ViperEkura/AstrAI
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21ddead23888e0f2e05d4fdc49965943b8a68b26
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5 Commits
Author SHA1 Message Date
ViperEkura 50cfd0d555 perf: reduce decode overhead in scheduler and executor 
- Precompute page_table and decode_mask on KVCache once per step in PagePool.bind_tasks, instead of per-layer in CudaBackend/TorchNativeBackend
- Skip frequency penalty history tensor construction when all penalties are 0 in Executor.execute_decode
- Omit FrequencyPenaltyStrategy from sampling pipeline when penalty is 0
- Deduplicate get_active_tasks calls in scheduler loop (3 to 1), remove redundant sorted() on decode tasks
- Benchmark (L20, bf16, CUDA backend): B=1 9.48->9.40ms (+1%), B=4 10.73->9.89ms (+8.6%), B=8 10.77->10.13ms (+6.4%)
 2026-07-31 14:50:16 +08:00
ViperEkura 3067a8e1a6 feat: unify attention backend with multi-dim mask support 
- 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
 2026-07-30 20:38:34 +08:00
ViperEkura 32fd03a025 feat: add CudaBackend and rename to fwd_decode/fwd_prefill 
- CudaBackend: paged decode via attn_paged_decode, prefill via attn_prefill
- Decode uses req_to_token as page_table with page_size=1
- Falls back to TorchNativeBackend when kernel unavailable
- Rename forward_decode/forward_extend to fwd_decode/fwd_prefill
- Register ATTN_BACKEND.CUDA in _BACKEND_REGISTRY
 2026-07-30 18:45:33 +08:00
ViperEkura 21bf37dd83 refactor: unify extension API to blhd layout and is_causal 
- Rename ops.py to attention_ops.py
- Remove layout/scale params: fixed blhd, auto scale
- Replace causal_offset with is_causal bool
- Move SDPA fallback to backend, ops only calls CUDA kernels
- Update __init__.py exports
 2026-07-30 18:39:20 +08:00
ViperEkura 5b67d5865a feat: add AttentionBackend ABC with context manager 
- AttentionBackend ABC with forward_decode/forward_extend dispatch
- TorchNativeBackend: SDPA with indirect KV cache gather
- attn_backend() context manager + ATTN_BACKEND enum (mirrors sdpa_kernel)
- ContextVar-based thread-safe backend switching
- get_backend() falls back to default TorchNativeBackend singleton
 2026-07-30 18:20:27 +08:00