,
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py::arg("q"),
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py::arg("k"),
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py::arg("v"),
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py::arg("mask") = py::none(),
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py::arg("causal_offset") = -1,
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py::arg("scale") = 0.0,
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py::arg("layout") = (int64_t)BHLD,
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"GQA decode (tensor-core head-packing on sm_80+, scalar fallback)");
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}
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